ISSN:
1573-5060
Keywords:
Oryza rufipogon
;
Griff
;
Oryza sativa
;
interspecific hybrid
;
hybrid swarms
;
cytological abnormalities
;
evolution and rice
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The morphology and cytology of selected hybrid swarms of wild and cultivated rices were studied following natural hybridization between the native species Oryza rufipogon Griff and exotic species Oryza sativa L. (var. Thaothabi and Moirangphoe). Similar studies were also conducted on populations developed through artificial hybridization of those two species. The morphological variation in plant height, anthocyanin pigmentation, Kernel and husk colour, sterility, presence of awns and grain shattering habits were similar in both natural (hybrid swarms) and artificially derived populations of interspecific hybrids. The cytological abnormalities such as quadrivalant formation at metaphase I, delayed separation, laggards and bridge formation, unequal separation and chromosomal elimination were also observed in both populations. These results indicated that the evolution of intermediate types had occurred due to genetic introgression from cultivated species to wild species. A systematic extinction of founder population was also noticed due to sudden ecological changes like deep submergence to medium submergence and human interference by growing cultivated species O. sativa L. in the area where wild species were being grown.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1002983905589
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