DOCSLIB.ORG

By Voustapha Ibrahim Zeidan a THESIS Submitted to the School Of

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
By Voustapha Ibrahim Zeidan a THESIS Submitted to the School Of TUS INHERITANCE OF RESISTANCE TO ÜSTILAGO NUDA (JENS.) K. AND S ,, RACE I, IN BARLEY By Voustapha Ibrahim Zeidan A THESIS Submitted to the School of Graduate Studies of Michigan State College of Agriculture and Applied Science in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Department of Botany and Plant Pathology 195:3 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Tî-îE INHERITANCE OF RESISTANCE TO USTILAGO NUDA (JENS.) K. MID S . , RACE I , IN BARLEY By Houstapha Ibrahim Zeidan AN ABSTRACT Submitted to tbe School of Graduate Studies of Michigan State College of Agriculture and Applied Science in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Depatment of Botany and Plant Pathology 1953 Approved Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. ABSTRACT Barley has been knoiim for centuries as a cultivated plant used for making bread and as feed for animals. This crop is attacked by many diseases ’which become imnortant factors in decreasing yields. Loose smut caused by Ustilago nuda (Jens.) K. and S. is one of these diseases. Its control by the hot water treatment, modified hot water treatment and by organic compounds is unsatisfactory and hazardous. Consequently the use of resistant varieties is the effective method. The present investigation was concerned with the inheritance of resistance to Ustilago nuda (Jens.) K. and S., race I, the genetic con­ stitution of. the parental varieties and the relationship between factors for resistance and those for morphological characteristics. Four non-commercial varieties (Jet, Anoidium, Harlan, Ogalitsu) resistant to loose, smut disease were crossed into all possible combina­ tions: Jet X Harlan, Jet x Anoidium, Jet x Ogalitsu, Harlan x Ogalitsu, Harlan x Anoidium, and Ogalitsu x Anoidium. Jet has a two-rowed head, naked seeds, rough awns, a black lemma and pericarp. The others have six-rowed head, covered seeds, white lemma and pericarp. Harlan and Otalitsu have semi—smooth awns, while the awns of Anoidium are smooth. The florets of one or two heads of plants were inoculated. One or two drops of fresh snore suspension ’.vere introduced into each floret by means of the "needle" method. The classification of families which represented the Fg plants, into resistant, segregating and suscep­ tible groups was made according to the percentages of infection. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. The inheritance of resistance to Ustilago nuda (Jens.) K. and S., race I, in the crosses Jet x Harlan, Harlan x Ogalitsu, Ogalitsu x Anoidium, is explained by two gene pairs acting in duplicate dominant epistatic condition. The two genes were found to be different and independently inherited. Thus, each parent possesses one dominant gene pair for resistance. One gene difference was found between two-rowed vs. six—rowed head, covered vs. naked seeds, black vs. white lemma and pericarp in the hybrids of Jet x Harlan. Also, no linkage was found to exist between factors for resistance and those for the above mentioned moiphological characteristics. The inheritance of resistance in the cross Jet x Anoidium and Jet x Ogalitsu was not studied, because of the inadequate number of families. In the cross Harlan x Anoidium, the resistance was interpreted in terms of two gene pairs exhibiting dominant and recessive epistasis. The genes also were different and independently inherited. The expected ratio was 1^:1 but the observed ratio was 13:3. However, the excess of susceptible families could be interpreted by the occurrence of fluctuation in some genotypes, which might be due to a change in the expression of the resistance and the susceptibility. This change might be influenced by the environment. Thus, each parent also possessed one dominant gene. Four genes were found to govern the resistance in the four varieties used in this investigation. These genes were found to be different and to be independently inherited. There was no evidence of linkage between resistance and morphological characters. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. ACKNO'ArLEDGl\ffiMTS The author wishes to express bis sincere gratitude to Doctor John R. Vaughn and Doctor Kenneth J. Frey for their effective guidance and criticis'n in carrying out this investigation. He is also greatly indebted to Doctor Villia'n 3, Drew for his kind and valuable advice and criticisoi along the preparation of this ■oanuscript, The author wishes to thank Doctor Constantine J. Alexopoulos, Doctor Eldon E, Down and Doctor Jesse E, Muncie for their careful criticism of this thesis. Finally, he deeply appreciates the people of Lebanon for the financial help by which he was assisted in completing his training in the United States of America. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. TABLE OF CONTENTS I. INTRODUCTION................................................. 1 A. Economie importance of b a r l e y ............................ 1 B . Economie importance of the di s e a s e ................... 1 C . Practical control m e t h o d ......... 2 D. Objectives of the study ..................... 2 II. REVIEW OF L I T E R A T U R E ........................................... '3 A. History of loose smut organism Ustilago nuda (Jens.) K. and Srace I ........................................... 