An S-RNase-based gametophytic self-incompatibility system evolved only once in eudicots

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Vieira, J (Autor) Outra; Nuno A Fonseca (Autor) Outra; Cristina Vieira (Autor) Outra

Revista

Título: Journal of Molecular Evolution

Vol. 67

Páginas: 179-190

ISSN: 0022-2844

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 44 Citações

Scopus - 43 Citações

Outras Informações

ID Authenticus: P-003-XF0

DOI: 10.1007/s00239-008-9137-x

Abstract (EN): It has been argued that the common ancestor of about 75% of all dicots possessed an S-RNase-based gametophytic self-incompatibility (GSI) system. S-RNase genes should thus be found in most plant families showing GSI. The S-RNase gene (or a duplicate) may also acquire a new function and thus genes belonging to the S-RNase lineage may also persist in plant families without GSI. Nevertheless, sequences that belong to the S-RNase lineage have been found in the Solanaceae, Scrophulariaceae, Rosaceae, Cucurbitaceae, and Fabaceae plant families only. Here we search for new sequences that may belong to the S-RNase lineage, using both a phylogenetic and a much faster and simpler amino acid pattern-based approach. We show that the two methods have an apparently similar false-negative rate of discovery (similar to 10%). The amino acid pattern-based approach produces about 15% false positives. Genes belonging to the S-RNase lineage are found in three new plant families, namely, the Rubiaceae, Euphorbiaceae, and Malvaceae. Acquisition of a new function by genes belonging to the S-RNase lineage is shown to be a frequent event. A putative S-RNase sequence is identified in Lotus, a plant genus for which molecular studies on GSI are lacking. The hypothesis of a single origin for S-RNase-based GSI (before the split of the Asteridae and Rosidae) is further supported by the finding of genes belonging to the S-RNase lineage in some of the oldest lineages of the Asteridae and Rosidae, and by Baysean constrained tree analyses.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12