Summary
After double or triple pollinations including selfing and the use of one-day-old compatible foreign pollen a severely self-incompatible clone could be forced to develop a reasonable amount of self-seeds per flower head. This number of self-seeds increased when the foreign pollination was delayed for e.g. 240 minutes in the double pollination experiment. Even more self seeds were obtained in the triple pollination experiment with a delayed second selfing.
The influence of the old foreign pollen may be caused by a mentor pollen or a pioneer pollen effect.
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Eenink, A.H. Compatibility and incompatibility in witloof chicory (Cichorium intybus L.). 4. Formation of self-seeds on a self-incompatible and a moderately self-compatible genotype after double and triple pollinations. Euphytica 33, 161–167 (1984). https://doi.org/10.1007/BF00022762
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DOI: https://doi.org/10.1007/BF00022762