在一般大田环境中，控制玉米果穗的授粉情况，研究果穗在套 袋和自然授粉时可溶性 糖和淀粉在花丝和穗轴中的变化情况。

A study was conducted under general field condition to control pollination so as to investigate the dynamic of soluble sugar and starch in the cob and silk of two varieties corn.

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的生物学特点，实践上常采用不套袋杂交授粉技术，理论分析和间接检测结果证明这种杂交授粉方式的花粉污染率低于1% ，但到目前为止仍缺乏直接的检测证据。

Theoretical analysis and indirect detection indicated that the pollen contamination rate of this pollination technique was no higher than 1%. But there is no evidence from direct detection by now.

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