NASA SUMMER of INNOVATION How Do Plants Know Which Way To
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Plant Physiology
PLANT PHYSIOLOGY Vince Ördög Created by XMLmind XSL-FO Converter. PLANT PHYSIOLOGY Vince Ördög Publication date 2011 Created by XMLmind XSL-FO Converter. Table of Contents Cover .................................................................................................................................................. v 1. Preface ............................................................................................................................................ 1 2. Water and nutrients in plant ............................................................................................................ 2 1. Water balance of plant .......................................................................................................... 2 1.1. Water potential ......................................................................................................... 3 1.2. Absorption by roots .................................................................................................. 6 1.3. Transport through the xylem .................................................................................... 8 1.4. Transpiration ............................................................................................................. 9 1.5. Plant water status .................................................................................................... 11 1.6. Influence of extreme water supply .......................................................................... 12 2. Nutrient supply of plant ..................................................................................................... -
Smithsonian Miscellaneous Collections
SMITHSONIAN MJSCELLANEOUS COLLECTIONS VOLUME 81, NUMBER 10 TROPISMS AND SENSE ORGANS OF LEPIDOPTERA BY N. E. McINDOO Senior Entomologist, Deciduous-I'"i nit Insect Investigations, Bureau of Entomology, U. S. Department of Agriculture WMW (Publication 3013) t APR5-k CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION APRIL 4, 1929 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 81, NUMBER 10 TROPISMS AND SENSE ORGANS OF LEPIDOPTERA BY N. E. McINDOO Senior Entomologist, Deciduous-Fruit Insect Investigations, Bureau of Entomology, U. S. Department of Agriculture (Publication 3013) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION APRIL 4, 1929 Z^c Bovb (^aPfttnorc (preee BALTIMORE, MD., O. 8. A, TROPISMS AND SENSE ORGANS OF LEPIDOPTERA By N. E. McIndoo senior entomologist, deciduous-fruit insect investigations, bureau of entomology, u. s. department of agriculture CONTENTS PAGE Introduction 2 A. Tropisins 2 I. Phototaxis 3 1. Review of literature : 3 (a) Definitions and problems in the study of light reactions... 3 (b) Are light reactions adaptive ? 4 (c) Is orientation accomplished by selection of trial movements? 5 (d) How do light rays bring about orientation? 5 (e) Do circus movements support Loeb's theory? 5 (f ) What wave lengths stimulate insects most? 6 (g) Light traps are not yet considered successful 9 2. Phototactic experiments on codling-moth larvae 10 II. Chemotaxis 14 1. Review of literature 14 2. Chemotactic experiments on codling-moth larvae 17 III. Geotaxis 19 1. Review of literature 19 2. Geotactic experiments on codling-moth larvae 20 IV. Thigmotaxis 21 1. Review of literature 21 2. Thigmotactic experiments on codling-moth larvae 22 B. -
An Integrative Model of Plant Gravitropism Linking Statoliths
bioRxiv preprint doi: https://doi.org/10.1101/2021.01.01.425032; this version posted January 11, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 An integrative model of plant gravitropism linking statoliths position and auxin transport Nicolas Levernier 1;∗, Olivier Pouliquen 1 and Yoël Forterre 1 1Aix Marseille Univ, CNRS, IUSTI, Marseille, France Correspondence*: IUSTI, 5 rue Enrico Fermi, 13453 Marseille cedex 13, France [email protected] 2 ABSTRACT 3 Gravity is a major cue for the proper growth and development of plants. The response of 4 plants to gravity implies starch-filled plastids, the statoliths, which sediments at the bottom of 5 the gravisensing cells, the statocytes. Statoliths are assumed to modify the transport