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Accueil du site → Doctorat → Inde → 2012 → Molecular marker analysis for yield and yield component traits under non stress and drought stress conditions in groundnut arachis hypogaea l

Tamil Nadu Agricultural University (2012)

Molecular marker analysis for yield and yield component traits under non stress and drought stress conditions in groundnut arachis hypogaea l

Priyadharshini M. 

Titre : Molecular marker analysis for yield and yield component traits under non stress and drought stress conditions in groundnut arachis hypogaea l

Auteur : Priyadharshini M. 

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) 2012

Résumé partiel
In the present investigation, the RILs population of TMV 2 x COG 0437 with their parents were evaluated under three seasons viz., kharif 2010, rabi 2010-11 and kharif 2011 under non stress and drought stress condition. Detailed studies were carried out in the mapping population for kernel yield and associated yield traits by means of performance, variability and stability parameters. Linkage map construction, single marker analysis and composite interval mapping were also carried out with SSR markers for quantitative traits. Studies on per se performance with 241 RILs population revealed that seven progenies recorded superior mean with COG 0437 for kernel yield/plant. However it had significantly superior mean performance than TMV 2 for kernel yield/plant. These progenies also expressed superior mean performance for pod yield/plant number of pods/plant and shell weight. In drought stress condition, six progenies exhibited significant high per se performance for kernel yield/plant than the better parent TMV 2. Those progenies had significant superior mean performance for pod yield/plant, number of pods/plant, SLA and shell thickness. Considering the per se performance of RILs progenies in both non stress and drought condition, the progenies # 85 and 177 were considered as superior as they recorded superior kernel yield/plant and component traits.Variability studies of phenotypic and genotypic coefficient of variation exhibited wide range for all characters. Number of pods/plant, pod yield/plant and kernel yield/plant recorded high PCV and GCV in both non stress and drought stress conditions in all three seasons. High heritability coupled with high genetic advance as percent of mean recorded for pod yield/plant and kernel yield/plant in season I and III under both non stress and drought stress conditions. Studies on skewness and kurtosis revealed that positive skewness was observed for SPAD in season I under non stress condition. Number of pods/plant, shell weight, shell thickness and LLS recorded positive skewness under drought stress condition in season II. In season III, SLA alone expressed positive skewness under both stress conditions. In case of kurtosis, lepto kurtic nature was observed for number of pods/plant, shell weight, shelling per cent, SPAD, pod yield/plant and kernel yield/plant in season I under non stress condition, where as in season II all traits had meso kurtic nature. Hence directional selection could be practiced for the improvement of kernel yield and component traits

Présentation et version intégrale (Shodhganga)

Page publiée le 18 avril 2021