Combining ability analysis for drought tolerance in rice (O. sativa L.) under reproductive stage
Abstract
An investigation in rice (Oryza sativa L.) was carried out to study the nature of gene action governing drought tolerant and yield contributing traits under reproductive stage drought stress. Nine genotypes from varied sources including land races, pre-release cultures, drought tolerant varieties and tropical japonica types were crosses in diallel analysis. The results indicated that predominant role of dominance gene action for all the drought tolerant traits except leaf drying and all the yield contributing traits except days to 50% flowering and plant height. Additive gene action was predominant for plant height, while both additive and dominance gene actions were equal in magnitude for days to 50% flowering and leaf drying. The parents viz., CT 9993, Moroberekan, Nootripathu, Kallurundaikar, PMK 2 and Norungan are found to be promising in producing superior segregants for physiological and morphological mechanisms of drought tolerance along with grain yield. The hybrids Nootripathu / Moroberekan, Nootripathu / CT 9993, MDU 5 / Moroberekan, CPMB ACM 04001 / Moroberekan, CPMB ACM 04001 / CT 9993 and PMK 2 / Kallurundaikar could be recommended for recombination breeding to get useful segregants for yield and drought tolerance. Based on per se, sca effects and standard heterosis, the hybrids MDU 5 / CT 9993, Nootripathu / Moroberekan, Kallurundaikar / Moroberekan, Kallurundaikar / CT 9993, PMK 2 / Moroberekan and Norungan / Nootripathu are ideal for heterosis breeding.
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.
