Roles of auxin and gibberellic acid in growth and maturation of epicotyls of Vigna angularis: Cell wall changes
Roles of auxin and gibberellic acid in growth and maturation of epicotyls of Vigna angularis: Cell wall changes
复制标题
生长素和赤霉酸在绿豆上胚轴生长和成熟中的作用：细胞壁变化
DOI：
10.1111/j.1399-3054.1982.tb04897.x
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发表时间：
1982
影响因子：
6.4
通讯作者：
Y. Masuda
中科院分区：
文献类型：
--
作者：
K. Nishitani;Y. Masuda
The effects of auxin and gibberellic acid on cell wall composition in various regions of epicotyls of azuki bean (Vigna angularis Ohwi and Ohashi cv. Takara) were investigated with the following results. (1) Young segments excised from apical regions of the epicotyl elongated in response to added 10−4M indole-3-acetic acid (IAA). When the segments were supplied with 50 mM sucrose, the IAA-induced segment growth was accompanied by enhanced overall synthesis of cell wall polysaccharides, such as xyloglucans, polyuronides and cellulose. This IAA effect on the cell wall synthesis is a consequence of extension growth induced by IAA. Gibberellic acid (GA) at 10−4M synergistically enhanced the IAA-induced cell wall synthesis as well as IAA-induced extension growth, although GA by itself neither stimulated the cell wall synthesis nor extension growth. In the absence of sucrose, cell wall synthesis was not induced by IAA or GA. (2) In mature segments excised from basal regions of the epicotyl, no extension growth was induced by IAA or GA. GA enhanced the synthesis of xylans and cellulose when the segments were supplied with 50 mM sucrose. IAA had no effect on the cell wall synthesis. These findings indicate that synthesis of polyuronides, xyloglucans and cellulose, which occurs during extension growth of the apical region of the epicotyl, is regulated chiefly by auxin whereas synthesis of xylans and cellulose during cell maturation in the basal region of the epicotyl is regulated by GA.
