寄主群体抗病性的遗传异质性对病害损失可起缓冲作用,是早就为人们所认识的概念。然而,直到现在,由于存在争论和实际问题,它在现代农业中的应用仍然是非常有限的。多系的理论,发展和应用曾由布朗宁(Browning)和弗雷(Frey)于1969年全面评述过,本文的目的是提出一些新的观点。多系的概念这里讨论的多系概念,不限于由具有不同 The genetic heterogeneity of the disease resistance of the host group can play a buffering role in the loss of the disease and is a concept that has long been recognized by people. However, until now, its use in modern agriculture has remained very limited due to controversy and practical problems. The theory, development and use of multiple systems was comprehensively reviewed by Browning and Frey in 1969, and the purpose of this article is to present some new ideas. The concept of multi-lines Multi-line concepts discussed here are not limited to those having different meanings