NATURAL AND RADIATION-INDUCED RECOMBINATION IN TRITICUM-AGROPYRON OCTOPLOIDS
Cytogenetic studies were conducted on the first and second generations of irradiated and non-irradiated seeds from Triticum-Agropyron crosses. The percent survival of M/sub 1/ plants of all crosses was lower in the x-ray treatment than in the thermal neutron treatment. Among the hybrid combinations studied, (A. tricophorum x T. durum)/sup 2/ crossed-to both SH 191 and SH 198 produced plants of highest fertility. Meiotic analyses of irradiated and control M/sub 1/ populations revealed the highest frequency of multivalents in the neutron treatments. Among the spring-type segregates, at the octoploid level in M/sub 2/, the greatest number of wheat-like plants was found in the neutron treatment. Control plants with a maximum of only 2n = 52 chromosomes were found. Meiotic analyses of M/sub 2/ plants revealed that those in the neutron treatment carried the highest number of multivalents. Using the increase in number of multivalents in irradiated M/sub 1/ and M/sub 2/ meioses over those of the control as a criterion of induced translocation and survival of plants from irradiated seeds, the thermal neutron treatment was the more efficient in this experiment. (auth)
- Research Organization:
- Washington Agricultural Experiment Station, Pullman
- NSA Number:
- NSA-16-023454
- OSTI ID:
- 4820547
- Journal Information:
- J. Heredity, Vol. Vol: 52; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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