75 Integrating Membrane Transport with Male Gametophyte ... - TAIR

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185 DAWDLE, a Forkhead-Associated Domain Gene, Regulates Plant Development David Chevalier, Erin Morris, John Walker University of Missouri, Columbia, MO Phosphoprotein-binding domains are found in many different proteins and specify protein-protein interactions critical for signal transduction pathways. Fork-head associated (FHA) domains bind phosphothreonine containing peptides and control many aspects of cell proliferation in yeast and animal cells. The Arabidopsis thaliana protein, Kinase Associated Protein Phosphatase includes a FHA domain that mediates interactions with receptor-like kinases, which in turn regulate a variety of signaling pathways involved plant growth and pathogen responses. Screens for insertional mutations in other Arabidopsis FHA domain containing genes identified a mutant with pleiotropic defects. dawdle (ddl) plants are developmentally delayed, produce defective roots, shoots, flowers, and have reduced seed set. DDL is expressed in the root and shoot meristems and the reduced size of the root apical meristem in ddl plants suggest a role early in organ development. 186 The Circadian Clock Regulates Auxin Signaling and Responses in Arabidopsis Michael Covington, Stacey Harmer Section of Plant Biology, College of Biological Sciences, University of California, Davis, California, USA The circadian clock plays a pervasive role in the temporal regulation of plant physiology, environmental responsiveness, and development. In contrast, the phytohormone auxin plays a similarly far-reaching role in the spatial regulation of plant growth and development. Seventy years ago, Went and Thimann noted that plant sensitivity to auxin varied according to the time of day, an observation which they could not explain. Here we present work that explains this puzzle, demonstrating that the circadian clock regulates auxin signal transduction. Using genome-wide transcriptional profiling, we found many auxin-induced genes are under clock regulation. We verified that endogenous auxin signaling is clock regulated with a luciferase-based assay. Exogenous auxin has only modest effects on the plant clock, but the clock controls plant sensitivity to applied auxin. Significantly, we found both transcriptional and growth responses to exogenous auxin are gated by the clock. Thus the circadian clock regulates some, and perhaps all, auxin responses. As a consequence, many aspects of plant physiology not previously thought to be under circadian control may show timeof-day specific sensitivity, with likely important consequences for plant growth and environmental responses. The project was supported by the NRI of the USDA CSREES (2004-35100-14903 to MFC) and the NIH (5R01GM069418-02 to SLH).
187 Arabidopsis BRANCHED genes are the local switches of axillary bud outgrowth Jose Aguilar, Cesar Poza, Pilar Cubas Centro Nacional de Biotecnologia Plant architecture greatly depends on its branching patterns. Branches are formed from meristems initiated in the axils of leaves. Axillary meristems may develop immediately giving new shoots or they may become arrested after a short period of growth as dormant axillary buds. This decision is affected by endogenous and environmental factors. We are studying two Arabidopsis genes coding for TCP transcription factors, BRANCHED1 (BRC1) and BRANCHED2 (BRC2) that control this key decision. BRC genes act within the bud, preventing the progression of bud development. They are expressed from the earliest stages of bud development (newly initiated meristems) to the latest stages (reproductive buds) before the bud outgrowth and they become down-regulated at the time of branch elongation. In brc mutants, initiation and progression of bud development is accelerated and more axillary buds bolt to give a branch. Consistently to their spatially restricted expression patterns, brc mutant phenotypes are not pleiotropic; they affect exclusively bud development. Changes in environmental or endogenous factors affecting bud outgrowth such as growth density or decapitation are associated with changes in BRC genes mRNA levels. Moreover, bushy max mutants have very reduced levels of BRC mRNA and ycc mutants, with strong apical dominance, have increased levels of these genes. Therefore BRC genes seem to act as local switches of bud growth: they may integrate hormone-mediated developmental and environmental signals controlling bud dormancy and translate them into local responses of axillary growth arrest. BRC genes are the orthologs of the TEOSINTE BRANCHED1 (TB1) gene, responsible for the strong apical dominance of the maize suggesting that TB1/BRC function is widely conserved among flowering plants. This reveals an ancestral genetic mechanism of branching control that may have evolved in land plants before the emergence of angiosperms. We are currently identyfying the upstream and downstream genes of BRC genes to try to reconstruct the cascade of signals controlling branching. 188 Carotenoids and Plant Development Abby Cuttriss 1 , Susan Cossetto 1 , Colin Turnbull 2 , Barry Pogson 1 1 ARC Centre of Excellence in Plant Energy Biology, ANU, Canberra, Australia, 2 Imperial College London, Wye, Kent, United Kingdom Carotenoid pigments are crucial for the survival and optimal growth of plants. Here we investigate a unique link between carotenoids, apical dominance and chloroplast development in the novel ccr1 (carotenoid and chloroplast regulation) mutant. The ccr1 mutant was characterised in terms of pigment composition, expression of key carotenoid biosynthetic genes and plant morphology. The primary developmental defect in ccr1 was an increase in axillary shoot branching. The primary chloroplastic phenotypes were reduced lutein and aberrant photomorphogenesis. Alterations in the pigment profile were caused by a specific reduction in transcript abundance of the carotenoid isomerase and lycopene ε-cyclase genes. Recent identification of the CCR1 gene and expression analyses indicate that auxin is critical in the control of carotenoid composition and axillary bud outgrowth.
