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Accueil du site → Doctorat → Inde → 2004 → Genetic analysis and screening for drought tolerance in dual purpose sorghum sorghum bicolor l moench

Tamil Nadu Agricultural University (2004)

Genetic analysis and screening for drought tolerance in dual purpose sorghum sorghum bicolor l moench

Mohanraj K.

Titre : Genetic analysis and screening for drought tolerance in dual purpose sorghum sorghum bicolor l moench

Auteur : Mohanraj K.

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) in Plant Breeding and Genetics 2004

Résumé partiel
An investigation was carried out with six lines and four testers of grain and forage sorghum genotypes and crossed in line x tester design to produce 24 hybrids. The resultant hybrids and parents were evaluated for identifying potential parents based on their gca effects and isolation of superior crosses on the basis of sca effects for yield and quality traits. The parents and hybrids were also screened for their relative drought tolerance under green house condition. Six F2 families involving various combinations of parents (good and poor combiners) were evaluated to understand the influence of gca effects on its performance and to isolate superior segregants for grain and forage yield. There was preponderance of SCA variance over the GCA variance for all the characters suggesting the predominant role of non-additive gene action. Among the parents, the line CO 28 recorded positive and significant gca effects for 12 out of 20 characters namely Leaf length, leaf breadth, stem girth, leaf / stem ratio, panicle length, panicle weight, number of primary branches, 100 seed weight, grain yield per plant, HCN content, crude protein content (grains) and starch content and it was adjudged as the best parent. The line IS 6354 recorded significant gca effects for both green fodder yield and grain yield per plant and it was identified as best general combiner for these traits. Based on per se performance and gca effects, the lines CO 28 and IS 6354 and tester TNS 52 were identified as best parents for most of the grain cum forage yield and its contributing traits. Among the hybrids, CO 28 x IS 0030 was identified as the best hybrid since it possessed desirable per se performance, sca and heterosis for grain yield per plant in addition to panicle length, panicle weight, number of primary branches and starch content. The hybrid IS 6354 x TNS 52 was the next best hybrid for grain yield per plant, plant height, panicle weight and leaf / stem ratio

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Page publiée le 23 avril 2021