3 B. Inheritance of resistance to Ustilago nuda (Jens.) K. and S ...................................................... ^ C . Inheritance of agronomic characters........................ 7 1. Two-rowed vs. six—rowed heads .............. 7 2. Naked vs. covered s e e d s .......... 9 3. Rough awns vs. smooth awns , .........................10 U« Black lemma and pericarp vs. white lemma and pericarp . 11 D. Linkage studies .......... 11 E. Infection of hybrid progenies.............................. 12 III. MATERIALS AND T^ETHODS........................................... lU IV. EXPERIMENTAL RESULTS ........................................... 21 A. Study of the reaction of the parental varieties Jet, Anoidium, Harlan and Ogalitsu to loose smut infection . 21 B. 'Study of the inheritance of resistance in hybrids............21 1. Jet X H a r l a n ............ 21 2. Jet X Anoidium .........................................26 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. 3, Jet X Ogalitsu .................................... .. 28 h» Harlan x Ogalitsu.......................................28 5» Harlan x Anoidium.................................. 31 6. Ogalitsu X Anoidium.................................... 33 C. Study of the inheritance of agronomic c h a r a c t e r s ...........37 1. Two-rowed vs. six-rowed h e a d s .......................... 37 2 • Hulled vs. naked seeds ............................ UO 3. Rough awns vs. smooth awns ........................ Ul U. Black lemma and pericarp vs. white lemma and pericarp • U3 D* Study of the linkage r e l a t i o n s .............. ............ 1. Resistance vs. susceptibility with two—rowed vs. six-rowed h e a d s ....................................... 2. Resistance vs. susceptibility with hulled vs. naked seeds ............................................... U6 3. Resistance vs. susceptibility with black lemma and pericarp vs. white lemma and pericarp................ U7 V. SELECTION....................................................... k9 VI. DISCUSSION ..................................................... $0 VII. sumuiRY .......... 55 LITERATURE C I T E D ................................................... 57 APPENDIX ........................................................... 62 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. INTRODUCTION The barley crop has been known for centuries as a cultivated plant for making bread and as a feed for animals. In addition, it is also used today in nanufacturing items for human consumption: breakfast food, flour.and spiritous liquors. Barley is grown under a wide range of environmental conditions in many countries of Asia, Europe, as well as in the United States of America. In the United States, barley production is concentrated in the mid­ west states: North Dakota, Minnesota, South Dakota, Wisconsin, Michigan, Iowa, Illinois, and in the far west in California. It was reported that California was the leading barley producer in 19^1. Michigan during the same year produced 3,876,000 bushels of barley grain having a revenue of oU,692,000 which amount gives barley fourth rank after corn, wheat, and oats in crop income (1, 10, 39). It is true that barley does not occupy first place among the small grains but it is an important crop, especially for animal consumption. Barley can compete with oats for this purpose, and in many places in the United States barley is more profitable and produces more bushels per acre than oats. Besides these benefits, barley is used for breaking new soil (23). Its early maturation allows it to be cut before many other species which have mature seed. It is also used for old lands which have become too poor for producing good crops of wheat or com. ' Barley is affected by manj»" diseases which decrease its production quantitative!:/- and qualitatively. Important among these barley diseases are the smut
Load more

Recommended publications
  • Ustilago: Habitat, Symptoms and Reproduction | Teliomycetes
    Ustilago: Habitat, Symptoms and Reproduction | Teliomycetes For B.Sc. Botany 1st By Dr. Meenu Gupta Assistant Professor Botany J.D.W.C. Patna 1. Habit and Habitat of Ustilago: Ustilago, the largest genus of the family Ustilaginaceae is represented by more than 400 cosmopolitan species. Butler and Bisby (1958) reported 108 species from India. All species are parasitic and infect the floral parts of wheat, barley, oat, maize, sugarcane, Bajra, rye and wild grasses. The name Ustilago has been derived from a Latin word ustus meaning ‘burnt’ because the members of the genus produce black, sooty powdery mass of spores on the host plant parts imparting them a ‘burnt’ appearance. This black dusty mass of spores resembles soot or smut, therefore, commonly it is also known as smut fungus. The fungus is of much economic importance, because it causes heavy loss to various economically important plants. This genus is very common in U.P., Bihar, Punjab and Madhya Pradesh. 2. Symptoms of Ustilago: The symptoms appear only on the floral parts. The floral spikes turn black and remain filled with the smut spores. Ustilago produces two main types of symptoms: 1. The blackish powder of spores is easily blown away by the wind, leaving a bare stalk of inflorescence (Fig. 1 B). Species showing such symptoms are called loose smuts e.g., (a) Loose smut of oat caused by U. avenae (b) Loose smut of barley caused by U. nuda (c) Loose smut of wheat caused by U. nuda var. tritici. (Fig. 13A, B). (d) Loose smut of doob grass caused by U.
