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以高粱和苏丹草为试材，对旗叶鞘长及穗柄长进行遗传分析，结果表明，仅旗叶鞘长符合加性—显性模型，为部分显性。基因效应的方差分量分析结果显示，旗叶鞘长以加性效应为主，占９２．８％；穗柄长除加性外另有３５．７％的非加性效应，二者都易受环境条件的影响。穗柄长的杂种优势值高于旗叶鞘长。二者在遗传以及表型上均无显著相关性。旗叶鞘长在Ｆ２平均值与中亲值有显著的正相关，变异程度小。二者在高粱×苏丹草Ｆ２中有细胞质的影响
Sorghum and Sudangrass were taken as test materials to carry out genetic analysis of the flag leaf sheath length and ear length. The results showed that only the leaf sheath length coincided with the additive - dominant model and was partly dominant. The results of variance component analysis of gene effect showed that the length of flag leaf sheath was mainly additive effect, accounting for 92.8%. In addition to the additive effect of ear length, there were 35.7% non-additive effect, both of which were susceptible to environment Conditions of influence. Spike length of the heterosis is higher than the flag leaf sheath length. There was no significant genetic and phenotypic correlation between them. There was a significant positive correlation between the mean value of flag leaf sheath and mid-value of F2, and the degree of variation was small. Both of them had cytoplasmic effects in sorghum × sudangrass F2