The clues to species specificity of pollination among Brassicaceae |
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| Authors: | P Heizmann Doan-Trung Luu Christian Dumas |
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| Institution: | (1) Reproduction et Développement des Plantes, Unité Mixte de Recherche 5667, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, F-69364 Lyon Cedex 07, France e-mail: heizmann@cismsun.univ-lyon1.fr Tel.: +33-4-72 43 29 57, Fax: +33-4-72 43 14 26, FR;(2) Laboratoire de Phytochimie, Université Claude Bernard Lyon-1, bat 403, 43 bd du 11 novembre 1918, F-69622 Villeurbanne Cedex, France, FR |
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| Abstract: | The Brassica
S product of the pollen-signalling S-gene (SP11 for Specificity Pollen, or SCR for S locus Cysteine Rich) has recently been identified as a member of the family of PCPs (Pollen Coat Proteins), a group of small basic proteins.
In female plants SRK (S
Receptor Kinase) has been demonstrated, among several stigma-expressed S genes, to exclusively control self-pollen rejection. Genes and gene products that are highly related to the sporophytic SI
system appear to take part in the control of several stages of pollen-stigma interactions in the Brassicaceae. These genes
ensure, in particular, the species specificity of late pollen adhesion. Pollen capture itself is not species specific, since
it depends essentially on lipophilic affinities between pollen coatings and waxy pellicles on the stigma. These interactions
and their control are reviewed here.
Received: 2 August 2000 / Revision accepted: 11 August 2000 |
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| Keywords: | Pollen-pistil interactions Self-pollen rejection Pollen-stigma adhesion Pollen coat proteins Species specificity |
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