Summary
Experiments were made in which four different lines of Brussels sprout, each homozygous for S-allele 2, were tested for self-incompatibility at various stages of plant and flower development under different environmental conditions. The tests were made by counting the number of pollen tubes present in the style 24 hours after pollination, by means of the Ultra-violet Fluorescence technique.
The results showed that the degree of self-compatibility varied widely, being greatest during the middle to late stages of the flowering period, at the highest temperature treatment applied. No mean differences could be detected between the effects of self- or sib-pollination; or between pollination of flowers of different ages.
One of the inbred lines showed a greater response than all the others to the highest temperature at a late stage of flowering. Under these conditions this inbred line showed more than a tenfold increase in the number of tubes growing after self-pollination, as compared with the overall mean of the experiment. This result is interpreted as indicating a modifying effect of the genetic background on the expression of the major S-allele. On the basis of the results obtained, methods are suggested for more efficient selection of inbred lines of Brussels sprouts with strong and stable self-incompatibility behaviour.
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Johnson, A.G. Factors affecting the degree of self-incompatibility in inbred lines of Brussels sprouts. Euphytica 20, 561–573 (1971). https://doi.org/10.1007/BF00034212
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DOI: https://doi.org/10.1007/BF00034212