In plants, cell-cell recognition is a crucial step in the selection of optimal pairs of gametes to achieve successful propagation of progeny. Flowering plants have evolved various genetic mechanisms, mediated by cell-cell recognition, to enable their pistils to reject self-pollen, thus preventing inbreeding and the consequent reduced fitness of progeny (self-incompatibility, SI), and to reject foreign pollen from other species, thus maintaining species identity (interspecific incompatibility)1. In the genus Brassica, the SI system is regulated by an S-haplotype-specific interaction between a stigma-expressed female receptor (S receptor kinase, SRK) and a tapetum cell-expressed male ligand (S locus protein 11, SP11), encoded by their respective polymorphic genes at the S locus2-6. However, the molecular mechanism for recognition of foreign pollen, leading to reproductive incompatibility, has not yet been identified. Here, we show that recognition between a novel pair of proteins, a pistil receptor SUI1 (STIGMATIC UNILATERAL INCOMPATIBILITY 1) and a pollen ligand PUI1 (POLLEN UNILATERAL INCOMPATIBILITY 1), triggers unilateral reproductive incompatibility between plants of two geographically distant self-incompatible Brassica rapa lines, even though crosses would be predicted to be compatible based on the S haplotypes of pollen and stigma. Interestingly, SUI1 and PUI1 are similar to the SI genes, SRK and SP11, respectively, and are maintained as cryptic incompatibility genes in these two populations. The duplication of the SRK and SP11 followed by reciprocal loss in different populations would provide a molecular mechanism of the emergence of a reproductive barrier in allopatry.

link: https://www.nature.com/articles/nplants201796

List of Articles
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» 2010 (2017) Duplicated pollen-pistil recognition loci control intraspecific unilateral incompatibility in Brassica rapa.
32 The genome of the mesopolyploid crop species Brassica rapa file
31 Identification of the BrRHP1 locus that confers resistance to downy mildew in Chinese cabbage (Brassica rapa ssp.pekinensis) and development of linked molecular markers file
30 Rapid Divergence of Repetitive DNA in Brassica Relatives file
29 Development and linkage mapping of unigene-derived microsatellite markers in Brassica rapa L. file
28 Anthocyanin Accumulation and Expression of Anthocyanin Biosynthetic Genes in Radish (Raphanus sativus). file
27 Identification of potential microRNAs and their targets in Brassica rapa L. file
26 Structural and functional comparative mapping between the Brassica A genomes in allotetraploid Brassica napus and diploid Brassica rapa file
25 A method for selection of restriction enzymes for sdCAPS marker construction file
24 MiRPI: Portable Software to Identify Conserved miRNAs, Targets and to Calculate Precursor Statistics file
23 Construction of a Full-Length cDNA Library from Korean Stewartia (Stewartia koreana Nakai) and Characterization of EST Dataset file
22 An efficient protocol for genetic transformation of watercress (Nasturtium officinale) using Agrobacterium rhizogenes file
21 An improved method for Agrobacterium-mediated genetic transformation from cotyledon explants of Brassica juncea file
20 2010 SeqCalc: A portable bioinformatics software for sequence analysis file
19 2010 Sequence and structure of Brassica rapa chromosome A3 file
18 2010 Overexpression of a yeast cadmium factor 1 (YCF1) enhances heavy metal tolerance and accumulation in Brassica juncea. file
17 2010 Development of a high density integrated reference genetic linkage map for the multinational Brassica rapa Genome Sequencing Project
16 2010 Composition Analysis between Kohlrabi (Brassica oleracea var. gongylodes) and Radish (Raphanus sativus).
15 2010 Effects of Soil pH on Nutritional and Functional Components of Chinese Cabbage (Brassica rapa ssp. campestris).
14 2009 Arabidopsis Pcr2 is a zinc exporter involved in both zinc extrusion and long-distance zinc transport.

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