IDENTIFICATION OF DROUGHT TOLERANT GENOTYPE BASED ON DROUGHT INDEX IN RICE (Oryza sativa L.)

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dc.contributor.advisorVerma, Sunil Kumar
dc.contributor.authorSahu, Vinod Kumar
dc.contributor.otherVerulkar, S.B.
dc.contributor.otherKhokhar, D.
dc.contributor.otherSaxena, R.R.
dc.date.accessioned2022-01-06T08:33:46Z
dc.date.available2022-01-06T08:33:46Z
dc.date.issued2021
dc.descriptionIDENTIFICATION OF DROUGHT TOLERANT GENOTYPE BASED ON DROUGHT INDEX IN RICE (Oryza sativa L.)en_US
dc.description.abstractIn both rainfed and poorly irrigated rice habitats, drought stress is the most common cause of yield loss and production stability. The development of cultivars with better drought resistance is thus a critical component in boosting production and relieving poverty in rainfed ecosystem-dependent populations. The development of drought tolerance varieties is complicated by the complex nature of drought tolerance, genotype x environment interactions, a lack of understanding of drought tolerance inheritance, a lack of understanding of the physiological basis of yield under water-limited conditions, inefficient phenotypic selection, and the difficulty of effective drought tolerance screening. The present investigation entitled “IDENTIFICATION OF DROUGHT TOLERANT GENOTYPE BASED ON DROUGHT INDEX IN RICE (Oryza sativa L.)” was out carried during 2020-21. 200 rice genotypes were evaluated under irrigated and terminal stage drought condition at Department of Plant Molecular Biology and Biotechnology, College of Agriculture, IGKV, Raipur, (C.G.), 492012. The phenotypic data were analyzed to find QTLs linked to the drought susceptibility index (DSI). The variability parameters show how the characteristics differ. When compared to normal, the population's mean yield performance shows a significant fall in grain output under drought conditions. The yield of rice under irrigated was ranging from 66.67 to 5133.33 kg/ha with the grand mean of 1392.92 kg/ha whereas, in case of drought it was 0 to 596.15 kg/ha with the grand mean of 54.39 kg/ha. It reveals that the DII (0.95) value more than 0.5 (meaning a loss of more than 50% yield from a controlled or normal environment to a stressed one) indications higher limits of stress. Drought-resistant genotypes have a DSI of less than one (unit), with yield decrease observed for all genotypes. All of the genotypes had a positive DSI, indicating that they were susceptible to drought stress. The most drought-tolerant lines were recorded with the greatest drought yield index (DYI). Line Number IR17L1477 having high yielding (5.87) with low DSI value (0.73), can be used for further breeding program. Based on DSI, DYI and yield 48 rice genotypes were selected for future molecular validation out of which 24 were resistant genotype 24 were susceptible genotypes. The results reveal that polymorphic marker run in 48 lines in which any markers are not given clearly segregation because yield is polygenic trait and its governed by number of gene and different line containing different QTLs for drought marker RM 7195 showing less recombination.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810180433
dc.keywordsDROUGHT TOLERANT; GENOTYPE; DROUGHT INDEX; RICE (Oryza sativa L.)en_US
dc.language.isoEnglishen_US
dc.pages99p.en_US
dc.publisherINDIRA GANDHI KRISHI VISHWAVIDYALAYA RAIPUR (Chhattisgarh)en_US
dc.research.problemIDENTIFICATION OF DROUGHT TOLERANT GENOTYPE BASED ON DROUGHT INDEX IN RICE (Oryza sativa L.)en_US
dc.subBiotechnology and molecular Biologyen_US
dc.themeIDENTIFICATION OF DROUGHT TOLERANT GENOTYPE BASED ON DROUGHT INDEX IN RICE (Oryza sativa L.)en_US
dc.these.typeM.Scen_US
dc.titleIDENTIFICATION OF DROUGHT TOLERANT GENOTYPE BASED ON DROUGHT INDEX IN RICE (Oryza sativa L.)en_US
dc.typeThesisen_US
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