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phloem-mobile AuxlIAA transcript. Target to the Root Tip and Modify Root Architecture

Journal of Integrative Plant Biology 2012年第10期54卷 760-772页

作者： Michitaka Notaguchi Shmuel Wolf William J.Lucas Department of Plant Biology College of Biological SciencesUniversity of CaliforniaDavisCA 95616USA JST ERATO Higashiyama Live-Holonics Project Nagoya UniversityFuro-choChikusa-kuNagoyaauAichi 464-8602Japan The Robert H.Smith Institute of Plant Sciences and Genetics in Agriculture and the Otto Warburg Minerva Center for Agricultural Biotechnology The Hebrew University of JerusalemThe Robert H.Smith Faculty of AgricultureFood and EnvironmentRehovot 76100Israel

In plants, the phloem is the component of the vascular system that delivers nutrients and transmits signals from mature leaves to developing sink tissues. Recent studies have identified proteins, mRNA, and small RNA within the phloem sap of several plant species. It is now of considerable interest to elucidate the biological functions of these potential long-distance signal agents, to further our understanding of how plants coordinate their developmental programs at the whole-plant level. In this study, we developed a strategy for the functional analysis of phloem-mobile mRNA by focusing on IAA transcript., whose mobility has previously been reported in melon （Cucumis melo cv. Hale＇s Best Jumbo）. Indoleacetic acid （IAA） proteins are key transcript.onal regulators of auxin signaling, and are involved in a broad range of developmental processes including root development. We used a combination of vasculature-enriched sampling and hetero-grafting techniques to identify IAA18 and IAA28 as phloemmobile transcript. in the model plant Arabidopsis thaliana. Micro-grafting experiments were used to confirm that these IAA transcript., which are generated in vascular tissues of mature leaves, are then transported into the root system where they negatively regulate lateral root formation. Based on these findings, we present a model in which auxin distribution, in combination with phloem-mobile Aux/IAA transcript., can determine the sites of auxin action.

关键词： Arabidopsis AUX/IAA lateral root development grafting phloem-mobile transcript.

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