Quantitative-genetic parameters of sorghum (Sorghum bicolor (L.) Moench) grown in semi-arid areas of Kenya

Haussmann, B.I.G. and Obilana, A.B. and Ayiecho, P.O. and Blum, A. and Schipprack, W. and Geiger, H.W. (1999) Quantitative-genetic parameters of sorghum (Sorghum bicolor (L.) Moench) grown in semi-arid areas of Kenya. Euphytica, 105 (2). pp. 109-118.

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To estimate quantitative-genetic parameters for sorghum under variable stress conditions, three sets of factorial crosses between 8 lines were grown with parents and a local cultivar in 8 macro-environments in semi-arid areas of Kenya. Fourteen traits were recorded including grain yield, above-ground dry matter, harvest index, days to anthesis, leaf rolling score, and stay-green. Environmental means for grain yield ranged from 167 to 595 g m-2. Mean heterosis over mid-parent values was 47, 31, and 9% for grain yield, above-ground dry matter, and harvest index, respectively. Differences among both lines and hybrids were highly significant for all traits. Genotype environment interaction variances were larger than genotypic variances for grain yield, above-ground dry matter, and harvest index. Corresponding heritabilities ranged between 0.72 and 0.84. Variation among hybrids was determined by GCA and SCA effects for most characters. Predominance of additive-genetic effects was found for grain yield components, plant height, and leaf rolling score. Lack of variation in GCA was noted among female lines for major performance traits. While low leaf rolling score was correlated with high grain yield, there was no such association for stay-green. Hybrid breeding could contribute to sorghum improvement for semi-arid areas of Kenya. To increase selection progress for major performance traits, genetic variation among female lines should be enhanced. Importance of genotype environment interaction underlines the necessity of evaluating breeding materials under a broad range of dryland conditions

Item Type: Article
Author Affiliation: Institute of Plant Breeding, Seed Science, and Population Genetics, University of Hohenheim, D-70593 Stuttgart, Germany
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 23 Feb 2011 17:37
Last Modified: 23 Feb 2011 17:37
Official URL: http://dx.doi.org/10.1023/A:1003469528461
URI: http://eprints.icrisat.ac.in/id/eprint/1537

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