《植物生理学报》 2011, 47(6): 581-588

小麦‘兰考矮早八’茎蘖分蘖节的内源激素差异及其密度调控效应

冯伟, 徐丽娜, 朱云集, 王晨阳, 郭天财*

冯伟, 徐丽娜, 朱云集, 王晨阳, 郭天财*

通信作者：郭天财；E-mail: tcguo888@sina.com；Tel: 0371-63558205

摘　要：

选用分蘖成穗率低的大穗型品种‘兰考矮早八’, 研究主茎和两分蘖间分蘖节部位的激素差异与分蘖成穗的关系及其 密度调控效应。结果表明, 在分蘖两极分化过程中, 不同茎蘖间分蘖节中IAA和ZR含量及其IAA/ABA和ZR/ABA比值为主 茎>分蘖I>分蘖II, 而ABA含量为分蘖II>分蘖I>主茎。ZR含量、ABA含量及其IAA/ABA和ZR/ABA比值与分蘖成穗关系密 切, 较高的ZR含量、IAA/ABA和ZR/ABA比值以及较低ABA含量有利于分蘖成穗, 反之则将导致分蘖衰亡。随种植密度增加 和蘖位升高, 激素含量及其平衡在分蘖与主茎间差距加大, 分蘖弱势程度更突出, 进而导致分蘖衰亡, 且分蘖衰亡时间提前。

关键词：冬小麦; 大穗型; 种植密度; 分蘖成穗; 内源激素

收稿：2011-01-21   修定：2011-04-26

资助：现代农业(小麦)产业技术体系(MATS)专项经费和河南省重大科技攻关计划(102101110200)。

Differences of Endogenous Hormones in Tillering Node between Main Stem and Tillers and Their Regulation by Density in Wheat ‘LanKao Aizao 8’

FENG Wei, XU Li-Na, ZHU Yun-Ji, WANG Chen-Yang, GUO Tian-Cai*

National Engineering Research Center for Wheat/Henan Agricultural University, Zhengzhou 450002, China

Corresponding author: GUO Tian-Cai; E-mail: tcguo888@sina.com; Tel: 0371-63558205

Abstract:

The relationship between the endogeneous hormones in tillering node and of the tillers, and its regulation by planting densities were investigated with wheat (Triticum aestivum L.) ‘Lankao Aizao 8’. The results showed that the contents of IAA and ZR, the ratio of IAA/ABA and ZR/ABA in tillering node appeared as main stem>tillers I>tillers II during tiller polarizing stage, but ABA content was on the contrary. The higher contents of IAA, ZR and ratios of IAA/ABA and ZR/ABA in tillering node benefited tillering and earing, but higher ABA content had opposite effect. With the increase of planting density and high tillers position, the difference of contents and balance of hormones between the main stem and tillers enhanced, which lead to the earlier death of tillers.

Key words: winter wheat; large spike-type; planting density; tillering and earing; endogenous hormones