Pollen-stigma interaction which might be critical to the gametophytic incompatibility of Japanese pear.

@article{Yamashita1990PollenstigmaIW,
  title={Pollen-stigma interaction which might be critical to the gametophytic incompatibility of Japanese pear.},
  author={Ken-ichiro Yamashita and Hideo Saita and Nobuko Hashimoto},
  journal={Journal of The Japanese Society for Horticultural Science},
  year={1990},
  volume={59},
  pages={83-89}
}
A few fundamental experiments were carried out to increase information about the incompatibility of Japanese pear (Pyrus serotina R.). The results obtained are summarized as follows.1. Flowers of ′Kosui′ at anthesis were self- or cross-pollinated after emasculation, and pollen germination on stigmas at 6h after pollination was observed. Pollen grains in cross-pollination germinated well and their pollen tubes elongated into stigmas by that time. But in self-pollination, the number of pollen… 

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Results indicated not only that the surface-held proteins of the stigma are involved in pollen grain adhesion, but also that their turnover rate is rapid, suggesting a specificity of adhesion between higher plant cells in the presence of the cell wall.

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The present study was performed to get a clue to a solution for the obfuscating mechanism with reference to self-incompatibility in Pyrus serotina by studying the growth of pollen tubes and electrophoretic patterns of proteins from selfed and crossed pistils.

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It is concluded that S2-gene expression correlates well with the expression of incompatibility, and is reported here that expression of the gene occurs in the stigma and throughout the secretory tissue, but not in other parts, of mature pistils.

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TLDR
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TLDR
The pollen and stigma surfaces apparently complement one another to provide all the components of an ideal adhesive and specific binding of concanavalin A to the stigma surface decreases the adhesive capacity for pollen protein.