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Avocado Production in Home Gardens Revised
AVOCADO PRODUCTION IN HOME GARDENS Author: Gary S. Bender, Ph.D. UCCE Farm Advisor Avocados are grown in home Soil Requirements gardens in the coastal zone of A fine sandy loam with good California from San Diego north drainage is necessary for long life to San Luis Obispo. Avocados and good health of the tree. It is (mostly Mexican varieties) can better to have deep soils, but also be grown in the Monterey – well-drained shallow soils are Watsonville region, in the San suitable if irrigation is frequent. Francisco bay area, and in the Clay soils, or shallow soils with “banana-belts” in the San Joaquin impermeable subsoils, should not Valley. Avocados are grown successfully in be planted to avocados. Mulching avocados frost-free inland valleys in San Diego County with a composted greenwaste (predominantly and western Riverside County, but attention chipped wood) is highly beneficial, but should be made to locating the avocado tree manures and mushroom composts are usually on the warmest microclimates on the too high in salts and ammonia and can lead to property. excessive root burn and “tip-burn” in the leaves. Manures should never be added to Climatic Requirements the soil back-fill when planting a tree. The Guatemalan races of avocado (includes varieties such as Nabal and Reed) are more Varieties frost-tender. The Hass variety (a Guatemalan/ The most popular variety in the coastal areas Mexican hybrid which is mostly Guatemalan) is Hass. The peel texture is pebbly, peel is also very frost tender; damage occurs to the color is at ripening, and it has excellent flavor fruit if the winter temperature remains at 30°F and peeling qualities. -
Avocado Carbohydrate Fluctuations. II. Fruit Growth and Ripening
J. AMER. SOC. HORT. SCI. 124(6):676–681. 1999. ‘Hass’ Avocado Carbohydrate Fluctuations. II. Fruit Growth and Ripening Xuan Liu, Paul W. Robinson, Monica A. Madore, Guy W. Witney,1 and Mary Lu Arpaia2 Department of Botany and Plant Sciences, University of California, Riverside, CA 92521 ADDITIONAL INDEX WORDS. ‘Hass’ avocado, ‘Duke 7’ rootstock, D-mannoheptulose, Persea americana, perseitol, soluble sugar, starch ABSTRACT. Changes in soluble sugar and starch reserves in avocado (Persea americana Mill. on ‘Duke 7’ rootstock) fruit were followed during growth and development and during low temperature storage and ripening. During the period of rapid fruit size expansion, soluble sugars accounted for most of the increase in fruit tissue biomass (peel: 17% to 22%, flesh: 40% to 44%, seed: 32% to 41% of the dry weight). More than half of the fruit total soluble sugars (TSS) was comprised of the seven carbon (C7) heptose sugar, D-mannoheptulose, and its polyol form, perseitol, with the balance being accounted for by the more common hexose sugars, glucose and fructose. Sugar content in the flesh tissues declined sharply as oil accumulation commenced. TSS declines in the seed were accompanied by a large accumulation of starch (≈30% of the dry weight). During postharvest storage at 1 or 5 °C, TSS in peel and flesh tissues declined slowly over the storage period. Substantial decreases in TSS, and especially in the C7 sugars, was observed in peel and flesh tissues during fruit ripening. These results suggest that the C7 sugars play an important role, not only in metabolic processes associated with fruit development, but also in respiratory processes associated with postharvest physiology and fruit ripening. -
Postulated Physiological Roles of the Seven-Carbon Sugars, Mannoheptulose, and Perseitol in Avocado
J. AMER. SOC. HORT. SCI. 127(1):108–114. 2002. Postulated Physiological Roles of the Seven-carbon Sugars, Mannoheptulose, and Perseitol in Avocado Xuan Liu,1 James Sievert, Mary Lu Arpaia, and Monica A. Madore2 Department of Botany and Plant Sciences, University of California, Riverside, CA 92521 ADDITIONAL INDEX WORDS. ‘Hass’ avocado on ‘Duke 7’ rootstock, phloem transport, ripening, Lauraceae ABSTRACT. Avocado (Persea americana Mill.) tissues contain high levels of the seven-carbon (C7) ketosugar mannoheptulose and its polyol form, perseitol. Radiolabeling of intact leaves of ‘Hass’ avocado on ‘Duke 7’ rootstock indicated that both perseitol and mannoheptulose are not only primary products