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多系品种指由几个纯系品种或品系的种子,按一定比例混合成播种材料的一个品种群体。其中也包括由2个品系混合而成的混系品种或混合品种。混合群体中的各成员品种,每年都要繁殖原种,都要按一定比例,将各成员的原种种子混合。成为品种的一个基本条件就是群体的遗传组成处于平衡状态。如果这个群体的遗传平衡被打破,品种就会发生退化。而多系品种是靠人们每年按一定比例将不同基因型的纯系种子混合,以保持其一定的遗传平衡状态。所以,多系品种或混系品种一
Multi-line variety refers to a few pure lines or strains of seeds, according to a certain percentage mixed into a variety of sowing material groups. It also includes mixed or mixed varieties of two strains. The members of the mixed groups of species breed each year to breed the original species, according to a certain percentage, the members of the original seed mixture. One of the basic conditions for becoming a breed is that the genetic makeup of the population is in a state of equilibrium. If the genetic balance of this group is broken, breeds will degenerate. The multi-line species is based on the proportion of people each year by a certain percentage of different genotypes of pure lines mixed to maintain their genetic balance. Therefore, a variety of varieties or mixed varieties of a