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Plants from Sea to Sky Abstracts Table of Contents

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Plants from Sea to Sky Abstracts Table of Contents Plants from Sea to Sky Abstracts Table of Contents Plenary Session 1 ................................................................................................................................. 2 CD Nelson Lecture ................................................................................................................................ 3 Plenary Session 2 ................................................................................................................................. 4 Education Forum .................................................................................................................................. 6 Plenary Session 3 ................................................................................................................................. 6 Carl Douglas Symposium ................................................................................................................... 7 Concurrent Oral Presentations ....................................................................................................... 9 Cell Biology I ...................................................................................................................................................... 9 Seeds to Sky .................................................................................................................................................... 12 Abiotic Stress I ............................................................................................................................................... 15 Nutrients and Metabolism ......................................................................................................................... 18 Sexual Reproduction ................................................................................................................................... 21 Specialized Metabolism I (Anatomy and Defence) ............................................................................ 24 Abiotic Stress II ............................................................................................................................................. 27 Biotic Stress .................................................................................................................................................... 31 Cell Biology II (Cell Walls) ......................................................................................................................... 34 Ecophysiology ................................................................................................................................................ 37 Technological Innovations ........................................................................................................................ 40 Specialized Metabolism II .......................................................................................................................... 43 Development .................................................................................................................................................. 46 Biochemistry .................................................................................................................................................. 49 Applied Plant Biology ................................................................................................................................. 52 Biotic Interactions ........................................................................................................................................ 55 Posters – Session 1 ............................................................................................................................. 59 Abiotic Stress Posters (101-AB to 120-AB) ......................................................................................... 59 Biotic Stress Posters (121-BS to 141-BS) ............................................................................................. 69 Cell Biology I Posters (142-CB to 151-CB) ........................................................................................... 80 Nutrients and Metabolism Posters (152-NM to 154-NM) ............................................................... 85 Sexual Reproduction Posters (155-SR to 160-SR) ............................................................................ 87 Posters – Session 2 ............................................................................................................................. 90 Applied Biology / Global Food Security Posters (199-AP to 210-AP) ......................................... 90 Biochemistry Posters (211-BC to 214-BC) ........................................................................................... 96 Biotechnology/Tech Innovations Posters (215-BT to 218-BT) .................................................... 98 Biotic Interactions Posters (219-BI to 227-BI) ................................................................................ 100 Technological Innovations Posters (226-BI to 227-BI) ................................................................. 103 Cell Wall Posters (228-CW to 235-CW) ............................................................................................... 105 Development Posters (236-DV to 248-DV) ........................................................................................ 109 Education Posters (249-ED to 250-ED) ............................................................................................... 116 Specialized Metabolism Posters (251-SM to 260-SM) ................................................................... 117 Plants from Sea to Sky Delegates ............................................................................................... 122 Plenary Session 1 Wednesday July 5; 9:00 - 11:20 am; Forest Sciences Centre, Room 1005 Chair: Geoffrey Wasteneys, University of British Columbia PLEN1.1: Mechanical and Chemical Signals in the Control of Arabidopsis Stem Cells Elliot M. Meyerowitz Howard Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology Experiments indicate that physical stress in the shoot apical meristem of Arabidopsis thaliana controls at least two aspects of cell biology – the cortical cytoskeleton, and the subcellular location of the PIN1 auxin efflux carrier. Cortical microtubules align in shoot apical meristem epidermal cells such that they are parallel to the principal direction of maximal stress when the stress is anisotropic. PIN1 is asymmetrically distributed in the plasma membranes of the same cells, with the highest amount in the membrane adjacent to the most stressed side wall. As cellulose synthase complexes use microtubules as tracks, one effect of cytoskeletal response is to reinforce walls in the maximal stress direction, thereby directing cell expansion to be orthogonal to the stress – creating a system that, through stress patterns, senses tissue shape, and through the effects of stress on cell wall synthesis, changes tissue shape. One effect of mechanically-determined PIN1 localization is redirection of auxin flow, which controls rates of cell expansion and position of new leaf and floral primordia in the meristem. Mechanical stress therefore creates a supracellular, tissue-wide feedback system that responds to and creates plant shape, and controls phyllotaxis through auxin flow control. This system has been amenable to computational modeling, leading to predictive models that show how the interplay of mechanical and chemical signals plays a central role in pattern formation and morphogenesis at the shoot apical meristem. [email protected] PLEN1.2: Why gels matter: roles for pectin and alginate in development of walled organisms Siobhan A. Braybrook University of California, Los Angeles Sainsbury Laboratory, University of Cambridge In organisms with walled cells the cell wall acts as the final regulator of cell growth and shape change. Whether single celled or multi-cellular, the material changes in the cell wall required for growth must be controlled in space and time in order to produce a fit and functional organism. In plants, the cell wall consists of a cellulose re-enforced gel matrix comprised of pectin and hemi-cellulose. In brown algae, the cell wall has less cellulose and is instead a thicker matrix comprised of alginate and fucans. Currently, we are focusing of the role of cell wall gels 9pectin and alginate) in development of plants and algae. Our lab has been investigating the physical properties of cell walls, and their components, towards an understanding of how these properties might change to allow cell growth. These investigations involve the development of new in situ mechanical testing methods for cell walls (both natural and in material mimics), examining wall physical properties during growth and development, and investigating the underlying genetic and hormonal regulatory mechanisms specifying these changes. Our systems of study include plants and brown algae: the Arabidopsis thaliana hypocotyl and shoot apex, the Fucus serratus embryo, the Sargassum muticum apex, and the Nicotiana benthamiana leaf epidermis. [email protected] 2 PLEN1.3: The plant microbiome at the intersection of metabolism and defense Cara Haney Michael Smith Laboratory, The University of British Columbia, Canada Department of Microbiology & Immunology, The University of British Columbia, Canada Plant root-associated microbial communities (the “rhizosphere
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