of the 6 growth hormone, auxin, by acting on specific auxin transporters, PIN proteins. However, the 7 complete gravitropic signaling pathway from the intracellular signal associated to statoliths to 8 the plant bending is still not well understood. In this article, we build on recent experimental 9 results showing that statoliths do not act as gravitational force sensor, but as position sensor, to 10 develop a bottom-up theory of plant gravitropism. The main hypothesis of the model is that the 11 presence of statoliths modifies PIN trafficking close to the cell membrane. This basic assumption, 12 coupled with auxin transport and growth in an idealized tissue made of a one-dimensional array 13 of cells, recovers several major features of the gravitropic response of plants. -
Ovary Signals for Directional Pollen Tube Growth
Sex Plant Reprod (2001) 14:3–7 © Springer-Verlag 2001 REVIEW M. Herrero Ovary signals for directional pollen tube growth Received: 15 December 2000 / Accepted: 13 June 2001 Abstract In angiosperms, the female gametophyte has a work has focussed on pollen tube growth along the stig- secluded life; it is protected by several concentric layers ma and style, the ovary has been neglected; it has often that envelop each other. The embryo sac is surrounded been assumed that once the pollen tubes arrive at the by the nucellus, which in turn is wrapped by the integu- base of the style fertilisation occurs. However, informa- ments forming the ovule, which is nested in the ovary. tion is converging toward the concept (Herrero 2000) These wrappings are not hermetic, but contain little that the process is far from straightforward, and that in “gates” the pollen tube must traverse on its way towards the ovary, also, an interesting male-female interaction the embryo sac. Information is emerging that shows that occurs. the ovary and ovule provide signals orienting and direct- A close look at the ovary shows that the female game- imng the pollen tube on the right course. There are three tophyte has a secluded life, protected by a number of main bodies of evidence supporting this hypothesis. One concentric layers that consecutively envelop each other. relates to developmental changes in the female tissues Thus, the embryo sac is surrounded by the nucellus, and how they affect pollen tube growth. The second re- which in turn is wrapped by the integuments forming the fers to defective ovule mutants, which induce defective ovule, which is nested in the ovary. -
Chemoattractive Mechanisms in Filamentous Fungi
Send Orders for Reprints to [email protected] 28 The Open Mycology Journal, 2014, 8, (Suppl-1, M2) 28-57 Open Access Chemoattractive Mechanisms in Filamentous Fungi Alexander Lichius1,* and Kathryn M. Lord2 1Institute of Chemical Engineering, Vienna University of Technology, Austria 2School of Biological Sciences, The University of Edinburgh, Scotland, United Kingdom Abstract: Research on cell communication and differentiation in filamentous fungi has provided a number of novel insights into chemoattractive mechanisms in recent years. Still, identification of specific chemoattractant molecules, cognate receptors and downstream signaling pathways is strongly biased towards those involved in mating; probably due to the relative ease of functional genomic comparison to the budding yeast model. The multicellular nature of filamentous fungi, however, preserved a more complex morphology compared to unicellular fungi and revealed chemoattractive mechanisms lost during yeast evolution. Two hallmarks of this higher complexity are the formation of an interconnected colony network and the development of elaborate sexual reproductive organs. Morphogenesis of both structures depends on two different modes of chemoattraction: attraction to self and attraction to nonself. Nonself chemoattraction between genetically distinct mating partners is the basis for sexual reproduction and generally regulated through a bilateral sex- pheromone/cognate-receptor system, widely but not exclusively equivalent to that known from yeasts. In contrast, self- chemoattraction between genetically identical cells is regulated independently of the sex-pheromone/cognate-receptor systems, and does not exist in yeast. Although both chemoattractive modes do share a number of molecular components, we are only beginning to understand how cell morphogenesis is regulated by means of gene expression and targeted protein recruitment during the establishment of self-fusion. -