of photosynthetic CO2 fixation but are also exported in the phloem. In cell-free extracts from mature source leaves, formation of the C7 backbone occurred by condensation of a three-carbon metabolite (dihydroxyacetone-P) with a four-carbon metabolite (erythrose-4-P) to form sedoheptulose-1,7- bis-P, followed by isomerization to a phosphorylated D-mannoheptulose derivative. A transketolase reaction was also observed which converted five-carbon metabolites (ribose-5-P and xylulose-5-P) to form the C7 metabolite, sedoheptu- lose-7-P, but this compound was not metabolized further to mannoheptulose. This suggests that C7 sugars are formed from the Calvin Cycle, not oxidative pentose phosphate pathway, reactions in avocado leaves. In avocado fruit, C7 sugars were present in substantial quantities and the normal ripening processes (fruit softening, ethylene production, and climacteric respiration rise), which occurs several days after the fruit is picked, did not occur until levels of C7 sugars dropped below an apparent threshold concentration of ≈20 mg·g–1 fresh weight. -
Divaricating Plants in New Zealand in Relation to Moa Browsing
GREENWOOD AND ATKINSON: DIYARICATING PLANTS AND MOA BROWSING 21 EVOLUTION OF DIVARICATING PLANTS IN NEW ZEALAND IN RELATION TO MOA BROWSING R. M. GREENWOOD' and I. A. E. ATKINSON' SUMMAR Y: New Zealand appears to be the only country where spineless, small-leaved divaricating plants make up nearly 10% of the woody flora. Climatic explanations have been advanced to &ccount for the origin of these divaricating plants. We suggest that the divergent and interl~ced branching, the woody exterior and the tough stems of these plants are adaptations evolved in response to browsing by moas. Together with a few species of much smaHer birds, moas were the only browsing vertebrates in New Zealand prior to the arrival of man. Thq divaricate habit is probably only one of several strategies evolved by plants in response to moa browsing. However, because fioas fed in a different way from mammals there is little to support the idea that introduced browsing mammals have merely replaced moas as aQ ecological factor in New Zealand. MORPHOLOGICAL FEATURES OF NEW ZEALAND difficult. The most helpful keys are those of Bulmer DIY ARICATING fLANTS (1958) and Taylor (1961), which deal specifioolly The term Hdivaricating", indicating branching at with these plants. New Zealand species found in this a wide angle, is used in New Zealand to describe the investigation to be capable of divaricating are listed many species of small-leaved woody shrubs that in Table 1. In cases where there was difficulty in have closely interlaced bra,nches. Some are the deciding whether a species should be included in juvenile stages of trees that lose the divaricate habit the table the criteria used for inclusion were (i) as they grow taUer. -
Revitalization and Social Change: Contributions from Psychiatric Epidemiology
DOCUMENT RESUME ED 115 574 SO 008 808 AUTHOR Foulks, Edward F. TITLE Revitalization and Social Change: Contributions from Psychiatric Epidemiology. PUB DATE 75. NOTE 14p.; Paper presented at the, Annual Meeting of the American Anthropological Association (San Francisco, California, December 1975) EDRS PRICE MF-$0.76 HC-$1.58 Plus Postage DESCRIPTORS Behavior Patterns; *Change Agents; Culture Conflict; Literature Reviews; *Mental Illness; Psychology; *Schizophrenia; *Social Change; Social Influences; *Social Psychology; Social Science Research; Sociocultural Patterns ABSTRACT The relationship between schizophrenia and social change is examined through a review of recent medical research' in genetics, biology, and epidemiology. Those mental traits that today in our society characterize the schizoprenic, in a previous era or in another society may have provided a mechanism for cultural change during the periods of stress when traditional methods of coping with the environment proved unadaptive. In many cases, prophets, shamens, and seers experience the same estrangement and disorganization of the self =as does the schizophrenic" in our society. This perspective views schizOphrenia in our society as an evolutionary anachronism which in a previous society may have been organized early in youth and shaped into a socially useful form. Cultural change has in recent human history become a dominating