Combining ability analysis in bread wheat (Triticum aestivum (L.) Em. Thell) under different environmental conditions

Abstract

Pooled analysis of 8 genotypes of wheat of diverse origin, their 28 F1s and 2 checks was carried out in 4 different environments to study the combining ability in bread wheat for grain yield and its component traits. On pooled basis, analysis of variance due to GCA and SCA was significant for all characters revealed difference between parents for GCA and difference between crosses for SCA. Similarly, mean square due to GCA × E was significant for number of effective tillers per plant and flag leaf area revealed influence of environment on GCA. Whereas SCA × E was also significant for number of effective tillers per plant and grain yield per plant revealed influence of environment on SCA. The variance due to GCA was higher than their respective SCA for all characters except number of grains per spike indicating that additive type of gene action played role in the expression of all these traits. Significant GCA effects for grain yield and its component traits were exhibited by the parents HD 2987, Lok 1 and HI 1544. Fourteen crosses recorded showed significant SCA effects for grain yield and related traits.

Effect of heat stress on combining ability and heterosis in some bread wheat genotypes (Triticum aestivum L.)

“…This reduction may be due to the negative effect of high temperature on grain filing rate. These results are in line with those obtained by Dencic et al (2000), Hoffman and Burucs (2005), Mohamed (2007), Ahmed and Mohamed (2009a), Hassan (2015), Hassan (2016), Jaiswal et al (2017), Ahmed et al (2017), Sharma et al (2019), Bajaniya et al (2019) and Ali et al (2020).…”

“…Several wheat studies indicated that general and specific combining ability effects for some parental genotypes and hybrids were positive and highly significant for grain yield 2015, Mwadzingeni et al;2017, Ahmed and Mohamed;2009a, Nassar, 2013Jaiswal et al,2017;Sharma et al, 2019;Bajaniya et al, 2019;and Ali et al, 2020. Estimates of average better parent heterosis for grain yield in wheat ranged from 1.03 to 47.60%. Lower estimates were obtained with crosses of adapted parental genotypes (Ahmed and Mohamed, 2009a;Hassan, 2015 andAli et al, 2020), while the high values most often resulted from studies which involved exotic germplasm or which were performed under environmental stress conditions Mohamed, 2009a andHassan, 2015).…”

Combining ability in some genotypes of bread wheat (Triticum aestivum L.) under different sowing dates

“…Most of these hybrids were shorter than over all means, revealing that these crosses could be considered for breeding program for developing semi-dwarf under area conditions. Similar results were obtained by Ahmed, 2003, Ali, 2006, El-Karamity et al, 2007, Hassan 2015, Jaiswal et al (2017, Asmaa et al (2018), Sharma et al (2019) and Bajaniya et al (2019).…”

Benthic Macroinvertebrates and Physicochemical Variables of Streams in the Guli River National Wetland Park, Greater Khingan Mountains, Northeast China

“…Past studies on combining ability analysis revealed the ability and contribution of the parental cultivars to unite their positive genes in F1 and F2 progenies after hybridization (Kempthorne, 1957;Singh and Chaudhary, 1985;Verma et al, 2016). Earlier studies about combining ability revealed similar patterns of significance and inheritance for yield variables in wheat (Tabassum et al, 2017;Farooq et al, 2019;Parveen et al, 2019;Sharma et al, 2019;Ayoob, 2020). However, some of the diallel studies revealed nonsignificant variations among the populations for components of combining ability in bread wheat (Ljubicic et al, 2014).…”