Gene expression differs in codominant prairie grasses under drought

Molecular Ecology Resources
Ava M Hoffman, Melinda D Smith

Abstract

Grasslands of the central United States are expected to experience severe droughts and other climate extremes in the future, yet we know little about how these grasses will respond in terms of gene expression. We compared gene expression in Andropogon gerardii and Sorghastrum nutans, two closely related codominant C4 grasses responsible for the majority of ecosystem function, using RNA-seq. We compared Trinity assemblies within each species to determine annotated functions of transcripts responding to drought. Subsequently, we compared homologous annotated gene-groups across the two species using cross-species meta-level analysis and functional clustering based on key terms. The majority of variation was found between species, as opposed to between drought and watered treatments. However, there is evidence for differential responses; Andropogon allocated gene expression differently compared to Sorghastrum, suggesting Andropogon focuses on stress alleviation (such as oxygen radical scavenging) rather than prevention. In contrast, Sorghastrum may employ a drought avoidance strategy by modulating osmotic response, especially with hormonal regulation. We found Sorghastrum tended to be more sensitive within 10 key gene-groups relate...Continue Reading

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Citations

Jul 31, 2018·Research in Sports Medicine·Ricardo J S CostaTrent Stellingwerff
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Feb 5, 2021·The New Phytologist·Jesse E GrayMelinda D Smith

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