The Root Cap Determines Ethylene-Dependent Growth and Development in Maize Roots

作     者：Achim Hahn Roman Zimmermann Dierk Wanke Klaus Harter Hans G. Edelmann 

作者机构：Botanisches Institut Universitfit zu Koin Gyrhofstr. 15 D-50931 Koin Germany Present address: ZMBP Pflanzenphysiologie University TQbingen Auf der Morgenstelle 1 D-72076 TQbingen Germany Institut fur Entwicklungsbiologie Universitat zu Koin Gyrhofstr. 17 D-50931 Koin Germany Institut fur Entwicklungsbiologie Universitat zu Koin Gyrhofstr. 17 D-50931 Koln Germany ZMBP Pflanzenphysiologie Universitat Tubingen Auf der Morgenstelle 1 D-72076 Tubingen Germany Present address: Biologie und ihre Didaktik Universitat Siegen D-57068 Siegen Germany 

出 版 物：《Molecular Plant》 (分子植物（英文版）)

年 卷 期：2008年第1卷第2期

页      面：359-367页

核心收录：

学科分类：0710[理学-生物学] 081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 09[农学] 071007[理学-遗传学] 0901[农学-作物学] 0902[农学-园艺学] 090102[农学-作物遗传育种] 

基　　金：Ha 2146/5–2 Deutsche Forschungsgemeinschaft,DFG 

主　　题：AUXIN BIOSYNTHESIS INSENSITIVE MUTANTS CELL ELONGATION 

摘      要：Besides providing protection against mechanical damage to the root tip, the root cap is involved in the perception and processing of diverse external and internal stimuli resulting in altered growth and development, The transduction of these stimuli includes hormonal signaling pathways such as those of auxin, ethylene and cytokinin. Here, we show that the root cap is essential for the ethylene-induced regulation of elongation growth and root hair formation in maize. Exogenously applied ethylene is no longer able to inhibit elongation growth when the root cap has been surgically removed prior to hormone treatment. Reconstitution of the cap positively correlates with the developing capacity of the roots to respond to ethylene again. In contrast, the removal of the root cap does not per se affect growth inhibition controlled by auxin and cytokinin. Furthermore, our semi-quantitative RT-PCR results support earlier findings that the maize root cap is a site of high gene expression activity with respect to sensing and responding to hormones such as ethylene, From these data, we propose a novel function of the root cap which is the establishment of competence to respond to ethylene in the distal zones of the root.