    [Show full text]
  • CONTROL of SMUT in WHEAT and OTHER SMALL GRAINS by H
    Bulletin No. 116 June, 1931 Montana State College, Extension Service, J. C. Taylor, Director, Cooperative Extension Work in Agriculture and Home Economics. Montana State College and Uni~ed States Department of Agriculture, co-operating. Distributed in furtherance of the Acts of Congress ~ay 8 and June 30, 1.914. ~ CONTROL OF SMUT IN WHEAT AND OTHER SMALL GRAINS By H. E. Morris, Extension Plant Pathologist Waldo Kidder, Extension Agronomist Smuts cost the farmers of Montana many thousands of dollars each year. In 1930, stinking smut of wheat alone caused a loss of approximately $750;000, due to decreased yields and to a lower price per bushel. This loss and also that due to the smuts {..:Fig. 1. Smutted and normal heads of wheat. The head at the left ,is a typi:cal head affected with covered or stinking smut, The next, head IS a he'althy head. The two heads on the right show two stages of the loose smut in wheat. (-Courtesy,D. S. Dept. of Agr.) . ,( 2 MONTANA EXTENSION SERVICE of oats, barley and rye may be largely prevented by adopting the methods of seed treatment described in this bulletin. What Is Smut Smut is produced by a small parasitic plant, mould-like in appearance, belonging to a group called fungi (Fig. 2). Smut lives most of its life within and at the expense of the wheat plant. The smut powder, so familiar to all, is composed of myriads of spores which correspond to seeds in the higher plants. In the process of harvesting and threshing, these spores are dis· I Fig'.
    [Show full text]
  • The History, Fungal Biodiversity, Conservation, and Future Volume 1 · No
    IMA FungUs · vOlume 1 · no 2: 123–142 The history, fungal biodiversity, conservation, and future ARTICLE perspectives for mycology in Egypt Ahmed M. Abdel-Azeem Botany Department, Faculty of Science, University of Suez Canal, Ismailia 41522, Egypt; e-mail: [email protected] Abstract: Records of Egyptian fungi, including lichenized fungi, are scattered through a wide array Key words: of journals, books, and dissertations, but preliminary annotated checklists and compilations are not checklist all readily available. This review documents the known available sources and compiles data for more distribution than 197 years of Egyptian mycology. Species richness is analysed numerically with respect to the fungal diversity systematic position and ecology. Values of relative species richness of different systematic and lichens ecological groups in Egypt compared to values of the same groups worldwide, show that our knowledge mycobiota of Egyptian fungi is fragmentary, especially for certain systematic and ecological groups such as species numbers Agaricales, Glomeromycota, and lichenized, nematode-trapping, entomopathogenic, marine, aquatic and coprophilous fungi, and also yeasts. Certain groups have never been studied in Egypt, such as Trichomycetes and black yeasts. By screening available sources of information, it was possible to delineate 2281 taxa belonging to 755 genera of fungi, including 57 myxomycete species as known from Egypt. Only 105 taxa new to science have been described from Egypt, one belonging to Chytridiomycota, 47 to Ascomycota, 55 to anamorphic fungi and one to Basidiomycota. Article info: Submitted: 10 August 2010; Accepted: 30 October 2010; Published: 10 November 2010. INTRODUCTION which is currently accepted as a working figure although recognized as conservative (Hawksworth 2001).