Phototropism in Seedlings of Sunflower, Helianthus Annuus L
1 m % %ik PHOTOTROPISM IN SEEDLINGS OF SUNFLOWER, HELIANTHUS ANNUUS L. J. M. FRANSSEN NN08201,824 581.184.5:582.998 J. M. FRANSSEN PHOTOTROPISM IN SEEDLINGS OF SUNFLOWER, HELIÂNTHUS ANNUUSL. Proefschrift ter verkrijging van degraa d van doctor in de landbouwwetenschappen, opgeza gva n derecto r magnificus, dr. H. C.-vande rPlas , hoogleraar in de organische scheikunde, in het openbaar te verdedigen opvrijda g 14 november 1980 desnamiddag s tevie ruu r in de aula van de Landbouwhogeschool teWageningen . H. VEENMAN &ZONE N B.V. - WAGENINGEN - 1980 STELLINGEN I De Cholodny-Went theoriei snie t algemeen geldig. Dit proefschrift II De fototrope kromming in kiemplanten van Helianthusannum L. is onaf hankelijk van de groeisnelheid. Dit proefschrift III Fototropie in kiemplanten van Helianthus annuus L. is een blauw-licht effect, zoweltijden s de-etioleringal stijden s eenzijdige belichting. Dit proefschrift IV De bewering van Lam en Leopold dat de cotylen een rol spelen in de fototrope reactie is niet juist en berust op een door de cotylen gereguleerde invloed op delengtegroe i van het hypocotyl. LAM, S. L. and A. C. LEOPOLD (1966): Plant Physiol. 41, 847-851; SHUTTLEWORTH, J. E. and M. BLACK (1977): Planta t35, 51-55 V Debenaminge n 'tip-response'voo rd eeerst epositiev ereacti ee n 'base-response' voor de C-type reactie bij fototropie van geëtioleerde Avena saliva coleop- tielen zijn foutief. BLAAUW, O. H. and G. BLAAUW-JANSEN (1970): Acta Bot. Neerl. 19, 764-776. VI De basipetale verplaatsing van het punt van kromming, waargenomen in geo- tropie, is niet het gevolg van de geotrope reactie zelf maar van de auto- trope reactie. -
Tropism Flip Book Unit 8
Name ____________________________________________________________ Period _______ 7th Grade Science Tropism Flip Book Unit 8 Directions: You are going to create a quick reference chart for the various types of Tropism . Tropism is a term that refers to how an organism grows due to an external stimulus. For each type of tropism, you will need to provide a definition and a picture/example of that type of tropism. Below is a list of terms that you will include in your “Flip Book”. Flip Book Terms: Internal Stimuli External Stimuli Gravitropism Phototropism Geotropism Hydrotropism Thigmatropism How Do You Create a Flip Book? Step 1: Obtain 4 half sheets of paper. Stack the sheets of paper on top of each other. They should be staggered about a 2 cm. See the picture below. 2 cm 2 cm 2 cm Step 2: Now fold the top half of the 4 pieces of paper forward. Now all of the pieces of paper are staggered 2 cm. You should have 8 tabs. Place two staples at the very top. Staples Tab #1 Tab #2 Tab #3 Tab #4 Tab #5 Tab #6 Tab #7 Tab #8 Step 3: On the very top tab (Tab #1) you are going to write/draw the words " Tropism Flip Book ". You may use markers or colored pencils throughout this project to color and decorate your flip book. Also write your name and period. See the example below. Tropism Flip Book Your Name Period Step 4: At the bottom of each tab you are going to write each of the flip book terms (Internal Stimuli, External Stimuli, Gravitropism, Phototropism, Geotropism, Hydrotropism, and Thigmatropism ). -
Regulation of the Gravitropic Response and Ethylene Biosynthesis in Gravistimulated Snapdragon Spikes by Calcium Chelators and Ethylene Lnhibitors’
Plant Physiol. (1996) 110: 301-310 Regulation of the Gravitropic Response and Ethylene Biosynthesis in Gravistimulated Snapdragon Spikes by Calcium Chelators and Ethylene lnhibitors’ Sonia Philosoph-Hadas*, Shimon Meir, Ida Rosenberger, and Abraham H. Halevy Department of Postharvest Science of Fresh Produce, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel (S.P.