芽的异质性:枝条或茎上不同部位生长的芽由于形成时期﹑环境因子及营养状况等不同，造成芽的生长势及其他特性上存在差异，称为芽的异质性。层积处理是指在适宜的条件下，完成种胚的后熟过程和解除休眠促进萌发的一项措施。
增效作用又称协合作用或相生作用。不同物质或生物间的相互协作作用,其产生的效果大于各个成分效果的总合http://groups.tianya.cn/post-10498-e9f228610e5b43c58accd9c1ae3026d7-1.shtml
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