EFFECTS OF TEMPERATURE ON THE FREQUENCY OF SOMATIC MUTATIONS INDUCED BY X RAYS IN MAIZE SEEDLINGS (in Italian)
The frequency of yellow-green sectors on the green background of maize seedlings heterozygous Yg/sub 2//yg/sub 2/ (yg/sub 2/= yellow-green-2 on short arm of chromosome 9) was used as a criterion of measuring somatic mutation rate induced by x irradiation (3-8 kr) on seeds possessing 4 (dry seeds) or 11% (normal seeds) water content at different temperatures. With dry seeds the mutation rate was the same at -70 and 20 deg C, but dropped significantly and linearly passing from 20 to 30 deg , 50 and 65 deg C. Such decreases were great for the third leaf, moderate for leaf four, and slight for leaf five. In seedlings sprouted from seed irradiated with 11% moisture content, the sensitiviiy plateau of the dry seeds, between -70 and 20 deg C was missing, since the mutation rate of 20 deg C was already clearly decreased as compared with that of -70 deg C. (auth)
- Research Organization:
- Universita, Milan
- NSA Number:
- NSA-16-028765
- OSTI ID:
- 4791871
- Journal Information:
- Atti Associazone Genetica Italiana (Italy), Vol. Vol: 7; Other Information: RT/BIO(62)44. Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- Italian
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