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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。
The panicle type “Lankao Aizao 8” with low tillering rate was used to study the relationship between hormones at the tiller node and the tiller node and the density-controlling effect. The results showed that IAA and ZR, IAA / ABA and ZR / ABA were the main stem> tiller I> tiller II, and the ABA contents were tiller II> tiller I > Main stem. ZR content, ABA content and its IAA / ABA and ZR / ABA ratio were closely related to tillering panicle heading. Higher ZR content, IAA / ABA and ZR / ABA ratio and lower ABA content were favorable for tillering to the ear, and vice versa Lead to the decline of tillers. With the increase of planting density and tillering position, the difference of hormone content and balance between tiller and main stem increased, and the tillering weakness was more prominent, which led to the decline of tillering and earlier tiller decline.