Journal
FIELD CROPS RESEARCH
Volume 116, Issue 1-2, Pages 58-67Publisher
ELSEVIER
DOI: 10.1016/j.fcr.2009.11.010
Keywords
Brassica napus L.; Seeds per silique; Mixed major genes and polygenes inheritance model; Segregating generation analysis; Heritability
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Funding
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0442]
- National High Technology Research and Development Program of China (863 Program) [2006AA10Z1B8]
- National Key Technology Research and Development Program [2006BAD01A04]
- Hubei Provincial Government [2006AA206A03]
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Seeds per silique (SS) is one of three important components of yield in rapeseed. Genetic control of this trait was primarily studied in 2006 in the cross of 'HZ396' x 'Y106', in which 'Y106' is a higher-SS line and 'HZ396' is a lower-SS one. The frequency distribution of the F-2 generation deviated from a normal distribution and appeared to have a multi-modal pattern, indicating the influence of major genes mixed with polygenes. To test this hypothesis and uncover the genetic basis of SS in diverse genotypes, we further used the joint segregation analysis (JSA) of six populations (P-1, P-2, F-1, F-2, B-1 and B-2) in the crosses of 'HZ396' x 'Y106' and 'HZ165' x 'Y106' and four populations (P-1, P-2, F-1, F-2) in the cross of 'HZ168' x 'Y106' in 2008. The JSA revealed that SS was best described by the E-0 genetic model, a case of two additive-dominace-epistasis major genes as well as additive-dominace-epistasis polygenes. We observed considerable genetic diversity in all genotypes by evaluating the first- and second-order genetic parameters based on the JSA method. Variance analysis of genotype x year interaction revealed the steady genetic effects of the two major genes within different years. The additive effects of the two major genes ranged from -3.71 to -1.49 in the three crosses. Heritability of the major genes varied from 39% to 84% in diverse generations (B-1, B-2 and F-2), Which was much larger than that of the polygenes. These findings will facilitate breeding strategies for SS improvement as well as efforts to map the major genes. (C) 2009 Elsevier B.V. All rights reserved.
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