Combining ability and maternal effects in Brassica campestris L. var. ?yellow sarson?

Abstract

A diallel analysis of combining ability, including maternal effects, genotype X environment interaction and the progress under selection, is reported in three selected crosses of Brassica campestris L. var. 'yellow sarson', involving 15 types, including 10 four-valved and 5 two-valved types from different parts of India. Twelve characters, including oil content, were studied in the f1 generation.The investigation has revealed only marginal superiority of f1's over the parents for most of the characters related to yield. There was no relation between heterozygosity and stability of performance over environments for yield or its components or for oil content. Substantial maternal effects were observed which also interacted with environments. Creation of variation for primary and secondary branches would be essential for changing yield level in 'yellow sarson'. The presence of limited additive variation available for selection for yield components should be augmented by biparental mating the early segregating generations to break linkages, and was demonstrated by the recombinants obtained when this method was adopted.The magnitude of genotype - environment interactions in this study, as compared with the total genetic components for yield, oil content, number of siliquae on main axis and presence of large reciprocal variances in relation to general and specific combining ability variances for practically all characters, and the large interaction of [Formula: see text], narrowed down the expected effectiveness of selection.Biparental mating in the three best crosses yielded three new recombinants outyielding the best check T 10 by the margins of 14%, 39% and 15%, respectively, in the yield trial. These recombinants had more primary branches and secondary branches, larger main axes and more siliquae with an increased number of seeds per siliqua, than any of the F1's in this study.

Combining Ability Analysis: Morphological Traits for High Temperature Stress Tolerance in Indian Mustard [Brassica juncea (L.) Czern & Coss.]

“…Crosses, RH 0735 x RH0644 in normal environment and BPR 349-9 x BPR543-3, RH 8814 x BPR 349-9 in late sown environment for siliquae on main shoot, BPR349-9xBPR543-3, RH 0116 x RH0952 in normal environment and RH 8814 x RH 0116, BPR 349-9 x RH0952 in late sown environment for number of seeds per siliqua and siliqua length were expressed significant highest positive sca effects. Our findings are in agreement with the earlier results in mustard reported by Singh and Murty (1980), Sheikh and Singh (1998) and Chowdhury et al, (2004a).The magnitude of sca effects for seed yield/plant revealed in crosses viz., RH 8814 x RH0555A, RH 0116 x RH0952, BPR 349-9 x RH0644, BPR 349-9 x BPR543-3 and RH0952 x RH0555A in both the environments, seven crosses in normal and late sown environment showed significant positive sca effects. Teklewold et al, (2005), Nassimi et al, (2006) and Wang et al, (1997) observed significant positive sca effect for seed yield.…”

Breeding of Brassica rapa for Biogas Production: Heterosis and Combining Ability of Biomass Yield

“…However, Singh and Murty [18] in B. rapa observed a higher crosses×environment variance compared to the parents×environment and concluded, that stability of a cultivar is influenced not only by heterozygosity. The correlations among traits are important for selection.…”

“…Singh and Murty [18] in B. rapa subspecies yellow sarson observed predominance of non additive genetic effects. Wang et al [21] among different subspecies of B. rapa observed the importance of general combining ability and specific combining ability in controlling different traits.…”

Field Performance and Genetic Analysis in Some Advanced Lines of Mustard (<i>Brassica rapa</i> L.)

“…Akter (2010) supported the result as he also found high heritability (89.65%) and low genetic advance (3.50%). Moderately high heritability coupled with low genetic advance was also found by Singh et al (1987).…”