Quantitative Genetic Analysis of Agronomic and Morphological Traits in Sorghum, Sorghum bicolor

Mohammed, R and Ashok Kumar, A and Ramaiah, B and Munghate, R S and Kavi Kishor, P B and Sharma, H C (2015) Quantitative Genetic Analysis of Agronomic and Morphological Traits in Sorghum, Sorghum bicolor. Frontiers in Plant Science, 6 (945). 01-41. ISSN 1664-462X

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The productivity in sorghum is low, owing to various biotic and abiotic constraints. Combining insect resistance with desirable agronomic and morphological traits is important to increase sorghum productivity. Therefore, it is important to understand the variability for various agronomic traits, their heritabilities and nature of gene action to develop appropriate strategies for crop improvement. Therefore, a full diallel set of 10 parents and their 90 crosses including reciprocals were evaluated in replicated trials during the 2013-14 rainy and postrainy seasons. The crosses between the parents with early- and late-flowering flowered early, indicating dominance of earliness for anthesis in the test material used. Association between the shoot fly resistance, morphological and agronomic traits suggested complex interactions between shoot fly resistance and morphological traits. Significance of the mean sum of squares for GCA (general combining ability) and SCA (specific combining ability) of all the studied traits suggested the importance of both additive and non-additive components in inheritance of these traits. The GCA/SCA, and the predictability ratios indicated predominance of additive gene effects for majority of the traits studied. High broad-sense and narrow-sense heritability estimates were observed for most of the morphological and agronomic traits. The significance of reciprocal combining ability effects for days to 50% flowering, plant height and 100 seed weight, suggested maternal effects for inheritance of these traits. Plant height and grain yield across seasons, days to 50% flowering, inflorescence exsertion and panicle shape in the postrainy season showed greater specific combining ability variance, indicating the predominance of non-additive type of gene action/epistatic interactions in controlling the expression of these traits. Additive gene action in the rainy season, and dominance in the postrainy season for days to 50% flowering and plant height suggested G X E interactions for these traits.

Item Type: Article
Divisions: RP-Dryland Cereals
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Sorghum, Combining ability, Heritability, Agronomic traits, Morphological traits, GCA, SCA, Grain yield
Subjects: Mandate crops > Sorghum
Depositing User: Mr Ramesh K
Date Deposited: 28 Oct 2015 09:12
Last Modified: 21 Oct 2016 04:53
URI: http://oar.icrisat.org/id/eprint/9103
Official URL: http://dx.doi.org/10.3389/fpls.2015.00945
Acknowledgement: This article is part of the research topic: Crop traits for defense against pests and disease: durability, breakdown and future prospects
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