Abstract:

In order to understand the genetic effects and hybrid vigor potential of newly developed flue-cured tobacco cytoplasmic male sterile lines, twelve hybrids crossed among 3 cytoplasmic male sterile lines and 4 flue-cured tobacco varieties were used to determine the genetic effects in economic characters including stem height, leaf quantity, leaf length, leaf width, ratio of leaf length to width, stem girth, pitch and weight of single leaf. The results in the present paper showed that the 8 agronomic traits were largely affected by environment, and all had low heritability. The agronomic traits mainly controlled by interaction of dominance or addiction and environment. Stem height, leaf length, leaf width and ratio of leaf length to width had distinctly larger dominant effects than additive effects, while leaf quantity, stem girth, pitch and weight of single leaf had nearly the same dominant effects as additive effects. The 3 cytoplasmic male sterile lines, MsYZ203-6, MsYZ216-1and MsYZ206-9 with high dominant effects in agronomic traits had strong heterosis in their hybrids.