文档介绍：
生长素和细胞分裂素调控水稻分蘖的位置
效应#
刘杨,丁艳锋,王强盛,李刚华,刘正辉,王绍华**
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(南京农业大学农业部南方作物生理生态重点开放实验室,南京 210095)
摘要:生长素和细胞分裂素在调节水稻分蘖中有着极其重要的作用,生长素抑制分蘖的发生,
细胞分裂素促进水稻分蘖。然而,外源生长素(IAA)和细胞分裂素(CTK)显著影响水稻
分蘖芽的萌发和休眠,但其位置效应还缺乏相关研究。本研究在分蘖期和齐穗期通过对不同
叶片和根部施用 IAA 和 6-BA(一种人工合成 CTK),观察并记录了不同处理分蘖芽的生长
及芽和节中内源激素的变化。现阶段的研究表明,生长素和细胞分裂素在调控水稻分蘖芽生
长过程中存在着位置效应。结果表明,生长素在对水稻分蘖芽生长调控上有着很显著的位置
效应,并且生长素的位置效应和他的极性运输关系密切。叶片中 IAA 含量的上升抑制了非
伸长节腋芽的生长;然而只有当上部的节的叶片或者分蘖节所在的叶片的 IAA 升高才会抑
制伸长节分蘖芽的生长。和 IAA 相反,6-BA 在调控水稻分蘖芽的生长上不存在位置效应。
对不同叶片和根部伸长节和非伸长节施用 6-BA 可以显著的促进水稻分蘖芽的生长。
关键词:作物栽培学与耕作学;分蘖;生长素;细胞分裂素;位置效应
中图分类号:S311
The Positional Effects of Auxin and Cytokinin on the
Regulation of Rice Tiller Bud Growth
Liu Yang, Ding Yanfeng, Wang Qiangsheng, Li Ganghua, Liu Zhenghui,
Wang Shaohua
(Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture,
NanJing 210095)
Abstract: Auxin and cytokinin (CTK) play important roles in the regulation of rice (Oryza sativa
L.) tiller bud growth. Auxin inhibits bud growth and CTK promotes growth; however, little is
known about the positional effects of these hormones in the regulation of rice tiller bud growth. In
the present study, indole-3-acetic acid (IAA) and 6-benzylaminopurine (6-BA) (a synthetic CTK)
were applied to different leaves and roots at the tillering and heading stages of rice development,
and the growth of rice tiller buds on the unelongated and elongated internodes was measured.
Additionally, hormonal variations of the plants were examined and recorded. The objectives of the
present study were to investigate the positional effects of auxin and CTK on the regulation of rice
tiller bud growth. The results indicate that IAA has a notable positional effect on the regulation of
rice tiller bud growth, and the positional effect of IAA was closely related to its polar transport.
An increase in leaf IAA levels inhibited the growth of tiller buds located at unelongated nodes;
however, growth o