Switchgrass uses one gene switch to survive salt and drought
Guan C, Wang T, Wang C, Wu B, Zou Z
Crop Improvement
The roadside grasses that hold soil in place during droughts and downpours rely on exactly this kind of internal stress switch to keep growing when conditions turn harsh.
Switchgrass is a tough prairie grass used for animal feed and biofuel, and it can handle salty soil and dry spells better than many crops. Researchers found a small piece of genetic material called miR395e that normally keeps a certain gene, PvUXS1, in check, but under salt or drought stress that control loosens and PvUXS1 ramps up, helping the plant cope. This gene pair gives breeders a specific target to try to engineer even hardier versions of switchgrass and possibly other grasses.
Key Findings
Switchgrass exposed to 300mM NaCl and 10‰ soil salinity shared differentially expressed genes enriched in carbon metabolism and carbon fixation pathways.
A ceRNA network analysis across salt and drought conditions identified four shared pathways: photosynthesis, circadian rhythm, ribosome biogenesis, and aminoacyl-tRNA biosynthesis.
miR395e directly targets and negatively regulates PvUXS1 (Pavir.5NG221800); stress conditions lowered miR395e levels while raising PvUXS1 expression.
chevron_right Technical Summary
Scientists found a tiny genetic switch in switchgrass that helps the plant survive both salty soil and drought, pointing to a possible target for breeding tougher forage and bioenergy crops.
Abstract Preview
Original paper
Non-coding RNA levels integrating analysis revealed the salt and drought stress response mechanism of miR395e-PvUXS1 pathway in switchgrass.
Soil salinization and drought are major constraints on global agricultural production, yet the shared molecular mechanisms by which forage crops respond to these stresses remain incompletedly under...
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