Evolutionary implications of infra- and interspecific molecular variability of pathogenesis-related proteins

Brazilian Journal of Biology

L. B. Freitas²  S. L. Bonatto¹  F. M. Salzano² 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Biociências Departamento de GenéticaPorto Alegre RS ,Brazil

关键词: pathogenesis-related proteins;    PR;    molecular evolution;    plant defense;    proteínas relacionadas à patogênese;    PRs;    evolução molecular;    defesa em plantas;   

DOI  :  10.1590/S1519-69842003000300009

来源: SciELO

【 摘 要 】

We have examined phylogenetic relationships in seven pathogenesis-related (PR) protein families. Within-family comparisons involved 79 species, 166 amino acid sequences, and 1,791 sites. For 37 species, 124 different PR isoforms were identified (an average of 3.3 per species). Thirty-one of the 37 species investigated tended to cluster together (84%). Of the 17 clusters distinguished in the seven phylogenetic trees, 10 (59%) were in agreement with their taxonomic status, ascertained at the family level. The strong similarities among the intraspecific forms, as compared to interspecific differences, argue for some kind of gene conversion, but the rare occurrence of widely different isoforms also suggests diversifying selection. PRs 1, 6, and 4 seem to be less differentiated than PRs 3, 2, 10, and 5.

【 授权许可】

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