Lodging is one of the most important factors that affect wheat final yield. Emmer [Triticum turgidum subsp. dicoccum (Schrank ex Schübl.) Thell.] is a likely gene source to improve durum wheat [T. turgidum L. subsp. durum (Desf.) Husn.]; however, it is highly susceptible to lodging. The genetic studies of traits related to lodging in crosses of durum × emmer remains largely understudied. Here, we used progenies (six generations) derived from two crosses of durum × emmer in a generation means analysis (GMA) to determine gene action, inheritance, and genetic gain from selection in respect to plant height and its related traits. The results indicated that lodging resistance was significantly and negatively correlated with plant height and positively correlated with grain yield and mainly influenced by stem diameter. GMA results indicated that epistasis did not play an essential role in the genetic control of lodging related traits and almost the major portion of the genetic variation in these crosses resulted from additive gene actions. Also for all of the studied traits, the additive variance was higher than the dominance one. Narrow sense heritability was higher than 0.60 for most of the traits, and the genetic gain after one cycle of selection was positive for plant height and its components in both crosses. It was found that, selection in early generations may result in simultaneous reduction of plant height and increased stem diameter to improve lodging resistance in durum × emmer crossings.

倒伏是影响小麦最终产量的最重要因素之一。二粒小麦 [Triticum turgidum subsp. dicoccum (Schrank ex Schübl.) Thell.] 是改良硬粒小麦 [T. turgidum L. subsp. durum (Desf.) Husn.]; 然而，它很容易受到住宿的影响。与硬粒小麦×二粒小麦杂交的倒伏相关性状的遗传研究在很大程度上仍未得到充分研究。在这里，我们在世代均值分析 (GMA) 中使用来自硬粒小麦和二粒小麦两个杂交的后代（六代）来确定基因作用、遗传和从植物高度及其相关性状的选择中获得的遗传增益。结果表明，抗倒伏性与株高呈显着负相关，与籽粒产量呈正相关，主要受茎粗的影响。GMA 结果表明，上位性在倒伏相关性状的遗传控制中没有发挥重要作用，而且这些杂交中的大部分遗传变异几乎都是由加性基因作用引起的。同样对于所有研究的性状，加性方差高于优势性状。大部分性状的狭义遗传力均高于0.60，两个杂交的株高及其组分经过一个循环选择后的遗传增益均呈正值。结果发现，早代选择可能导致株高同时降低和茎粗，以提高硬粒小麦×二粒小麦杂交的抗倒伏性。