Genetic diversity in the rice landraces (Oryza sativa L.) of coastal Sundarbans (India) and their adaptation to the local saline condition investigated both at molecular and physiological level
2016
Samal, Rashmita | Roy, Pritesh Sundar | Dash, Amit Kumar | Rao, Gundimeda Jwala Narsimha | Bharathkumar, Srinivasan | Subudhi, Hata Nath | Reddy, Janga Nagi
Salinity is one of the major impediments to increase production in rice growing areas worldwide as the crop is sensitive to saline conditions. The key to breed new rice varieties depends on utilization of genetic diversity in landraces that possess many useful genes/alleles. The diversity present among the fifty rice accessions, collected from 4 geographical areas of Sundarbans, India, an area well known for its genetic diversity, was analysed at the genomic level by employing hyper variable microsatellite markers. As these accessions are well adapted to saline conditions, haplotype analysis conducted on Saltol locus, which has four genes that are known to confer salinity in rice, could identify eight different haplotypes. Wide variation was also seen for Na⁺/K⁺ ratio among the accessions and an association was detected between markers RM8094, RM3412 and RM493 and Na⁺/K⁺ ratio of rice plants under salinity stress. Based on the morphological, physiological and molecular analyses, Nonabokra, Kumrogoor and Kalonunia were identified as potential donors as the tolerance in these genotypes appear to be regulated by alleles other than the ones present in FL478, a well-known donor for salinity in rice.
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