-H., S.M., I.R.); and Department of Horticulture, The Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot 761 00, Israel (A.H.H.) vireacting organ; this causes the growth asymmetry that The possible involvement of Ca2+ as a second messenger in leads to coleoptile reorientation. Originally devised for snapdragon (Antirrhinum majus L.) shoot gravitropism, as well as grass coleoptiles, this theory was soon generalized to ex- the role of ethylene in this bending response, were analyzed in plain the manifold gravitropic reactions of stems and roots terms of stem curvature and gravity-induced asymmetric ethylene as well. Evidence in favor of the Cholodny-Went hypoth- production rates, ethylene-related metabolites, and invertase esis has emerged from various studies showing an asym- activity across the stem. Application of CaZ+ chelators (ethylenedia- metric distribution of auxin, specifically IAA, in gravi- minetetraacetic acid, trans-1,2-cyclohexane dinitro-N,N,N’,N’- stimulated grass coleoptiles (McClure and Guilfoyle, 1989; tetraacetic acid, 1,2-bis(2-aminophenoxy)ethane-N,N,N’,Nf,-tet- Li et al., 1991). However, it appears that changes in sensi- raacetic acid) or a CaZ+ antagonist (LaCI,) to the spikes caused a significant loss of their gravitropic response following horizontal tivity of the gravity receptor and time-dependent gravity- placement. -
Introduction to Gravitropism
CHATTARAJ, PARNA. Gravitropism in Physcomitrella patens : A Microtubule Dependent Process (Under the direction of Dr. Nina Strömgren Allen) The plant cytoskeleton plays an important role in the early stages of gravisignaling (Kiss, 2000). Although in vascular plants, actin filaments are used predominantly to sense changes in the gravity vector, microtubules have been shown to play an important role in moss gravitropism (Schwuchow et al., 1990). The moss Physcomitrella patens is a model organism and was used here to investigate the role of microtubules with respect to the gravitropic response. Dark grown caulonemal filaments of P. patens are negatively gravitropic and the readily imaged tip growing apical cell is a “single-cell system” which both senses and responds to changes in the gravity vector. MTs were imaged before and after gravistimulation with and without MT depolymerizing agents. Six-day-old filaments were embedded in low melting agarose under dim green light, allowed to recover overnight in darkness and gravistimulated for 15, 30, 60 and 120 min. Using indirect immunofluorecence and high resolution imaging, MTs were seen to accumulate in the lower flank of the gravistimulated tip cell starting 30 min post turning and peaking 60 min after gravistimulation of the cells. The microtubule depolymerizing drug, oryzalin (0.1 µM for 5 min), caused MTs to disintegrate and delayed MT redistribution by 3hrs 30min. Growth of the oryzalin treated filaments was analyzed and a delay in growth was observed for both gravi and non-gravistimulated filaments. Tip cells bulged and sometimes branched after 75 min. This study demonstrates that microtubules are important for growth in P. -
Chemical Gradients and Chemotropism in Yeast
Downloaded from http://cshperspectives.cshlp.org/ on October 4, 2021 - Published by Cold Spring Harbor Laboratory Press Chemical Gradients and Chemotropism in Yeast Robert A. Arkowitz Institute of Developmental Biology and Cancer, Universite´ de Nice - Sophia Antipolis – CNRS UMR6543, Centre de Biochimie, Faculte´ des Sciences, Parc Valrose, 06108 Nice Cedex 2, FRANCE Correspondence: [email protected] Chemical gradients of peptide mating pheromones are necessary for directional growth, which is critical for yeast mating. These gradients are generated by cell-type specific secretion or export and specific degradation in receiving cells. Spatial information is sensed by dedicated seven-transmembrane G-protein coupled receptors and yeast cells are able to detect extremely small differences in ligand concentration across their 5-mm cell surface. Here, I will discuss our current knowledge of how cells detect and respond to such shallow chemical gradients and in particular what is known about the proteins that are involved in directional growth and the establishment of the polarity axis during yeast mating. hemical gradients play critical roles in a G-proteins, as well the mechanisms involved Clarge number of developmental processes. in detection of small differences in ligand con- These gradients, which are precisely controlled centration across a yeast cell. The third section at both temporal and spatial levels, provide focuses on the different cellular responses an efficient means of encoding vectorial during chemotropism, in addition to what is information. Although diverse fungi generate known about how a growth site and an axis of chemical pheromone gradients during mating, polarity are established in response to an exter- because of its genetic tractability, most studies nal gradient. -
