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作 者 ：张凤路;江亚丽;赵国顺;张俊花

期 刊 ：作物学报 2006年 32卷 07期 页码：1104-1106

关键词：玉米(ZeamaysL.)；14C-同化物；分配；籽粒败育；

Keywords:Maize(ZeamaysL.), 14C-assimilates, Distribution, Kernelabortion,

摘 要 ：通过¹⁴C示踪方法，研究了在籽粒发育前期饲喂果穗叶后14C-同化物在植株及果穗不同部位的分布。结果表明，果穗是灌浆期的主要库器官；¹⁴C-同化物在果穗不同部位的分布不均一，在穗轴中¹⁴C-同化物的分布呈现为基部＞中部＞上部，而在籽粒中则表现为中部＞基部＞上部。顶端穗轴中糖分含量不低于中部穗轴(P>0.05)，而败育粒中还原糖含量高于中部粒(P<0.05)。因此认为，顶端的败育可能并非源于营养供应不足，而应归因于籽粒库活性不足。

Abstract:

The distribution of ¹⁴C-assimilates in plant organs and different positions of ear in maize (Zea mays L.) was studied by feeding the ear leaf with ¹⁴CO₂ at early period of kernel development. The results showed that ear was the main sink organ during kernel filling period, but the distribution of ¹⁴C-assimilates was uneven in different parts of ear. The distribution of ¹⁴C-assimilates in cob ranked as basal>middle>upper part, while the amount of ¹⁴C-assimilates in kernel sequenced as middle>basal>upper part of the ear. The sugar concentration in upper cob was not less (P>0.05) than that in middle part, but the content of reducing sugar in aborted kernels was significantly higher (P<0.05) than that in kernels at middle part of ear. It suggests the main reason of kernel abortion at ear tip in maizewould be low sink strength in kernels instead of assimilate deficiency.

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