Inheritance of plant height, straw yield and flag leaf area in MBB x Gaviota durum wheat (Triticum durum Desf.) cross

Abstract

<p class="042abstractstekst">Plant height, straw mass and flag leaf area are recognized by physiologists as morphological markers of drought stress tolerance. Developing varieties intended for arid and semi-arid zones need to select for these traits. Understanding the genetic control of a given trait helps breeder to handle the segregating populations under study in a more efficient and consistent manner by choosing the best breeding method available to realize significant genetic advance. For this purpose, six generations: parents, F1, F2, BC1, BC2, derived from MBB x ‘Gaviota’ durum wheat (<em>Triticum durum </em>Desf.) cross were grown to investigate the nature of gene action involved in the inheritance pattern of the three traits. The results indicated that the six-parameter model fitted the best the data related to the variability present in the generation means of the studied traits. Generation mean analysis indicated that non-allelic interactions were important factors controlling the expression of these characters with complementary type of gene action governing FLA and STW inheritance. High heritability estimates, moderate to high expected responses to selection, significant genetic correlations with grain yield and greater role of non-additive effects in controlling the inheritance of the three studied traits suggested that breeding methods exploiting both fixable and non-fixable components be applied to break unfavorable linkage and to accumulate useful genes in the base population, followed by mono-trait or index based selection in late advanced generations.</p>

Study on the Diversity of Genotypic Varieties of Durum Wheat (Triticum Durum Desf.) In the Sub-Humid Region of El Harrouch, Algeria

“…The highest straw yield is recorded by the "Ciccio" genotype with 138.9±14.82 q/ha, followed by "Sigus and Bouhamema" with 132.11±46.69 and 129.78±40.33 q/ha, while the other genotypes show values averages between 122.94±1.77 and 92.46±3 q/ha, whereas the "Mouleteddar and Cirta" varieties are ranked last with 81.72±9.66 and 70.56±1.5 q/ha, respectively (Table 5). Morphological characters, such as straw yield and plant height have been identified as morphological markers of drought tolerance (Salmi et al 2021). Morphological markers are effective ways to study wheat genetic diversity (Al Khanjari et al 2008, Kirouani et al 2019.…”

“…The aim of any genetic improvement program is to produce varieties with high and stable yield. Grain yield is a genetically complex trait and its improvement requires selection of productivity and adaptive traits to abiotic and biotic environments (Oulmi et al 2014, Fellahi et al 2017, Salmi et al 2021. Indeed, the new genotypes obtained are more often selected according to their performance without taking into account the adaptive characters (Laala 2010).…”