Combining ability studies for heat tolerance traits in bread wheat [Triticum aestivum (L.) em. Thell]
Abstract
A set of 28 hybrids were developed involving eight diverse parents (HD 2687, DBW 17, PBW 373 ,Raj 3765, Raj 3077, Raj 4037, Raj 4083and RKA 501) by using diallel mating system without reciprocals. The 28 F1’s and 8 parents were grown in Randomized Block Design with two replications during rabi 2008-09. Analysis of variance revealed that variance due to genotypes, parents, parents vs. crosses and crosses were highly significant and significant for all the traits studied. Significant mean squares due to general combining ability and specific combining ability in pooled analysis revealed significance of both additive and dominance gene effects in inheritance of all the heat tolerance traits in wheat. The low predictability ratio revealed that all the characters studied were predominantly controlled by non- additive genes action. The present study has identified desirable parents RKA 501, PBW 373, Raj 3077, Raj 3765 and HD 2687 for most of the heat tolerant parameters. The importance of additive but mainly non-additive gene action is highlighted. Improvement in heat injury and other heat tolerant parameters should be possible by resorting to biparental mating followed by recurrent selection or by diallel selective mating.
It is certified that:
- The corresponding author is fully responsible for any disputes arising due to the publication of his/her manuscript.
- The article has been seen by all the authors who are satisfied with its form and content.
- The sequence of names of authors in the by-line is as per their relative contribution to this experiment, giving due credit to all scientists who made notable contribution to it.
- All the authors fully understand that inclusion of any other co-authors or exclusion of any co-authors is not possible once the article has been submitted to the journal.
- The corresponding author takes full responsibility for this article.
- The address of the organization where the research was conducted is given.
- The article is exclusive for this journal, and the results reported here have not been sent (and will not be sent during its consideration by this journal) for publication in any other journal.
- Authors agree to abide by the objective comments of referees and do agree to modify the article into a short note as per the recommendation, for publication in the Electronic Journal of Plant Breeding.
- If published in Electronic Journal of Plant Breeding, the copyright of this article would vest with the Indian Society of Plant Breeders, who will have the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in it, and neither we nor our legal heirs will have any claims on royalty.
