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Isozyme Divergence between Maintainers and Restorers in Hybrid Rice Breeding Programs in India
Author(s) -
Devanand P. S.,
Wan J.,
Rangaswamy M.,
Ikehashi H.
Publication year - 1999
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1999.0011183x003900030036x
Subject(s) - biology , heterosis , software maintainer , japonica , oryza sativa , allele , isozyme , genetic diversity , genetics , gene , microbiology and biotechnology , botany , hybrid , enzyme , population , biochemistry , demography , sociology
In hybrid rice breeding programs, genetic diversity between maintainers and restorers enhances heterosis. The objective was to measure the level of diversity between the two groups of rice ( Oryza sativa L.) breeding lines or cultivars which were screened as potential maintainers or restorers by test‐cross to WA (wild abortive)‐cytoplasm. Allele frequencies at 15 isozyme loci were compared between 51 potential maintainers and 56 potential restorers. Differences between the two types were found at eight isozyme loci on chromosomes 4, 6, 7,8,11, and 12. The majority of the potential maintainers exhibited japonica type alleles, whereas most of the potential restorers exhibited indica type alleles. This pattern is considered to be due to retained associations between Rf (restorer) lrf (maintainer) genes and genetic markers on chromosomes other than those carrying Rflrf genes. The diversity as well as differentiation of indica and japonica type alleles between maintainers and restorers should contribute to enhanced heterosis in hybrid rice.