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An experiment with a total of 36 rice entries consisted of 28 cross and eight parental lines were evaluated to estimate the variability parameters for 10 yield attributing character, 6 physical quality traits; 8 cooking and chemical quality traits of rice cultures. Analysis of variance revealed the existence of significant differences among cultures for all traits studied. High PCV coupled with GCV was recorded for gel consistency and alkali spreading value revealed wider variability for these traits. Moderate PCV and GCV was observed for total number of tillers per plant, number of grains per panicle, LAI at maximum tillering stage, volume expansion ratio, water uptake, amylose content and grain yield per plant indicating the moderate variability. High heritability coupled with high genetic advance as per cent of means for total number of tillers per plant, number of grains per panicle, leaf area index at maximum tillering stage, water uptake, gel consistency, alkali spreading value, amylose content and grain yield per plant, revealed the role of additive gene effect and simple selection procedures may be effective for improving these traits. High heritability coupled with moderate genetic advance as per cent of mean was observed for days to 50% flowering, days to maturity, plant height, test weight, kernel breadth after cooking and volume expansion ratio, revealed that role of both additive and non-additive gene effects in the inheritance of these traits.

Background: Anaerobic germination is an important trait in particular for cultivation under direct seeding method in kharif season, as well as during nursery rising for transplant rice, as sometimes unexpected rains immediately after sowing will drastically reduce the plant population.Methods and Results: In the present investigation phenotypic screening for Anaerobic germination (AG) was carried out using 188 F2:3 population of Swarna Sub1/AC39416A at RARS (APRRI), Maruteru. The mean anaerobic germination per cent recorded after the two weeks of submergence ranged from 0% to 95% with overall mean of 47.51% whereas, for three weeks of submergence, the mean anaerobic germination per cent recorded between 0 and 95%, with overall mean of 37.66%. 134 (19.42%) out of 687 Simple Sequence Repeats (SSR) markers surveyed were polymorphic between the parents. Linkage analysis was done with 83 SSR markers showing polymorphism clearly using the integrated software called QTL IciMapping software version 4.1.0. The length of linkage map constructed across whole genome was 3600.8 cM and identified seven QTLs viz., qAG2, qAG3, qAG7-1, qAG7-2, qAG9, qAG10 and qAG12. All these seven QTLs explained phenotypic variance of about 37.47% collectively for AG trait, with their individual contributions ranging from 3.5% to 8.67% of phenotypic variation and LOD scores of 2.6 to 5.86. The LOD score and phenotypic variance is 5.86 and 8.67% respectively for qAG10 a novel QTL identified in the present study using ICIM method. Conclusion: QTL “qAG12-1” identified in this study may be considered for introgression into popular elite rice varieties otherwise susceptible for anaerobic germination after fine mapping studies.

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