How Does Auxin Turn On Genes? | Plant Physiology

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Menu</span></a></div> </div> </div> <input id="routename" name="RouteName" type="hidden" value="plphys" /> </div> </div> </div> </div> <div id="ContentTab" class="content active"> <div class="widget widget-ArticleFulltext widget-instance-OUP_Abstract_Article_FullText_Widget"> <div class="module-widget"> <div class="widget-items" data-widgetname="ArticleFulltext"> <h2 class="abstract-title js-splitscreen-abstract-title at-Extract-Title">Extract</h2> <section class="abstract extract"> <p class="chapter-para">The plant hormone auxin (or IAA) plays a key role in a wide variety of growth and developmental processes. At the cellular level, auxin acts as a signal for division, extension, and differentiation during the course of the plant life cycle. At the whole-plant level, auxin plays an important role in root formation, apical dominance, tropism, and senescence. The question is how does such a simple molecule regulate such a plethora of responses within an assortment of cells, tissues, and organs of plants?</p><p class="chapter-para">The answer to this question requires an understanding of auxin perception, signal transduction, and gene regulation. At this time, little is known about how auxin is recognized as a hormone by plant cells or what receptor molecules are involved in this recognition. Although several classes of auxin-binding proteins have been identified and characterized (for review, see <span class="xrefLink" id="jumplink-R17"></span>Napier and Venis, 1995), it is not clear which if any of these function as receptors in signal transduction pathways that target the nucleus and regulate auxin-responsive gene expression. Likewise, the auxin signal transduction pathway involved in early auxin-regulated gene expression is currently a mystery. It is possible that one or several classes of auxin receptors and auxin signal transduction pathways exist in plant cells, and that these receptors and pathways are not uniformly distributed among different cell types and tissues. Multiple types of auxin receptors and signal transduction pathways could account for some of the diversity observed in different tissues and organs that respond to auxin in a variety of ways.</p>  <div class="widget widget-ArticlePubStateInfo widget-instance-OUP_ArticlePubStateInfo"> </div> </section> <div class="article-metadata-panel clearfix at-ArticleMetadata"></div> <div class="article-metadata-standalone-panel clearfix"></div>  <span id="UserHasAccess" data-userHasAccess="False"></span> </div> </div> </div> <div class="widget widget-SolrResourceMetadata widget-instance-OUP_Article_ResourceMetadata_Widget"> <div class="article-metadata-panel solr-resource-metadata js-metadata-panel at-ContentMetadata"> <div class="article-metadata-taxonomies"> </div> <div class="article-metadata-tocSections"> <div class="article-metadata-tocSections-title">Issue Section:</div> <a href="/plphys/search-results?f_TocHeadingTitleList=UPDATE+ON+HORMONE+ACTION">UPDATE ON HORMONE ACTION</a> </div> </div> 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