    [Show full text]
  • Common Diseases of Small Grains and Their Management
    Common Diseases of Small Grains and Their Management Gary C. Bergstrom Cornell University Section of Plant Pathology and Plant-Microbe Biology Central New York Small Grains Workshop February 3, 2015 West Winfield, NY Plant Disease: A condition of a plant of abnormal growth or function Plant Pathogen: A living organism that can incite plant disease Gary C. Bergstrom, Cornell University When a microbe feeds on a: It is called a: Living host parasite Non-living host saprophyte When a pathogen: It is called a: Gets its nutrients from biotroph living cells Kills host cells before necrotroph acquiring nutrients Gary C. Bergstrom, Cornell University Causal agents (pathogens) of infectious plant diseases • FUNGUS • OOMYCETE • BACTERIUM • VIRUS • NEMATODE Gary C. Bergstrom, Cornell University Factors affecting disease epidemiology and management • Pathogen dissemination potential – (long-distance, regional, local) • Survival in debris • Vector relationship • Favorable environment Gary C. Bergstrom, Cornell University Methods of disease management • Cultural (e.g., crop rotation) • Resistance (e.g., resistant or tolerant varieties) • Biological (e.g., biopesticides) • Chemical (e.g., fungicide seed treatment) • Regulatory (e.g., seed certification) Gary C. Bergstrom, Cornell University Yellow dwarf of cereals and grasses Gary C. Bergstrom, Cornell University Yellow dwarf of cereals and grasses • Pathogen: Barley yellow dwarf luteovirus and Cereal yellow dwarf polerovirus strains • Host range: all grasses • Symptoms: leaves yellow to red or purple; stunting • Conditions: early planting; large aphid populations • Survival: in infected aphids and grasses • Spread: by aphids (short & long distance) • Management:plant after Hessian fly free date, systemic seed insecticides Gary C. Bergstrom, Cornell University Soilborne viruses © G.C. Bergstrom Gary C.
    [Show full text]
  • Control of Loose Smut of Barley Richard Mullington Lewis Iowa State University
    Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1962 Control of loose smut of barley Richard Mullington Lewis Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Agriculture Commons, and the Plant Pathology Commons Recommended Citation Lewis, Richard Mullington, "Control of loose smut of barley " (1962). Retrospective Theses and Dissertations. 2102. https://lib.dr.iastate.edu/rtd/2102 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. This dissertation has been 63-1587 microfilmed exactly as received LEWIS, Richard Mullington, 1920- CONTROL OF LOOSE SMUT OF BARLEY. Iowa State University of Science and Technology Ph.D., 1962 Agriculture, plant pathology University Microfilms, Inc., Ann Arbor, Michigan CONTROL OF LOOSE SMUT OF BARLEY by Richard Mullington Lewis A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subject: Plant Pathology Approved: Signature was redacted for privacy. In Charge of Major Signature was redacted for privacy. Head of Major D rtment Signature was redacted for privacy. D^ân of Grad lollege Iowa State University Of Science and Technology Ames, Iowa 1962 ii TABLE OF CONTENTS Page INTRODUCTION 1 PERTINENT LITERATURE 3 MATERIALS AND METHODS 6 Materials 6 Methods of Application 7 Seed Treatment Evaluations 12 EXPERIMENTAL RESULTS 15 1952 Results 15 1953 Results 18 195m- Results 24 1955 Results 39 DISCUSSION 41 SUMMARY AND CONCLUSIONS 48 LITERATURE CITED 51 ACKNOWLEDGEMENTS 53 APPENDIX 54 iii LIST OF TABLES Page Table 1.
