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Accueil du site → Doctorat → Inde → 2015 → Genetic architecture of yield and drought tolerance traits among genetically diverse lines of rice O sativa L

Banaras Hindu University (2015)

Genetic architecture of yield and drought tolerance traits among genetically diverse lines of rice O sativa L

Ram, Mukh

Titre : Genetic architecture of yield and drought tolerance traits among genetically diverse lines of rice O sativa L

Auteur : Ram, Mukh

Université de soutenance : Banaras Hindu University

Grade : Doctor of Philosophy (PhD) 2015

Résumé partiel
Rice is one of the most popular and widely grown crop throughout the world. The present investigation on “Genetic architecture of yield and drought tolerance traits among genetically diverse lines of rice (O. sativa L.)” under water stress Condition was undertaken with the experimental materials consists of one hundred twenty three diverse rice genotypes. Keeping in view the above facts, it would be worth to undertake this study to identify stable and high yielding varieties possessing desirable qualities which can thrive well under drought stress with following objectives : (i) To Screen and evaluate rice germplasm for drought tolerance. (ii) To estimate the components of genetic variation and their proportion. (iii) To assess the extent of molecular diversity among diverse rice germplasm. (iv) To assess the distribution of genes among the parents & nature of dominance. (v) To estimate the general and specific combining ability variance and effects. (vi) To study the nature and magnitude of heterosis and inbreeding depression.

In molecular diversity study, out of 28 SSR markers, RM20, RM316, RM170, and RM480 showed higher PIC value. Therefore, these markers could be used in further for improvement of drought tolerance/resistance in rice. The clustering of all the genotypes was according to their pedigree and drought resistance nature and other morphology and based on these, all the genotypes were grouped broadly into seven clusters. The major cluster, cluster II consisted of a total of 38 genotypes.

The days to maturity, chlorophyll content, proline content, relative water content, grain yield and leaf rolling is most important attributes for screening of rice germplasm under drought stress condition. On the basis of these morphophysiological traits and correlation with molecular diversity, the 9 genotypes (3 highly tolerant, 3 moderately tolerant and 3 susceptible for drought tolerance) which performed better with respect to yield and yield contributing traits under water stress condition were selected for the further genetic analysis for the improvement of the rice crop. Nine selected genotypes were crossed to produce 36 F1’s (excluding reciprocals) in diallele mating design.

Présentation et version intégrale (Shodhganga)

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