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DELLA family duplication events lead to different selective constraints in angiosperms

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Abstract

Gibberellic acid (GA) is a major plant hormone involved in several biological processes from the flowering to the symbiosis with microorganisms. Thus, the GA regulation is crucial for plant biology. This regulation occurs via the DELLA proteins that belong to the GRAS transcription factor family. DELLA proteins are characterised by a DELLA N-terminal and a GRAS C-terminal domains. It is well known that DELLA activity appears after the bryophytes divergence and then evolved in the vascular plant lineages. Here we present the phylogeny of DELLA across 75 species belonging to various lineages from algae, liverworts and angiosperms. Our study confirmed two main duplication events, the first occurring before the angiosperms divergence and the other specific to the eudicots lineage. Comparative analysis of DELLA subclades in angiosperms revealed the loss in Poaceae and strong alteration in other species of the DELLA functional domain in the DELLA2 clade. In addition, molecular evolution analysis suggests that each of the clades (named DELLA1.1, DELLA1.2 and DELLA2) evolved differently but copies of each subclade are under strong purifying selection. This also suggests that, although the DELLA functional domain is altered in DELLA2, DELLA2 orthologs are still functional and operate in a different way compared to DELLA1 copies. In angiosperms, additional duplication events occurred and led to duplicate copies in species, genus or family such as in the Fabaceae subfamily Papilionoideae. This duplication led to the formation of additional paralogs in the DELLA1.2 subclade (DELLA1.2.1 and DELLA1.2.2). Interestingly, both copies appeared to be under relaxing selection revealing different evolutionary fate of the DELLA duplicated copies.

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Acknowledgements

We acknowledge the GenOuest bioinformatics core facility (https://www.genouest.org) for providing the computing infrastructure. Part of this work was conducted at the LRSV laboratory, which belongs to the TULIP Laboratoire d’Excellence (LABEX) (ANR-10-LABX-41). JK and CL were supported by the research project Engineering Nitrogen Symbiosis for Africa (ENSA), which is funded through a grant to the University of Cambridge by the Bill & Melinda Gates Foundation (OPP1172165). JK was supported by a doctoral research grant from the University of Rennes 1 – French Ministry of Higher Education and Research. This work benefited from the International Associated Laboratory “Ecological Genomics of Polyploidy” supported by CNRS (INEE, UMR CNRS 6553 Ecobio), University of Rennes 1, Iowa State University (Ames, USA).

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Correspondence to A. Aïnouche.

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Keller, J., Delcros, P., Libourel, C. et al. DELLA family duplication events lead to different selective constraints in angiosperms. Genetica 148, 243–251 (2020). https://doi.org/10.1007/s10709-020-00102-6

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  • DOI: https://doi.org/10.1007/s10709-020-00102-6

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