    [Show full text]
  • Topic – Loose Smut of Wheat
    Course – M. Sc. Botany Part 1 Paper III Topic – Loose Smut of Wheat Prepared by – Dr. Santwana Rani Coordinated by – Prof. (Dr.) Shyam Nandan Prasad Loose Smut of Wheat ➢ The disease loose smut of wheat is caused by ustilago nuda tritici. ➢ Incidence is more in north than in south India. ➢ Country wide loss is about 2-3%of total yield. ➢ There was a loose smut epidemic in Punjab, Haryana and western U.P. in 1970-75. Distribution: ➢ All wheat growing regions of India. ➢ Particularly in Punjab, Haryana, U.P. and certain regions of M.P. Symptoms: ➢ Symptoms appear after ear emergence. ➢ Diseased ear emerged first than normal in some varieties ➢ Mostly all ears is converted into a black mass of spores ➢ All the floral parts of the head, except the rachis and pericarp membrane, are invaded by mycelium of the fungus and converted into loose aggregation of smut spores(teliospores). ➢ Significant reduction in tillering. ➢ Except awns all parts of ear converted into smut spore. ➢ Black powder in ear-covered by slivery membrane. ➢ Membrane burst later & smut spore release. ➢ Group of smut spore called sorus. ➢ High respiration and low dry weight. Causal agent: Etiology Pathogen - Ustilago nuda tritici. (Syn. U. segetum var. tritici) Systematic position: Kingdom: Fungi Phylum: Basidiomycota Sub phylum: Ustilaginomycotina Class: Ustilaginomycetes Order: Ustilaginales Family: Ustilaginaceae Genus: Ustilago Species: U tritici (Pers.) Pathogen characters: ➢ It is an internally seed borne fungal disease. ➢ It causes systemic infection. ➢ The teliospores of the fungus are pale, olive brown, spherical to oval in shape, about 5-9 micro diameter and are adorned with minute echinulations on the wall.
    [Show full text]
  • Iodiversity of Australian Smut Fungi
    Fungal Diversity iodiversity of Australian smut fungi R.G. Shivas'* and K. Vanky2 'Queensland Department of Primary Industries, Plant Pathology Herbarium, 80 Meiers Road, Indooroopilly, Queensland 4068, Australia 2 Herbarium Ustilaginales Vanky, Gabriel-Biel-Str. 5, D-72076 Tiibingen, Germany Shivas, R.G. and Vanky, K. (2003). Biodiversity of Australian smut fungi. Fungal Diversity 13 :137-152. There are about 250 species of smut fungi known from Australia of which 95 are endemic. Fourteen of these endemic species were first collected in the period culminating with the publication of Daniel McAlpine's revision of Australian smut fungi in 1910. Of the 68 species treated by McAlpine, 10 were considered to be endemic to Australia at that time. Only 23 of the species treated by McAlpine have names that are currently accepted. During the following eighty years until 1990, a further 31 endemic species were collected and just 11 of these were named and described in that period. Since 1990, 50 further species of endemic smut fungi have been collected and named in Australia. There are 115 species that are restricted to either Australia or to Australia and the neighbouring countries of Indonesia, New Zealand, Papua New Guinea and the Philippines . These 115 endemic species occur in 24 genera, namely Anthracoidea (1 species), Bauerago (1), Cintractia (3), Dermatosorus (1), Entyloma (3), Farysporium (1), Fulvisporium (1), Heterotolyposporium (1), Lundquistia (1), Macalpinomyces (4), Microbotryum (2), Moreaua (20), Pseudotracya (1), Restiosporium (5), Sporisorium (26), Thecaphora (2), Tilletia (12), Tolyposporella (1), Tranzscheliella (1), Urocystis (2), Ustanciosporium (1), Ustilago (22), Websdanea (1) and Yelsemia (2). About a half of these local and regional endemic species occur on grasses and a quarter on sedges.
