caa a22 4500 477133274 CHVBK 20180405111710.0 cr unu---uuuuu 170330e19970401xx s 000 0 eng 10.1023/A:1002983905589 doi (NATIONALLICENCE)springer-10.1023/A:1002983905589 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 [Elektronische Daten] [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. Kluwer Academic Publishers, 1997 Oryza rufipogon nationallicence Griff nationallicence Oryza sativa nationallicence interspecific hybrid nationallicence hybrid swarms nationallicence cytological abnormalities nationallicence evolution and rice nationallicence Majumder N.D. Central Agricultural Research Institute, Port Blair-744 101, Andaman & Nicobar Group of Islands, India aut Ram T. Central Agricultural Research Institute, Port Blair-744 101, Andaman & Nicobar Group of Islands, India aut Sharma A.C. Central Agricultural Research Institute, Port Blair-744 101, Andaman & Nicobar Group of Islands, India aut Euphytica Kluwer Academic Publishers 94/3(1997-04-01), 295-302 0014-2336 94:3<295 1997 94 10681 https://doi.org/10.1023/A:1002983905589 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002983905589 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Majumder N.D. Central Agricultural Research Institute, Port Blair-744 101, Andaman & Nicobar Group of Islands, India aut NATIONALLICENCE 700 1- Ram T. Central Agricultural Research Institute, Port Blair-744 101, Andaman & Nicobar Group of Islands, India aut NATIONALLICENCE 700 1- Sharma A.C. Central Agricultural Research Institute, Port Blair-744 101, Andaman & Nicobar Group of Islands, India aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 94/3(1997-04-01), 295-302 0014-2336 94:3<295 1997 94 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer