PKV was a typical quantitative character, while HPV, BDV, CPV, SBV and CSV, each might be controled by a major gene and several minor genes.

• PKV是典型的由微效多基因控制的数量性状，HPV、BDV、CPV、SBV和CSV都可能是由一对主效基因和若干微效基因共同控制的。