    [Show full text]
  • Comparative Analysis of the Maize Smut Fungi Ustilago Maydis and Sporisorium Reilianum
    Comparative Analysis of the Maize Smut Fungi Ustilago maydis and Sporisorium reilianum Dissertation zur Erlangung des Doktorgrades der Naturwissenschaften (Dr. rer. nat.) dem Fachbereich Biologie der Philipps-Universität Marburg vorgelegt von Bernadette Heinze aus Johannesburg Marburg / Lahn 2009 Vom Fachbereich Biologie der Philipps-Universität Marburg als Dissertation angenommen am: Erstgutachterin: Prof. Dr. Regine Kahmann Zweitgutachter: Prof. Dr. Michael Bölker Tag der mündlichen Prüfung: Die Untersuchungen zur vorliegenden Arbeit wurden von März 2003 bis April 2007 am Max-Planck-Institut für Terrestrische Mikrobiologie in der Abteilung Organismische Interaktionen unter Betreuung von Dr. Jan Schirawski durchgeführt. Teile dieser Arbeit sind veröffentlicht in : Schirawski J, Heinze B, Wagenknecht M, Kahmann R . 2005. Mating type loci of Sporisorium reilianum : Novel pattern with three a and multiple b specificities. Eukaryotic Cell 4:1317-27 Reinecke G, Heinze B, Schirawski J, Büttner H, Kahmann R and Basse C . 2008. Indole-3-acetic acid (IAA) biosynthesis in the smut fungus Ustilago maydis and its relevance for increased IAA levels in infected tissue and host tumour formation. Molecular Plant Pathology 9(3): 339-355. Erklärung Erklärung Ich versichere, dass ich meine Dissertation mit dem Titel ”Comparative analysis of the maize smut fungi Ustilago maydis and Sporisorium reilianum “ selbständig, ohne unerlaubte Hilfe angefertigt und mich dabei keiner anderen als der von mir ausdrücklich bezeichneten Quellen und Hilfen bedient habe. Diese Dissertation wurde in der jetzigen oder einer ähnlichen Form noch bei keiner anderen Hochschule eingereicht und hat noch keinen sonstigen Prüfungszwecken gedient. Ort, Datum Bernadette Heinze In memory of my fathers Jerry Goodman and Christian Heinze. “Every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving.
    [Show full text]
  • Loose Smut and Common Bunt of Wheat Stephen N
    ® ® KFSBOPFQVLCB?O>PH>¨ FK@LIKUQBKPFLK KPQFQRQBLCDOF@RIQROB>KA>QRO>IBPLRO@BP KLTELT KLTKLT G1978 Loose Smut and Common Bunt of Wheat Stephen N. Wegulo, Extension Plant Pathologist loss from loose smut is usually minimal (about 1 percent or Loose smut and common bunt are fungal diseases less). However, the disease can cause losses as high as 25 common to wheat in Nebraska. Planting resistant cul- percent or more in severe cases. In general, percent yield loss tivars and fungicide-treated seed will help with control from loose smut is approximately equal to the percentage of and management. affected wheat heads. Common bunt reduces both grain quality and yield. Grain contaminated by bunt spores has a darkened appearance and a Cause and Occurrence fishy, pungent smell. The smell is due to an organic compound, trimethylamine, which in appropriate concentrations can The smut diseases of wheat that occur in Nebraska are cause explosions in combines during harvest or in elevators loose smut (Figure 1) and common bunt (stinking smut, during storage. Contaminated grain usually is discounted at Figure 2). Loose smut is caused by the fungus Ustilago the elevator and can be rejected altogether. It cannot be used tritici and common bunt is caused by the fungi Tilletia tritici as feed because the strong order causes livestock to reject it. and T. laevis. Both diseases can occur anywhere in the state However, it may be used in ethanol production. where wheat is grown and are noticeable from heading to harvest. Rye, triticale, and some grasses also can be affected Disease Symptoms by both diseases.
    [Show full text]
  • Bulletin #1016, Loose Smut of Barley and Oats
    Bulletin #1016 Loose Smut of Barley and Oats By Steven B. Johnson, Extension crops specialist, University of Maine Cooperative Extension oose smut of barley is caused by the fungus higher prevalence where seed treatments are not Ustilago nuda and occurs virtually everywhere used and can be rather conspicuous in the field. As L barley is grown. Loose smut of oats is caused the seed is replaced by the fungus, yield loss is by the related pathogen Ustilago avenae and occurs proportional to the percentage of smutted heads. virtually everywhere oats are grown. Other species of Ustilago attack wheat, corn, and other grasses. Biology Infected seed kernels are converted into black spores that are visible on the seed heads, giving the disease The loose smut fungus is seed-borne and survives the common name of loose smut. The pathogen is from season to season within the embryo of the seed. transmitted through infected seeds. Loose smut can As the seed germinates, the loose smut fungus be one of the most destructive diseases of barley and activates and infects the developing seedling, where oats. While the use of seed treatments containing a it continues to grow within the plant until flowers fungicide has made the disease manageable, loose start to form. At that time, the loose smut fungus smut is still present and a threat. The disease has a replaces the seed with black powdery spores. Heads Smutted head in the field. Completely smutted heads at harvest. Photo by Steven B. Johnson. Photo by Steven B. Johnson. of small grains infected with the loose smut Management pathogen—in which the grain has been completely l Use certified seed, as infected seed is the source of replaced by the smut fungus— generally emerge inoculum.
