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Not AvailableTwenty four genotypes of rice comprising landraces of Goa and improved cultivars were studied for genetic diversity on the basis of yield and its attributing characters. Based on D2 analysis, the 24 rice genotypes weregrouped into 6 clusters. Cluster I consisted maximum of 13 genotypes followed by Cluster III with six genotypes.The grouping of most of the landraces of Goa and few improved cultivars of rice into one cluster (III) indicates genetic relatedness among these genotypes. Cluster II had two genotypes, while the remaining clusters viz., Cluster IV, Cluster V and Cluster VI were represented by single genotypes each viz., Shidde, Saalsi and Kolyo respectively. Among different traits, days to 50% per cent flowering (38.77 %), 1000 grain weight (19.93), grain breadth (17.75) and plant height (14.86) had maximum contribution towards the total divergence.Not Availabl

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Not AvailableSalt stress is a major abiotic stress affecting the productivity of rice crop worldwide. This study screened a set of 71 rice genotypes collected from coastal parts of Goa and Karnataka states in India for seedling stage salinity tolerance to identify genotypes alternative to standard salt-tolerant donors Pokkali, FL478, etc. Phenotyping for seedling stage tolerance was carried out under micro plots at an induced salinity of 12 dS/m. For haplotyping, 14 Saltol QTL linked simple sequence repeat (SSR) markers on chromosome 1 were utilized. On the basis of the response to salt stress, 10 genotypes were found tolerant, 16 moderately tolerant, 29 sensitive and 15 as highly sensitive. Among the SSR markers, marker RM10871 was the most polymorphic with a polymorphic information content of 0.90, exhibiting 14 different alleles followed by RM10793 (0.84) and RM3412 (0.80) with 8 and 7 alleles, respectively. These markers also exhibited high values for the effective number of alleles (Ne) and gene diversity (I). The haplotype analysis revealed that the allelic constitution of the Saltol region of 10 tolerant genotypes from our study varied in comparison to the reference tolerant check FL478. Further, the haplotype of three tolerant genotypes, namely, Goa Dhan 2, Panvel 1 and Goa wild rice (GWR) 005 appears to be completely different from the FL478 haplotype indicating tolerance in these genotypes is controlled by genomic region other than Saltol. These three genotypes with probable novel regions for seedling stage salt tolerance can be considered for enhancing salinity tolerance of rice cultivars.Not Availabl