本文在回顾农作物杂优利用研究历史的基础上,着重对三大谷物杂种的产量优势行了比较,指出它们之间存在着明显的固有差异,并从遗传学角度分析和讨论了三大谷物间杂种产量优势差异产生的原因,指出目前自我国小麦再高产育种的有效途径,仍然应该是在常规有性杂交育种的基础上,对育种方法的改进。 On the basis of reviewing the history of utilization of crop heterozygosis, this paper focuses on the comparison of yield advantages of the three major grain hybrids, and points out that there are obvious inherent differences between them. From the perspective of genetics, It is pointed out that at present, the effective way of re-breeding high-yielding wheat in our country should still be to improve the breeding method on the basis of conventional sexual cross breeding.