A comparative genomics examination of desiccation tolerance and sensitivity in two sister grass species

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dc.creatorChávez Montes, Ricardo A. (TTU)
dc.creatorHaber, Anna
dc.creatorPardo, Jeremy
dc.creatorPowell, Robyn F.
dc.creatorDivisetty, Upendra K.
dc.creatorSilva, Anderson T.
dc.creatorHernández-Hernández, Tania
dc.creatorSilveira, Vanildo
dc.creatorTang, Haibao
dc.creatorLyons, Eric
dc.creatorHerrera Estrella, Luis Rafael (TTU)
dc.creatorVanBuren, Robert
dc.creatorOliver, Melvin J.
dc.date.accessioned2023-05-11T17:22:15Z
dc.date.available2023-05-11T17:22:15Z
dc.date.issued2022
dc.description© 2022 National Academy of Sciences. All rights reserved. cc-by-nc-nd
dc.description.abstractDesiccation tolerance is an ancient and complex trait that spans all major lineages of life on earth. Although important in the evolution of land plants, the mechanisms that underlay this complex trait are poorly understood, especially for vegetative desiccation tolerance (VDT). The lack of suitable closely related plant models that offer a direct contrast between desiccation tolerance and sensitivity has hampered progress. We have assembled high-quality genomes for two closely related grasses, the desiccation-tolerant Sporobolus stapfianus and the desiccation-sensitive Sporobolus pyramidalis. Both species are complex polyploids; S. stapfianus is primarily tetraploid, and S. pyramidalis is primarily hexaploid. S. pyramidalis undergoes a major transcriptome remodeling event during initial exposure to dehydration, while S. stapfianus has a muted early response, with peak remodeling during the transition between 1.5 and 1.0 grams of water (gH2O) g21 dry weight (dw). Functionally, the dehydration transcriptome of S. stapfianus is unrelated to that for S. pyramidalis. A comparative analysis of the transcriptomes of the hydrated controls for each species indicated that S. stapfianus is transcriptionally primed for desiccation. Cross-species comparative analyses indicated that VDT likely evolved from reprogramming of desiccation tolerance mechanisms that evolved in seeds and that the tolerance mechanism of S. stapfianus represents a recent evolution for VDT within the Chloridoideae. Orthogroup analyses of the significantly differentially abundant transcripts reconfirmed our present understanding of the response to dehydration, including the lack of an induction of senescence in resurrection angiosperms. The data also suggest that failure to maintain protein structure during dehydration is likely critical in rendering a plant desiccation sensitive.
dc.identifier.citationChavez, Montes, R.A., Haber, A., Pardo, J., Powell, R.F., Divisetty, U.K., Silva, A.T., Hernandez-Hernandez, T., Silveira, V., Tang, H., Lyons, E., Herrera, Estrella, L.R., VanBuren, R., & Oliver, M.J.. 2022. A comparative genomics examination of desiccation tolerance and sensitivity in two sister grass species. Proceedings of the National Academy of Sciences of the United States of America, 119(5). https://doi.org/10.1073/pnas.2118886119
dc.identifier.urihttps://doi.org/10.1073/pnas.2118886119
dc.identifier.urihttps://hdl.handle.net/2346/93445
dc.language.isoeng
dc.subjectC4 grasses
dc.subjectComparative genomics
dc.subjectDesiccation tolerance
dc.subjectSister group contrast
dc.subjectTranscriptome remodeling
dc.titleA comparative genomics examination of desiccation tolerance and sensitivity in two sister grass species
dc.typeArticle

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