Genotypic variation of Sorghum bicolor (L.) Moench in response to different cropping systems

Abdulai, M.S. (2006) Genotypic variation of Sorghum bicolor (L.) Moench in response to different cropping systems. Journal of Agronomy, 5 (4). pp. 634-640.

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This study utilized 400 S1 progenies or families and cycle bulks from two random mating populations planted in sole and in intercropping with soybean variety Pella-84. The objectives were to compare half-sib and S1 methods of selection for developing sorghum varieties and the nature of genotypes suitable for different cropping systems. Statistical significance tests showed that the progenies were different both within populations and between the populations. The progenies or families selected for sole cropping systems were later to flower than those selected for intercropping system. However, intercropping increased the days to flowering and maturity. Total yields were higher in intercropping due to the additional harvest of the soybean components. The ranking of the S1-families based on total grain yield in sole cropping system showed that the first twenty families were made of equal numbers of families from the two populations, an indication that a short term selection program in sole cropping system may produce genotypes suitable for both cropping systems. GE interaction effects for most of the characters evaluated were not significant suggesting that many more cycles were needed to create diversity between the two populations to reveal GE interaction effects. Estimates of heritability and the expected responses due to selection confirmed that much would be gained with further selection. Evaluation of bulks from different cycles of selection showed that higher yields were obtained from half-sib bulks than S1-bulks probably due to heterosis. Inbreeding depression was less in the bulks selected in intercropping systems. This suggests that homozygosity is likely to be achieved earlier in sole cropping than in intercropping, hence genotypes suitable for intercropping systems are likely to be more variable than those more suitable to sole cropping systems

Item Type: Article
Author Affiliation: Savanna Agricultural Research Institute, P.O.Box 52, Nyankpala, Tamale, Ghana
Subjects: Plant Production > Croping Systems
Crop Improvement > Genetics/Genomics
Divisions: Sorghum
Depositing User: Mr T L Gautham
Date Deposited: 14 Apr 2011 08:53
Last Modified: 14 Apr 2011 08:53
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