ethos and is accordingly valued for its- own sake. The particular psychological functions of these sensitive individuals are therefore no longer used to transcend traditional points of view. (Author/DE) ************************************************#********************** Documents acquired by ERIC include many informal unpublished * materials not available from other sources. EPIC makes every effort * * to obtain the best copy available. Nevertheless, items of marginal * * .reproducibility are often encountered and this affects the quality * * of the microfiche and hardcopy reproductions ERIC makes available * via the ERIC Document Reproduction Service (EDRS). -
Rapid Determination of Nutrient Concentrations in Hass Avocado Fruit by Vis/NIR Hyperspectral Imaging of Flesh Or Skin
remote sensing Article Rapid Determination of Nutrient Concentrations in Hass Avocado Fruit by Vis/NIR Hyperspectral Imaging of Flesh or Skin Wiebke Kämper 1,2,* , Stephen J. Trueman 1,2, Iman Tahmasbian 3 and Shahla Hosseini Bai 1 1 Environmental Futures Research Institute, School of Environment and Science, Griffith University, Nathan, QLD 4111, Australia; s.trueman@griffith.edu.au (S.J.T.); s.hosseini-bai@griffith.edu.au (S.H.B.) 2 Genecology Research Centre, University of the Sunshine Coast, Maroochydore DC, QLD 4558, Australia 3 Department of Agriculture and Fisheries, Queensland Government, Toowoomba, QLD 4350, Australia; [email protected] * Correspondence: w.kaemper@griffith.edu.au Received: 26 August 2020; Accepted: 14 October 2020; Published: 17 October 2020 Abstract: Fatty acid composition and mineral nutrient concentrations can affect the nutritional and postharvest properties of fruit and so assessing the chemistry of fresh produce is important for guaranteeing consistent quality throughout the value chain. Current laboratory methods for assessing fruit quality are time-consuming and often destructive. Non-destructive technologies are emerging that predict fruit quality and can minimise postharvest losses, but it may be difficult to develop such technologies for fruit with thick skin. This study aimed to develop laboratory-based hyperspectral imaging methods (400–1000 nm) for predicting proportions of six fatty acids, ratios of saturated and unsaturated fatty acids, and the concentrations of 14 mineral nutrients in Hass avocado fruit from 219 flesh and 194 skin images. Partial least squares regression (PLSR) models predicted the ratio of unsaturated to saturated fatty acids in avocado fruit from both flesh images (R2 = 0.79, ratio of prediction to deviation (RPD) = 2.06) and skin images (R2 = 0.62, RPD = 1.48). -
Summary Report: Whole Fresh Avocados
FY 2014 – 2016 Microbiological Sampling Assignment Summary Report: Whole Fresh Avocados Office of Compliance Center for Food Safety and Applied Nutrition December 2018 CONTENTS EXECUTIVE SUMMARY ........................................................................................................................................... 3 BACKGROUND ....................................................................................................................................................... 5 OBJECTIVES ............................................................................................................................................................ 7 SAMPLE COLLECTION ............................................................................................................................................. 7 PATHOGEN FINDINGS .......................................................................................................................................... 10 Pathogen Findings: Salmonella ........................................................................................................................ 10 Pathogen Findings: Listeria monocytogenes (Pulp Samples) ............................................................................ 11 Pathogen Findings: Listeria monocytogenes (Skin Samples) ............................................................................ 11 Pathogen Findings: By Country of Origin ........................................................................................................ -
Ecological and Genetic Analysis of Plant-Animal Interactions in Mediterranean Environments