Chemocyanin, a Small Basic Protein from the Lily Stigma, Induces Pollen Tube Chemotropism
Chemocyanin, a small basic protein from the lily stigma, induces pollen tube chemotropism Sunran Kim*†, Jean-Claude Mollet*†‡, Juan Dong*, Kangling Zhang§, Sang-Youl Park*, and Elizabeth M. Lord*¶ *Center for Plant Cell Biology, Department of Botany and Plant Sciences, and §Mass Spectrometry Facility, Department of Chemistry, University of California, Riverside, CA 92521 Edited by June B. Nasrallah, Cornell University, Ithaca, NY, and approved October 24, 2003 (received for review June 19, 2003) In plant reproduction, pollination is an essential process that 2–3 days of anthesis. Tobacco (Nicotiana tabacum) plants were delivers the sperm through specialized extracellular matrices (ECM) grown in a growth chamber (12 h light͞dark cycle) at 22°C. For of the pistil to the ovule. Although specific mechanisms of guid- the expression studies, mature anthers, petals, and pistils were ance for pollen tubes through the pistil are not known, the female collected on the day of anthesis, as well as leaves and roots. tissues play a critical role in this event. Many studies have docu- mented the existence of diffusible chemotropic factors in the lily Protein Purification. The protein purification method was de- stigma that can induce pollen tube chemotropism in vitro, but no scribed previously (12) and used with some modifications. molecules have been isolated to date. In this study, we identified Proteins from 64 g of stigmas, ground in PBS (0.14 M NaCl͞2.7 ͞ ͞ a chemotropic compound from the stigma by use of biochemical mM KCl 1.5 mM KH2PO4 8.1 mM Na2HPO4), were precipi- ⅐ methods. We purified a lily stigma protein that is active in an in tated between 25% and 90% (NH4)2 SO4, dialyzed, applied to a vitro chemotropism assay by using cation exchange, gel filtration, CM-Sephadex C-25 cation exchange column (pH 5.6), and and HPLC. -
Auxin and Root Gravitropism: Addressing Basic Cellular Processes by Exploiting a Defined Growth Response
International Journal of Molecular Sciences Review Auxin and Root Gravitropism: Addressing Basic Cellular Processes by Exploiting a Defined Growth Response Nataliia Konstantinova, Barbara Korbei and Christian Luschnig * Department of Applied Genetics and Cell Biology, Institute of Molecular Plant Biology, University of Natural Resources and Life Sciences, Vienna (BOKU), Muthgasse 18, 1190 Wien, Austria; [email protected] (N.K.); [email protected] (B.K.) * Correspondence: [email protected] Abstract: Root architecture and growth are decisive for crop performance and yield, and thus a highly topical research field in plant sciences. The root system of the model plant Arabidopsis thaliana is the ideal system to obtain insights into fundamental key parameters and molecular players involved in underlying regulatory circuits of root growth, particularly in responses to environmental stimuli. Root gravitropism, directional growth along the gravity, in particular represents a highly sensitive readout, suitable to study adjustments in polar auxin transport and to identify molecular determinants involved. This review strives to summarize and give an overview into the function of PIN-FORMED auxin transport proteins, emphasizing on their sorting and polarity control. As there already is an abundance of information, the focus lies in integrating this wealth of information on mechanisms and pathways. This overview of a highly dynamic and complex field highlights recent developments in understanding the role of auxin in higher plants. Specifically, it exemplifies, how analysis of a single, defined growth response contributes to our understanding of basic cellular processes in general. Citation: Konstantinova, N.; Korbei, B.; Luschnig, C. Auxin and Root Keywords: auxin; polar auxin transport; root gravitropism; PIN-FORMED Gravitropism: Addressing Basic Cellular Processes by Exploiting a Defined Growth Response.