Abstract
In field trials with potatoes cv. Bintje, Jaerla and Spunta in which the seed tubers had been treated with gamma -rays from a 60Co source with doses varying from 0.5 to 27 Gy, tuber yield, harvest index and number of stems and tubers were determined. A dose of 3 Gy increased the number of tubers by 30% in Spunta in 2 out of 3 trials and by 17% in one trial in Jaerla, but it did not increase the number of tubers in Bintje. Doses of 9 or 10 Gy did not influence the number of tubers nor stems, and decreased harvest index. A dose of 27 Gy yielded off-type plants with reduced yield and number of tubers. gamma -Radiation affected the growth of the sprout apex, allowing lateral buds or divisions of the affected apex to develop into stems. To achieve larger numbers of tuber-bearing stems, tubers should preferably be irradiated at the start of sprout growth, about 5 months before planting. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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