UNIVERSIDAD DE MURCIA ESCUELA INTERNACIONAL DE DOCTORADO Ecological and Genetic Analysis of Plant-Animal Interactions in Mediterranean Environments Análisis Ecológico y Genético de Interacciones Planta-Animal en Ambientes Mediterráneos D. Vicente Martínez López 2018 Ecological and genetic analysis of plant-animal interactions in Mediterranean environments Análisis ecológico y genético de interacciones planta-animal en ambientes mediterráneos Tesis Doctoral Vicente Martínez López 2018 Escuela Internacional de Doctorado de la Universidad de Murcia (EIDUM) Universidad de Murcia Directores: Dra. Mª Pilar De la Rúa Tarín Dr. Francisco Robledano Aymerich Con el apoyo de (support): Esta tesis ha sido realizada en los Departamentos de Zoología y Antropología Física y Ecología e Hidrología de la Universidad de Murcia bajo de dirección de los doctores Mª Pilar De la Rúa Tarín y Francisco Robledano Aymerich. El autor ha sido beneficiario de un Contrato Predoctoral para la Formación del Profesorado Universitario (FPU) del Ministerio de Educación, Cultura y Deporte (referencia FPU 13/05115). Además ha realizado dos estancias predoctorales de tres meses de duración cada una financiada también por el Ministerio de Educación, Cultura y Deporte en régimen de concurrencia competitiva en la Universidad de Marburg (Alemania), supervisado por la Dra. Nina Farwig, y en CIBIO/InBIO (Universidad de Oporto, Portugal), supervisado por la Dra. Cristina García. Las investigaciones realizadas en el presente trabajo han recibido financiación de los proyectos de la -
Morristown Street Tree Resource Booklet
Morristown Street Tree Resource Booklet June 2020 I. Large Shade Trees for Areas Larger than 4’ x 6’ 3 Black Tupelo (Nyssa sylcatica) 4 Dawn Redwood (Metasequoia glyptostroboides) 5 Elm (Ulmus spp.) 6 Gingko (Gingko biloba) 7 Hardy Rubber Tree (Eucommia ulmoides) 8 Honey Locust (Gleditsia triacanthos inermis) 9 Katsura Tree (Cercidphyllum japonicum) 10 Kentucky Coffee Tree (Gymnocladus dioicus) 11 Linden (Tilia spp) 12 Little Leaf Linden (Tilia cordata) 13 Silver Linden (Tilia tomentosa) 14 Crimean Linden (Tilia x euchlora) 15 London Plane Tree (Platanus x acerfolia) 16 Maple, Red (Acer rubrum) 17 Maple, Sugar ( Acer saccharum) 18 Oak, Pin (Quercus palustris) 19 Oak, Red (Quercus rubra) 20 Oak, Shingle (Quercus imbricaria) 21 Oak, White (Quercus alba) 22 Oak, Willow (Quercus phellos) 23 Pagoda Tree (Styphnolobium japanicum) 24 Sweetgum (Liquidambur styraciflua) 25 Japanese Zelkova (Zelkova serrata) 26 II. Understory Small and Medium Trees for Areas Larger than 2’ x 6’ 27 American Yellowwood (Cladrastis kentukea) 28 Amur Maackia (Maackia amurensis) 29 Cherry (Prunus spp) 30 Crabapple (Malus spp) 31 Dogwood (Cornus spp) 32 Eastern Rudbud (Cercis canadensis) 33 Golden Raintree (Koelreuteria paniculata) 34 Hackberry (Celtis occidentalis) 35 Hawthorne (Crataegus spp) 36 Hop Hornbeam (Ostrya virginiana) 37 Japanese Snowball (Styrax japonicas) 38 Maple Amur (Acer ginnala ‘Flame’) 39 Maple, Hedge (Acer campestre) 40 Purpleleaf Plum (Prunus cerasifera) 41 Callery Pear (Pyrus calleryanan’) 42 I. Large Shade Trees for Areas Larger than 4’ x 6’ Black Tupelo (Nyssa sylcatica) Form: Pyramidal in youth with horizontal branches forming, and rounded or irregular crown. Mature Height: 30’ to 50’ Mature Spread: 20’ to 30’ Use: Acceptable street tree. -
Plant Structural Defences Against Browsing Birds: a Legacy of New Zealand’S Extinct Moas
OIKOS 104: 500Á/508, 2004 Plant structural defences against browsing birds: a legacy of New Zealand’s extinct moas William J. Bond, William G. Lee and Joseph M. Craine Bond, W. J., Lee, W. G. and Craine, J. M. 2004. Plant structural defences against browsing birds: a legacy of New Zealand’s extinct moas. Á/ Oikos 104: 500Á/508. Browsing by large vertebrates has been a major force in the evolution of terrestrial plants but Holocene extinctions of the browsers have left a legacy of broken biotic partnerships. Ratite birds were the largest herbivores in several regions, such as the moas of New Zealand. Many woody plants there have a distinct form of branching, described as ‘‘divaricate’’, with thin, wide angled, branches intertwining to form a tangled canopy. Divaricate branching has been interpreted as a form of protection against climate extremes or as an anachronistic defense against the extinct