Candidate screening of blast resistance donors for rice breeding.

In this study, a panel of 80 released varieties from National Rice Research Institute, Cuttack was genotyped with 36 molecular markers that were linked to 36 different blast resistance genes, to investigate the varietal genetic diversity and molecular marker-trait association with blast resistance. The polymorphism information content of 36 loci varied from 0.11 to 0.37 with an average of 0.34. The cluster analysis and population structure categorized the 80 National Rice Research Institute released varieties (NRVs) into three major genetic groups. The principal co-ordinate analysis displays the distribution of resistant and moderately resistant NRVs into different groups. Analysis of molecular variance result demonstrated maximum (97%) diversity within populations and minimum (3%) diversity between populations. Among tested markers, two markers (RM7364 and pi21_79-3) corresponding to the blast resistance genes (Pi56(t) and pi21) were significantly associated and explained a phenotypic variance of 4.9 to 5.1% with the blast resistance. These associated genes could be introgressed through marker-assisted to develop durable blast resistant rice varieties. The selected resistant NRVs could be good donors for the blast resistance in rice crop improvement research.
PMID: 31544777 [PubMed - in process]

Source: Journal of Genetics - August 31, 2019 Category: Genetics & Stem Cells Authors: Yadav MK, Aravindan S, Ngangkham U, Prabhukarthikeyan SR, Keerthana U, Raghu S, Pramesh D, Banerjee A, Roy S, Sanghamitra P, Adak T, Priyadarshinee P, Jena M, Kar MK, Rath PC Tags: J Genet Source Type: research