Deciphering genetic diversity in ‘Antenna Panel’ genotypes of IRRI’s Global Rice Array-IV for yield traits in Indo-Gangetic Plains
Abstract
International Rice Research Institute (IRRI) has launched a flagship project-4 consisting of 58 rice genotypes ‘Antenna Panel’ (a panel of diverse genotypes having various beneficial genes introgressed) from the Global Rice Array-IV (GRA-IV). Exploring diversity provides an opportunity for plant breeders to develop resilient crops and analysis of diversity is important for any crop improvement programme. Mahalanobis’s distance matrix thus obtained was further subjected to clustering by the UPGMA hierarchical agglomerative clustering method to decipher the degree of genetic divergence in the ‘Antenna Panel’ genotypes of IRRI’s Global Rice Array-IV. On the basis of D2 values, rice genotypes were grouped into eleven clusters. Cluster I was the largest and contained the maximum number of genotypes. The inter-cluster distance ranged from 5.8 between cluster I and cluster VIII to 18.8 between cluster V and cluster X. The highest inter cluster distance was recorded between clusters V and X (18.80) followed by clusters II and V (17.78). The intra cluster distance was found to be maximum in cluster II (5.20) followed by cluster V (5.01), and cluster I (4.25). The character days to 50% flowering (33.1%) showed a maximum contribution followed by plant height (30.2%), grain yield (10.3%), the number of grains per panicle (10.00%), panicle length (7.3 %), the number of tillers per plant (4.8%) and 1000-grain weight (4.3%). If a superior genotype with an ample amount of genetic divergence and well adapted in India’s Indo-Gangetic Plains can be selected, from these global databases then it can be of great help to break the stagnation of yield by improving the genetic potential of the existing rice varieties through hybridization and exploitation of heterosis. In this context, if hybridization is attempted between the genotypes included in the cluster V (SUPA, ZANTON::IRGC 31248-1 and URAIBOOL::IRGC 52785-1) and cluster X (Hokkai 188, M202) greater heterosis can be expected.
Keywords: Rice genotypes, Genetic Divergence, IRRI, D2
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.