moas. Here we report the first experimental evidence that many of these plants are defended against extant ratite browsers. In feeding experiments on two tree species with different (heteroblastic) juvenile and adult branch morphology, emus and ostriches obtained adequate feeding rates from adult shoots but sub-maintenance feeding rates from juvenile shoots with the ratite-resistant traits. Divaricate juvenile shoots suffered 30Á/ 70% less biomass removal to the birds than adult shoots. Ratites browse by a distinctive clamping and tugging action. Structural defence traits that exploit the limitations of this feeding mode include narrow, strong, elastic branches that resist being torn off, wide branching angle (‘‘divaricate’’) that makes shoots difficult to swallow, and small, widely spaced leaves. -
HORIZONS Evolution of the Arctic Calanus Complex
JOURNAL OFJPR PLANKTON Advance RESEARCH Accessj VOLUME published0 j NUMBER January0 j PAGES 3, 12012–5 j 2012 HORIZONS Evolution of the Arctic Calanus complex: an Arctic marine avocado? Downloaded from JØRGEN BERGE 1,2*, TOVE M. GABRIELSEN 1, MARK MOLINE 1,3 AND PAUL E. RENAUD 1,4 1 2 UNIVERSITY CENTRE ON SVALBARD, PB 156, N-9171 LONGYEARBYEN, NORWAY, FACULTY OF BIOSCIENCES, FISHERIES AND ECONOMICS, UNIVERSITY OF 3 TROMSØ, N-9037 TROMSØ, NORWAY, CENTER FOR COASTAL MARINE SCIENCES, BIOLOGICAL SCIENCES DEPARTMENT, CALIFORNIA POLYTECHNIC STATE 4 UNIVERSITY, SAN LUIS OBISPO, CA 93407, USA AND AKVAPLAN-NIVA. FRAM CENTRE FOR CLIMATE AND THE ENVIRONMENT, N-9296 TROMSØ, NORWAY *CORRESPONDING AUTHOR: [email protected] http://plankt.oxfordjournals.org/ Received August 5, 2011; accepted in principle November 23, 2011; accepted for publication December 5, 2011 Corresponding editor: Mark J. Gibbons Before man hunted the large baleen whales to near extinction by the end of the nineteenth century, Arctic ecosystems were strongly influenced by these large pre- dators. Their main prey were zooplankton, among which the calanoid copepod at University Library of Tromsø on March 11, 2013 species of the genus Calanus, long considered key elements of polar marine ecosys- tems, are particularly abundant. These herbivorous zooplankters display a range of adaptations to the highly seasonal environments of the polar oceans, most notably extensive energy reserves and seasonal migrations to deep waters where the non-feeding season is spent in diapause. Classical work in marine ecology has suggested that slow growth, long lifespan and large body size in zooplankton are specific adaptations to life in cold waters with short and unpredictable feeding seasons. -
UC Riverside UC Riverside Electronic Theses and Dissertations
UC Riverside UC Riverside Electronic Theses and Dissertations Title Field Evaluation of Ion Uptake of Avocado Rootstocks as Affected by Salinity Permalink https://escholarship.org/uc/item/1vc893mb Author Celis, Nydia Publication Date 2016 Peer reviewed|Thesis/dissertation eScholarship.org Powered by the California Digital Library University of California UNIVERSITY OF CALIFORNIA RIVERSIDE Field Evaluation of Ion Uptake of Avocado Rootstocks as Affected by Salinity A Thesis submitted in partial satisfaction of the requirements for the degree of Master of Science in Environmental Sciences by Nydia Celis June 2016 Thesis Committee: Dr. Laosheng Wu, Chairperson Dr. Donald L. Suarez Dr. David E. Crowley Copyright by Nydia Celis 2016 The Thesis of Nydia Celis is approved: Committee Chairperson University of California, Riverside ACKNOWLEDGMENTS I would like to express my sincerest gratitude to my major advisor, Dr. Laosheng Wu, for accepting me into the program and for his advice and guidance throughout this process. I am especially grateful to Dr. Donald Suarez for his guidance, support, expertise, and patience. I also want to thank him for allowing me to use the facilities at the U.S. Salinity Laboratory to conduct the soil and plant analysis and for training me on various instruments. I would also like to thank Dr. David Crowley for serving in my thesis committee and giving me valuable recommendations and suggestions. Special thanks to Dr. Peggy Mauk for her collaboration on the funded research project. I would also like to thank all the staff who helped keep the project running Rui Li, Bruce Martin, Charles Farrar, Mahlet Desta, and Priya Kumar.