顶交 top cross， inbred－variety cross

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　　是杂种优势育种法之一。指近交系和品种的杂交。这是作为利用杂种优势方法的初级阶段。实用上利用品种作为母本，这样可以收到更多的种子，此外为了鉴定一般组合的能力也常采用顶交方法。

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