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• W296815689 abstract "Over half of the families of flowering plants are thought to express one form or another of self-incompatibility - the ability to recognize and reject self-pollen, while accepting non-self pollen. To date, three separate self-incompatibility systems have been well characterized in terms of the specific functional genes and protein interactions occurring in the different responses. Gametophytic self-incompatibility systems (where the haploid genotype of the pollen grain governs recognition) based on a style-expressed ribonuclease (S-RNase) have been well studied in the Solanaceae, Rosaceae and Scrophulariaceae. A different gametophytic self-incompatibility system, with a complex pollen rejection cascade involving changes in intracellular Ca 2+ concentrations, has been characterized in Papaver rhoeas. Sporophytic self-incompatibility (where recognition is based on the diploid genotype of the pollen parent) in the Brassicaceae utilizes a receptor-kinase mediated signal-transduction cascade to reject self-pollen. Recent experiments have provided a great deal of new and significant information regarding the molecular basis for pollen recognition and rejection in all three of these systems. After many years of searching, the pollen-recognition component (pollen-S) of the S-RNase based gametophytic system was finally identified. Pollen-S encodes an pollen-expressed F-box protein termed SLF. F-box proteins are the key recognition component of SCF E3 ubiquitin ligase complexes. Together with the previous isolation of RING domain proteins (putative E3 ligases) from Petunia hybrida and Solanum chacoense, the identification of pollen-S as an F-box protein has led to a working model where non-self S-RNases, imported into compatible pollen tubes, are targeted by a proposed SCF SLF complex, and subsequently ubiquitinated and (possibly) degraded. In Papaver, recent research results have demonstrated a multi-faceted pollen-rejection response involving Ca 2+ signalling, actin depolymerization, and programmed cell death. In the sporophytic system of Brassica, downstream signalling events require the expression of a stigmatic protein ARC1, that contains a U-box motif and also functions as an E3 ubiquitin ligase. Inhibition of the ubquitin-proteasome system in Brassica leads to self-compatibility. Therefore in at least two self-incompatibility systems, recognition and rejection of self-pollen appears to be regulated by the ubiqultin-proteasome system for protein turnover." @default.
• W296815689 created "2016-06-24" @default.
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• W296815689 date "2005-01-01" @default.
• W296815689 modified "2023-10-07" @default.
• W296815689 title "Pollen recognition and rejection in different self-incompatibility systems" @default.
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