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对烟草(Pn)的研究表明,烟草Pn存在极显著的品种间差异,Pn属微效多基因控制的数量性状。控制烟草Pn的基因数目最少在21对以上,核基因起主要作用,细胞质基因也有一定影响。Pn的遗传符合加性——显性模型,且显性效应的贡献大于加性效应的贡献,等位基因间高Pn基因对低Pn基因表现完全显性——起显性。F_1代Pn具有杂种优势,不同组合F_1代Pn的平均优势指数为104.56％,超高亲的优势率为1.35％。Pn的广义遗传力为35.10～65.59％,狭义遗传力为22.14～42.15％,F_2代Pn的表现型变异系数为15.66～18.40％,遗传型变异系数为9.02～12.60％,绝对遗传进度为2.00～3.64mgCO_2/dm~2·h,相对遗传时度为11.08～18.92％(K=2.06)。
Studies on tobacco (Pn) showed that there was a significant inter-species difference in Pn, and Pn was a quantitative trait controlled by the micro-multi-gene. The number of genes controlling tobacco Pn was at least 21 pairs, the nuclear genes played a major role, and the cytoplasmic genes also had a certain impact. The inheritance of Pn conforms to the additive-dominance model, and the contribution of the dominant effect is greater than that of additive effect. The high Pn gene between alleles is completely dominant to low Pn gene. The F1 generation Pn had the heterosis. The average superiority index of Pn in F_1 generation was 104.56% and the superiority rate was 1.35%. The general heritability of Pn ranged from 35.10% to 65.59%, and the narrow heritability ranged from 22.14% to 42.15%. The phenotypic variation coefficient of Pn in F_2 generation was 15.66% to 18.40%, the genetic coefficient of variation was 9.02% to 12.60%, and the absolute genetic progress was 2.00% 3.64mgCO_2 / dm ~ 2 · h, the relative genetic duration was 11.08 ~ 18.92% (K = 2.06).