VARIATION IN QUANTITATIVE CHARACTERS OF OATS (AVENA SATIVA) AFTER DIFFERENT MUTAGEN TREATMENTS
Several mutagens, namely, therinal neutrons, P/sup 32/, and ethyl- inethanesulfonate, were compared for their relative efficiencies to induce genetic variability for the quantitatively inherited characters, heading date, plant height, and weight per 100 seeds, in Clintland 60 variety of hexaploid oats (Avena sativa). One lot of seeds was treated each of the following: 2.03 x 10/ sup 13/ neutrons per square centiineter; 0.12 Methyl-inethanesulfonate solution for 4 hours; a solution with 2 mu c of P/sup 32/ per seed for 72 hours; 0.12M ethylinethanesulfonate for 2 hours and a solution with 1 mu c of P/sup 32/ per seed for 72 hours, and no treatment. In addition 200 oat culms were injected with 0.10 M ethyl-Methanesulfonate at the boot stage. The occurrence of fatuoid and chlorophyll-deficient mutants in the M/sub 2/ generation of mutagen-derived populations only attested to the efficiency of the mutagens to induce mutations. In the M/sub 3/ generation, the genetic variability among families and ainong lines within families (except for plant height in the P/sup 32/ population) was significantly increased by all mutagens, as deterinined by the analyses of variance, ratio of mutagen-treated to check mean squares, and variance components. Thermal neutrons and ethyl-inethanesulfonate produced the greatest variability for all three quantitative characters. The estimates of genetic coefficients of variability and heritability percentages increased from the M/sub 2/ to the M/sub 3/ generation. This suggested that selection for seed weight, plant height, and heading date should not be practiced until at least the M/sub 3/ generation. The genetic correlations ainong characters heading date, plant height, and weight per 100 seeds generally were low for ethyl-methanesulfonate, intermediate for thermal neutrons, and high for P/sup 32/. Additional indirect evidence on types of mutations produced was obtained by comparing the seed weight frequency distributions for the neutron- and ethyl-methanesulfonate derived populations. The magnitude of variation of the individual oat lines, as determined by the kuntosis values and from frequency distributions, were small for ethyl- inethanesulfonate and large for the thermal neutron treatment. (TCO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-18-003579
- OSTI ID:
- 4139762
- Resource Relation:
- Other Information: Thesis. Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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