, Volume 94, Issue 3, pp 295–302 | Cite as

Cytological and morphological variation in hybrid swarms and introgressed population of interspecific hybrids (Oryza rufipogon Griff. × Oryza sativa L.) and its impact on evolution of intermediate types

  • N.D. Majumder
  • T. Ram
  • A.C. Sharma


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.

Oryza rufipogon Griff Oryza sativa interspecific hybrid hybrid swarms cytological abnormalities evolution and rice 


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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • N.D. Majumder
    • 1
  • T. Ram
    • 1
  • A.C. Sharma
    • 1
  1. 1.Central Agricultural Research InstituteAndaman & Nicobar Group of IslandsIndia

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