MORPHOLOGICAL AND CYTOLOGICAL CHANGES IN CENTURY PATNA 231 AND BLUEBONNET 50 RICE RESULTING FROM X-RAY AND THERMAL NEUTRON IRRADIATION
Morphological and cytological studies of one X/sub 2/ (maintained vegetatively) and 20 X/sub 5/ lines of Bluebonnet 50 and Century Patna 231 rice varieties obtained from seeds exposed to different dosages of x rays and thermal neutrons revealed a number of interesting and valuable mutant types. These included mutations of leaf size and color, growth habit, plant height and straw strength, particles, spikelets, flowering habit, and fertility. Some of the short-stature and other plants may have considerable economic value in breeding lodging resistant varieties. Cytological studies revealed that one plant was a tetraploid. Most plants studied were diploid but often had abnormal chromosome numbers or association. Univalents, trivalents, and quadrivalents were common but fragments. asynapsis, knot formations, irregular division, bridge formations, and differences in pollen grain size were observed. There was a positive correIation hetween quadrivalents in P.M.C. and pollen sterility and between pollen and spikelet sterility, although there were some unusual exceptions to this. (auth)
- Research Organization:
- Texas Agricultural Experiment Station, College Station; and Texas A. and M. Coll., Beaumont
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-016827
- OSTI ID:
- 4026512
- Journal Information:
- Crop Science (U.S.), Vol. Vol: 1; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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