Patterns of evolution at the gametophytic self-incompatibility Sorbus aucuparia (Pyrinae) S pollen genes support the non-self recognition by multiple factors model

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Aguiar, B (Author) Other; Vieira, J (Author) FCUP; Cunha, AE (Author) Other; Nuno A Fonseca (Author) Other; Reboiro Jato, D (Author) Other; Reboiro Jato, M (Author) Other; Fdez Riverola, F (Author) Other; Raspe, O (Author) Other; Cristina Vieira (Author) FCUP

Journal

Title: Journal of Experimental Botany

Vol. 64

Pages: 2423-2434

ISSN: 0022-0957

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-005-0XH

DOI: 10.1093/jxb/ert098

Abstract (EN): S-RNase-based gametophytic self-incompatibility evolved once before the split of the Asteridae and Rosidae. In Prunus (tribe Amygdaloideae of Rosaceae), the self-incompatibility S-pollen is a single F-box gene that presents the expected evolutionary signatures. In Malus and Pyrus (subtribe Pyrinae of Rosaceae), however, clusters of F-box genes (called SFBBs) have been described that are expressed in pollen only and are linked to the S-RNase gene. Although polymorphic, SFBB genes present levels of diversity lower than those of the S-RNase gene. They have been suggested as putative S-pollen genes, in a system of non-self recognition by multiple factors. Subsets of allelic products of the different SFBB genes interact with non-self S-RNases, marking them for degradation, and allowing compatible pollinations. This study performed a detailed characterization of SFBB genes in Sorbus aucuparia (Pyrinae) to address three predictions of the non-self recognition by multiple factors model. As predicted, the number of SFBB genes was large to account for the many S-RNase specificities. Secondly, like the S-RNase gene, the SFBB genes were old. Thirdly, amino acids under positive selectionuthose that could be involved in specificity determinationuwere identified when intra-haplotype SFBB genes were analysed using codon models. Overall, the findings reported here support the non-self recognition by multiple factors model.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12