PLOS ONE · 14 authors, 12 centres
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Ancestral state reconstructions across five orchid subfamilies showed that erect dehiscent fruits with non-lignified dehiscence zones and a short ripening period are ancestral in orchids, and gene expression analysis of E. pusilla fruits revealed that fruit dehiscence genes differ in expression pattern from their Arabidopsis thaliana homologs.
The authors performed ancestral state reconstructions across five orchid subfamilies to study the evolution of fruit dehiscence zone traits and explored developmental gene expression in Erycina pusilla fruits using RNA-seq and qPCR. Results indicated that erect dehiscent fruits with non-lignified dehiscence zones and a short ripening period are ancestral characters in orchids, with lignified dehiscence zones having evolved multiple times from non-lignified zones. Gene expression analysis at different developmental stages showed that MADS-box genes and other important regulators in E. pusilla differed in expression pattern from their A. thaliana homologs, suggesting that the current A. thaliana fruit dehiscence model requires adjustment for orchids.
