Regulation of root growth by gibberellin in Lemna minor
Regulation of root growth by gibberellin in Lemna minor
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DOI：
10.1093/pcp/41.6.657
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发表时间：
2000-06-01
影响因子：
4.9
通讯作者：
Shimmen, T
中科院分区：
文献类型：
--
作者：
Inada, S;Tominaga, M;Shimmen, T
对小浮萍根系生长的激素调控进行了研究。添加赤霉酸(GA(3))不能促进根的生长，但赤霉素生物合成抑制剂烯效唑P(Un-P)显著抑制根的生长。未施磷植株的根长和根径均显著小于对照植株，主要是由于细胞分裂受到抑制所致。在表皮细胞中，非磷处理使其长度略有缩短，宽度略有增加，表明伸长生长受到抑制。GA(3)可完全消除非磷对磷的抑制作用。伸长区表皮细胞的横向皮质微管(CMTs)在UnP处理下显著破碎，但在GA(3)存在下处理不显著。未加磷处理的细胞内纤维微原纤维排列较对照细胞更随意、更倾斜。这些结果表明，小落叶松的根系生长受内源赤霉素的调控。
Hormonal control of root growth was studied in Lemna minor. Although addition of gibberellic acid (GA(3)) to the culture medium did not promote the root growth, a gibberellin biosynthesis inhibitor, uniconazole P (Un-P), significantly inhibited root growth. Both length and diameter of roots in Un-P-treated plants were significantly smaller than those in control plants, mainly caused by inhibition of cell division. In epidermal cells, the length was slightly decreased and the width increased by Un-P treatment, indicating inhibition of elongation growth. GA(3) completely nullified the inhibition caused by Un-P. Transverse cortical microtubules (CMTs) of epidermal cells in the elongation zone were significantly fragmented by treatment with Un-P, but not by that in the presence of GA(3). The cellulose microfibril array in the Un-P-treated cells was more random and more oblique than that in the control cells. These results suggested that root growth in L. minor is regulated by endogenous gibberellin.