By Shigesaburo Tsunoda and Norindo Takahashi (Eds.)
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Additional resources for Biology of Rice
Their results showed the presence of a regulatory gene and of allelic and non-allelic genes specify ing the isozyme bands. Esterase isozymes of leaf blades were also examined between some parental strains in numerous rice cultivars and hybrid plants. Nakagahra (1977) suggested that the esterase alleles are distributed in diverse varie tal groups and serve as useful gene markers not only for identification of cultivars but also for studies of varietal differentiation. V. CHARACTERISTICS OF THE ECOTYPES Many rice ecotypes have further differentiated from each of the eco species, japonica, javanica, and indica.
The different molecular forms of specific enzymes can be recognized from multiple bands showing enzyme activity following electrophoretic sepa ration. There are numerous reports which discuss isozymes in relation to genetics, phylogenetics, evolution, development and differentiation, regulatory mechanisms, and diseases but information concerning isozymal physiological significance is indistinct (Scandalios, 1974). In O. perennis and O. sativa , Chu (1967) first examined variation in peroxidase isozymes of the leaves, showing that the former species has greater variability than the latter.
Examining allozyme diversity among strains, it was found that p e r e n n is strains are highly polymorphic compared with sa tiva varieties. Among twenty-nine genotypes in fourloci combinations found in Asian p e r e n n is , eleven were found in the indica cultivars, while only four which all differ from the indica geno types were found in the ja p o n ic a cultivars (G. Second’s data, personal communication). Ninety-three percent of ja p o n ic a showed one of two o f these four genotypes, suggesting that the degree of contribution of wild rice to varietal differentiation was greater in the in dica type than in the ja p o n ic a .
Biology of Rice by Shigesaburo Tsunoda and Norindo Takahashi (Eds.)