GENETIC VARIABILITY IN OATS FOLLOWING HYBRIDIZATION AND IRRADIATION
The effects of an acute dose of thermal neutron irradiation on the genetic variability of 3 quantitatively inherited characters, heading date, height, and 100-seed weights, in pure line and hybrid populations of oats were evaluated. Plants from irradiated lots of 1000 seeds of both Clintland and Beedee and 2000 F/sub 2/ seeds of Clintland H Beedee and nonirradiated lots of 200 Clintland, 200 Beedee, and 2000 F/sub 2/ seeds were grown to maturity in the greenhouse. This was a precautionary measure to minimize the natural crossing that occurs in irradiated field populations. A space-plant row from each greenhouse plant was grown in the field in 1958, and data were recorded for heading date, height, and chlorophyll and futuoid mutants. Individual plants from each row were harvested and threshed, and 100-seed weights were determined on a portion of the plants. For one experiment in 1959. two plants were chosen at random to represent each family (row), and for the second experincent the plants having the highest and lowest seed weights within a family were selected. The experiments, each containing 1008 entries representing 504 families. were replicated 4 times in hill plots. Variance annlyses of the 1959 data indicated that radiation increased the variance both between and within families in Clintland, Beedee, and hybrid backgrounds. No consistent positive or negative shifts in skewness values were induced by radiation which suggests that equal numbers of beneficial and detrimental mutations were caused. The increased variance due to radiation showed that lines were shifted from the central portion of the distributions. and consiatent positive kuntosis values for all three characters indicated that the extremes of the curves were increased relatively more than the flanks. Both the results from the selection experiment and the heritability percentages indicated that the variability created by radiation was equally as heritable as that due to hybridization. (auth)
- Research Organization:
- Iowa Agricultural and Home Economics Experiment Station, Ames
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-016828
- OSTI ID:
- 4038896
- 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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