Heterosis and combining ability analysis in tetraploid cotton (G. hirsutumand and G. barbadense L.)
The present investigation was carried out with a view to study the heterosis, combining ability and gene action for seed cotton yield, yield attributing traits, ginning outturn and important fibre quality parameters in tetraploid cotton (G.hirsutumL. and G.barbadenseL.). A set of 31 genotypes consisting of 21 (HxB) hybrids, seven lines of G. hirsutum,three testers of G. barbadense andone check hybrid DCH 32was grown atRasi Seeds Research and Development Farm,Attur. The hybrids were developed adopting Line x Testermating design. Analysis of variance showed significant differences among the parents and hybrids for all the characters indicating presence of genetic variability. Combining ability analysis indicated that both additive and non additive gene effects were important in the inheritance of all the traits. The ratio of variance due to GCA to that of SCA was less than one for all the character under study indicating importance of dominance gene effects in the inheritance of these characters. The parents CG 64 (hirsutum),CG67 (hirsutum) and CG45SB (barbadense) were good general combiner for the seed cotton yield per plant and number of bolls per plant.CG 45SB was also a good combiner for the 2.5 per cent span length.The cross CG 64 x CG 45 SB recorded the highest per se performance and standard heterosis for seed cotton yield. Two crosses viz., CG64 x CG45SB and CG67 x CG45SB registered significant per se performance,positive scaeffects along with significant positive standard heterosis for seed cotton yield and majority of yield components and fibre quality traits.
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.