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作物良种的混杂退化是一个生产上应当引为重视的问题,它直接影响着作物产量的提高和良种的使用寿命。混杂和退化是两个不同的概念,但又是相互影响的。混杂是退化的前奏,退化是混杂的结果(当然还有其它因素造成退化)。小麦虽然是自花授粉作物,但在开花期间,颖壳开
The mixed degeneration of crop varieties is a problem that should be paid attention to in production, which directly affects the increase of crop yield and the useful life of the elite. Confusion and degeneracy are two different concepts, but they also influence each other. Confusion is a prelude to degradation, degradation is a mixed result (of course, other factors cause degradation). Although wheat is a self-pollinating crop, the glume shell opens during flowering