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Query: UMLS:C0277787 (stigma)
 13,352 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

ARK1 is a vegetatively expressed receptor protein kinase gene isolated from Arabidopsis thaliana based on its sequence similarity to Brassica genes involved in pollen-stigma signaling and the self-incompatibility response. This paper shows that the kinase domain of ARK1 autophosphorylates on serine and threonine residues when expressed as a recombinant fusion protein. ARK1 produces a 2.9 kb transcript encoding a transmembrane receptor protein kinase and a 1.4 kb transcript encoding the receptor domain alone. Constitutive high-level expression of ARK1 transcripts in transgenic Arabidopsis resulted in severe stunting and also disrupted normal cellular expansion and differentiation.
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PMID:An S-locus-related gene in Arabidopsis encodes a functional kinase and produces two classes of transcripts. 881 66

Self-incompatibility in Brassica refers to the rejection of self-related pollen and is mediated by a receptor protein kinase localized to the plasma membrane of the stigma epidermis in the flower. The recessive mutation mod eliminates self-incompatibility in the stigma. In mod mutants, self-compatibility was shown to be associated with the absence of transcripts encoded by an aquaporin-related gene. This observation suggests that a water channel is required for the self-incompatibility response of Brassica, which is consistent with the concept that regulation of water transfer from the stigma to pollen is a checkpoint in the early events of pollination in the crucifer family.
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PMID:An aquaporin-like gene required for the Brassica self-incompatibility response. 917 Oct 60

Self-incompatibility is one of the most common mechanisms used by plants to prevent self-fertilization. In the Brassicaceae, the inhibition of self-pollen is triggered right at the stigma surface by interaction of two highly polymorphic self-recognition proteins that are encoded by tightly linked genes of the S-locus haplotype: a receptor protein kinase displayed at the surface of stigma epidermal cells and its small diffusible ligand that is localized in the outer coat of pollen grains. It is the specific interaction between receptor and ligand encoded in the same S haplotype that determines specificity in the rejection of self-pollen. The chapter reviews recent results that have shed light on the genetic control, cell biology, and regulation of the self-recognition molecules, as well as the structural basis of ligand recognition. Models that aim to explain how diversification of the self-recognition repertoire can occur in this two-gene self-recognition system are discussed.
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PMID:Self-incompatibility in the Brassicaceae: Regulation and mechanism of self-recognition. 3061 26