    [Show full text]
  • Inheritance of Resistance to Loose Smut Ustilago Tritici of Wheat
    id25503277 pdfMachine by Broadgun Software - a great PDF writer! - a great PDF creator! - http://www.pdfmachine.com http://www.broadgun.com ISSN : 0974 - 7532 Volume 10 Issue 4 Research & Reviews in BBiiooSScciieenncceess Review RRBS, 10(4), 2015 [137-146] Inheritance of resistance to loose smut ustilago tritici of wheat Reda Helmy Sammour1*, Mostafa Mahmoud El Shamy2, Abd El-Zaher M.A. Mustafa1, Enas Said Yousef El-Refaay2 1Botany Department, Faculty of Science, Tanta University, (TANTA) 2Gemmeiza Agriculture Research, Gemmeiza, Agricultural Research Center, El-Giza, (EGYPT) E-mail: [email protected] ABSTRACT Ustilago tritici, the causal agent of loose smut of wheat (Triticum aestivum L), belongs to family Ustilaginaceae. In nature, infection by Ustilago segetum var. tritici is organ specific i.e. via the ovary, and it is possible only during the relatively short period of flowering of the host. In the field, there are two methods of inoculation; dry method and wetable method. An extensive work has been done in many countries of the world for identifying sources of resistance to that disease, since breeding for resistance may be one of the most effective methods for controlling the disease. Loose smut causes a reduction in agronomic charactesrs. Yield is an ultimate product of the action and interaction of a number of quantitative characters, which are known to be controlled by different sets of polygenes. Therefore, ombining ability studies are used by plant breeders to select parents with maximum potential of transmitting desirable genes to the progenies. The estimation of combining ability is very useful because the variance due to general combining ability is attributed to additive gene action, while the variance due to specific combining ability is attributed to non-additive gene action.
    [Show full text]
  • Objective Plant Pathology
    See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/305442822 Objective plant pathology Book · July 2013 CITATIONS READS 0 34,711 3 authors: Surendra Nath M. Gurivi Reddy Tamil Nadu Agricultural University Acharya N G Ranga Agricultural University 5 PUBLICATIONS 2 CITATIONS 15 PUBLICATIONS 11 CITATIONS SEE PROFILE SEE PROFILE Prabhukarthikeyan S. R ICAR - National Rice Research Institute, Cuttack 48 PUBLICATIONS 108 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Management of rice diseases View project Identification and characterization of phytoplasma View project All content following this page was uploaded by Surendra Nath on 20 July 2016. The user has requested enhancement of the downloaded file. Objective Plant Pathology (A competitive examination guide)- As per Indian examination pattern M. Gurivi Reddy, M.Sc. (Plant Pathology), TNAU, Coimbatore S.R. Prabhukarthikeyan, M.Sc (Plant Pathology), TNAU, Coimbatore R. Surendranath, M. Sc (Horticulture), TNAU, Coimbatore INDIA A.E. Publications No. 10. Sundaram Street-1, P.N.Pudur, Coimbatore-641003 2013 First Edition: 2013 © Reserved with authors, 2013 ISBN: 978-81972-22-9 Price: Rs. 120/- PREFACE The so called book Objective Plant Pathology is compiled by collecting and digesting the pertinent information published in various books and review papers to assist graduate and postgraduate students for various competitive examinations like JRF, NET, ARS conducted by ICAR. It is mainly helpful for students for getting an in-depth knowledge in plant pathology. The book combines the basic concepts and terminology in Mycology, Bacteriology, Virology and other applied aspects.
    [Show full text]