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标题：Involvement of cytokinins in adventitious and lateral root formation
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作者：Takeshi Kuroha ; Shinobu Satoh
期刊名称：Plant Root
电子版ISSN：1881-6754
出版年度：2007
卷号：1
页码：27-33
DOI：10.3117/plantroot.1.27
出版社：Japan Science and Technology Information Aggregator, Electronic
摘要：The root systems of higher plant consist of primary, lateral, and adventitious roots. There is a current hypothesis, named ‘root apical dominance’, that root-derived suppressor negatively regulates the formation of adventitious and lateral roots. According to this hypothesis, we have studied the mechanisms involved in the regulation of adventitious and lateral root forma-tion. trans -zeatin riboside (ZR), one of cytokinin species, was identified in squash root xylem sap as a main suppressor of adventitious root formation in cucumber, suggesting that ZR transported from root via xylem sap acts as an endogenous suppressor of hypocotyl adventi-tious root formation in planta . Moreover, we isolated Arabidopsis mutant, wooden leg-3 ( wol-3 ), for stimulated adventitious root formation in intact plants. Analyses of wol-3 mutant have revealed that cytokinin receptors are necessary for the primary and lateral root formation via the formation of auxin-transporting vascular tissues in the hypocotyl, but not for adventitious roots. In this review, we discuss the relationship between cytokinin and adventitious and lateral root formation.
关键词：adventitious root;auxin;cytokinin;lateral root;xylem sap