烟草主要数量性状的遗传效应分析

利用红花大金元×青梗,红花大金元×中烟14号P1、P2、F1、F2、B1、B2 6个世代资料对7个农艺性状和4个品质性状进行了基因效应分析。结果表明,性状均不符合简单的加性－显性遗传模型,多数性状加性效应显著而显性效应不显著,在3种互作效应中,所有性状至少有一种显著。互作效应普遍存在,是烟草性状杂种优势表现的主要原因之一。 Abstract:Two tobacco F1 hybrids,F2s,backcrosses B1s and B2s and their parents P1 and P2 were used to estimate the gene effects for 7 agronomic and 4 quality characters.The additive-dominance genetic model was not fit for all characters.The additive effects and the epistatic effects of most characters were significant,but the dominant effect not.The epistatic effects could not be ignored in tobacco breeding.They were one of main causes of heterosis for most characters.