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75 Integrating Membrane Transport w
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79 PREP: Partnership for Research a
Page 5 and 6: 83 Characterization of Orthologous
Page 7 and 8: 87 High-density Arabidopsis Protein
Page 9 and 10: 91 Approaches to Study Homologous R
Page 11 and 12: 95 Predicting the Redundome: A Geno
Page 13 and 14: 99 ReIN: an interactive tool to cre
Page 15 and 16: 103 Proteomic services at the Europ
Page 17 and 18: 107 Ubiquitin Lys 63 Chain Forming
Page 19 and 20: 111 Characterization of the Anti-mi
Page 21 and 22: 115 Molecular Genetic Analysis of P
Page 23 and 24: 119 CLB19, a Novel Pentatricopeptid
Page 25 and 26: 123 The Arabidopsis CDC48 Adapter P
Page 27 and 28: 127 AtCKT1, a Novel Transporter for
Page 29 and 30: 131 Sub-Cellular Localization of DR
Page 31 and 32: 135 Discovering the function of WAV
Page 33 and 34: 139 WRINKLED1, an AP2/EREBP Class T
Page 35 and 36: 143 The Ubiquitin-Specific Protease
Page 37 and 38: 147 Systemic signal transduction of
Page 39 and 40: 151 Dissection of Flowering Pathway
Page 41 and 42: 155 Dissecting genetic pathways und
Page 43 and 44: 159 HANABA TARANU (HAN) Organizes A
Page 45 and 46: 163 What are SCAMPS doing in plants
Page 47 and 48: 167 Analysis of DNA methylation and
Page 49 and 50: 171 Identification of TIA as a Myb-
Page 51 and 52: 175 DEMETER DNA Glycosylase Regulat
Page 53 and 54: 179 Investigation Of The Connection
Page 55: 183 Genetic Analysis of Vascular Pa
Page 59 and 60: 191 Regulation Of BDL Gene Expressi
Page 61 and 62: 195 ARROW1 (ARO1), a Novel Regulato
Page 63 and 64: 199 The Trichome Pock Phenotype of
Page 65 and 66: 203 Control of Leaf Vascular Patter
Page 67 and 68: 207 FAMA Controls The Switch Betwee
Page 69 and 70: 211 Subtilisin-like serine protease
Page 71 and 72: 215 TRIDENT and VARICOSE encode com
Page 73 and 74: 219 Analysis of a Mutant, #1-63, wh
Page 75 and 76: 223 Quantitative Trait Analysis of
Page 77 and 78: 227 LEAFY and the Evolution of Rose
Page 79 and 80: 231 Overexpression of Arabidopsis S
Page 81 and 82: 235 Ethylene Signaling Components A
Page 83 and 84: 239 Accumulation of Reactive Oxygen
Page 85 and 86: 243 Intracellular Production Of Rea
Page 87 and 88: 247 Large-Scale Screen and Isolatio
Page 89 and 90: 251 Ontogeny of the Arabidopsis Cir
Page 91 and 92: 255 Cell type-specific expression a
Page 93 and 94: 259 Characterization of Flowering T
Page 95 and 96: 263 Involvement of Cytokinins and T
Page 97 and 98: 267 Identification of new actors of
Page 99 and 100: 271 Scarecrow-like Protein SCL14 In
Page 101 and 102: 275 Protein Prenylation Is Required
Page 103 and 104: 279 Mechanisms controlling coordina
Page 105 and 106: 283 GLZ1, a member of family 8 glyc
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287 Arabidopsis as a Model System t
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291 The NIMIN-NPR1 Connection: A Mo
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295 A Search for Transcriptional Re
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299 Identification of genes contrib
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303 Regulation of AGAMOUS Expressio
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307 Genetic Control of the Interplo
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311 Centromeric Retrotransposons: P
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315 Finding Intron Sequences That E
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319 Biochemical Characterization Of
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323 Fluorescent amino acid sensors
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327 The Role of Tryptophan Metaboli
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331 A Putative Bifunctional Wax Est
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335 Analysis of the Complex BIO3 /
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339 Exploring of Arabidopsis non-ho
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343 A Yeast-2-Hybrid Assay Reveals
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347 Genetic Mechanisms of Glucosino
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351 Potent Induction of flowering b
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355 Phylogenetic Analysis of Arabid
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359 eQTL-mapping reveals AMP2A, a c
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363 Progress Towards the Cloning of
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367 Natural Variation in Infloresce
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371 Natural Variation for Seed Dorm
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375 Natural genetic and epigenetic
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379 SPIKE1 is a guanine nucleotide
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383 The RAD23 Family of Ubiquitin-L
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387 Molecular Functions of ARL2 and
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391 Characterization of the Sugar-I
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395 Functional analysis of phosphat
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399 Identification and Characteriza
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403 Association and Localization of
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407 Functional Requirements for PIF
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411 Using High-throughput Chemical
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415 The F-box Protein PPS Functions
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419 Round The Clock - The Molecular
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423 Protein Prenylation Process Neg
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427 Integration of light and abscis
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431 Functional analysis of ROP10 sm
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435 The Importance Of RecQ Like Hel
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439 A Comparison of Full Versus Par
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