POLLEN GERMINATION INHIBITORS IN EXTRACTS OF BRASSICA OLERACEA L. STIGMAS

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Summary

Pollen germination inhibitors were shown to be present in extracts of stigmas from two Brassica oleracea L. lines by thin-layer chromatographic bioassay. Some inhibitors were common to extracts of unpollinated, self-pollinated and cross-pollinated stigmas whilst others were only detected m stigma extracts following self-incompatible self-pollinations. With sampling times of 2, 4 and 24 h after pollination, inhibitors from self-pollinated stigmas were at their highest concentration approximately 2 h after pollination but were declining by 4 h, and were virtually absent by 24 h. A possible role for these pollen germination inhibitors in inhibiting pollen growth in vivo is noted.

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