Assessment of genetic diversity among the maintainer and restorer inbreds of sunflower (Helianthus annuus L.)
Sunflower (Helianthus annuus L.) is one of the most important oilseed crops grown worldwide because of its supreme oil quality and commercial importance. Assessment of diversity among inbreds is a vital prerequisite to select parents for a hybridization programme. Hence, in the present investigation, the genetic divergence of 29 genotypes consisting of both maintainer and restorer inbreds was studied using Mahalanobis (D2) analysis. Genotypes were grouped into eight clusters, in which cluster I was the largest with 13 genotypes. Clusters IV, VI, VII and VIII were the smallest, with one genotype each. The maximum intracluster distance was observed in cluster I followed by II. Maximum inter cluster distance was recorded between clusters II and V followed by clusters II and VII. Days to 50% flowering had the maximum contribution (32.76%) for genetic divergence. Superior mean performance for head diameter, 100 - seed weight, seed yield per plant and oil content was observed in cluster VI whereas earliness in terms of days to 50% flowering and days to maturity was observed in cluster II. Cluster VIII recorded superior mean performance for volume weight and the lowest mean plant height was observed in cluster VII. Hence, hybridization between cluster II (CMS 10B, HA 89B, RHA-1-1) and cluster V (CMS 519B, HA 430B) could create more variability in the segregating generations.
Key words: Sunflower, genetic diversity, inbreds, maintainer, restorer.
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.