Dominant dwarf mutants in rice induced with fractionated dose of gamma rays
1987
Kumar, C.R.A. | Sree Rangasamy, S.R. (Tamil Nadu Agricultural Univ., Coimbatore, Tamil Nadu (India). School of Genetics)
Presoaked seeds (24 h in distilled water) of TKM6 were exposed to gamma rays of 35 KR in split or fractionated treatments with 4-h intervals between each exposure. The treatments were 0, 35 KR in a single dose, 30 + 5 KR, 25 + 10 KR, 20 + 15 KR, 15 + 20 KR, 10 + 25 KR, 5 + 30 KR. In the first generation (M1), plants survived from only 3 treatments: 5 + 30 KR (3 plants), 30 + 5 KR (5 plants), and 20 + 15 KR (5 plants). All plants were dwarf, irrespective of treatment. When the plants were forwarded to the M2, the dwarf nature was maintained, with increase in tiller number and per-plant yield. The dwarf plants were crossed with TKM6 in direct and reciprocal combinations. The F1 exhibited the dwarf nature (82.8 cm to 91.3 cm), confirming the dominant nature of the mutation.
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