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Published in Crop Sci 7:522-523 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Induction of Aneuploids in Hexaploid Oats, Avena sativa L., Through X-Irradiation1

C. Mannephong and K. Sadanaga2

Aneuploids were induced in the hexaploid oat variety ‘Cherokee’ through X-radiation (300r, 500r, 700r) of panicles in the pre-anthesis stage. The X1 and control plants were examined for abnormal tetrads (micronuclei in tetrads), and plants with more than 15% abnormal tetrads were classified abnormal and saved as potential sources of aneuploids and translocations. The percentage of abnormal plants was related to the X-ray treatments. Although the percentage (6.4) of monosomics was highest in the 700r treatment, we conclude that the 300r treatment (4.9%) was most efficient in producing monosomics since it was associated with the lowest percentage of translocations

Key Words: chromosomes • aberrations • monosomics • translocations • multivalents

1 Contribution from the Iowa Agricultural and Home Economics Experiment Station, Ames, and the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture. Journal Paper No. J-5612 of the Iowa Agricultural and Home Economics Experiment Station. Project 1176. Part of thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree. Research supported in party by Contract No. AT (11-1) 1276 from the Atomic Energy Commission, COO-1276-4.

2 Formerly Graduate Student (now Instructor, Department of Plant Breeding, Kasetsart University, Bangkok, Thailand), and Geneticist, Crops Research Division, ARS, USDA.

Received for publication March 30, 1967.




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