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Background  Drought is one of the most serious factors limiting plant growth and production. Sheepgrass can adapt well to various adverse conditions, including drought. However, during germination, sheepgrass young seedlings are sensitive to these adverse conditions. Therefore, the adaptability of seedlings is very important for plant survival, especially in plants that inhabit grasslands or the construction of artificial grassland.    Results  In this study, we found a sheepgrass MYB-related transcription factor,  LcMYB2  that is up-regulated by drought stress and returns to a basal level after rewatering. The expression of  LcMYB2  was mainly induced by osmotic stress and was localized to the nucleus. Furthermore, we demonstrate that  LcMYB2  promoted seed germination and root growth under drought and ABA treatments. Additionally, we confirmed that LcMYB2 can regulate  LcDREB2  expression in sheepgrass by binding to its promoter, and it activates the expression of the osmotic stress marker genes  AtDREB2A ,  AtLEA14  and  AtP5CS1  by directly binding to their promoters in transgenic Arabidopsis.    Conclusions  Based on these results, we propose that  LcMYB2  improves plant drought stress tolerance by increasing the accumulation of osmoprotectants and promoting root growth. Therefore,  LcMYB2  plays pivotal roles in plant responses to drought stress and is an important candidate for genetic manipulation to create drought-resistant crops, especially during seed germination.

A MYB-related transcription factor from sheepgrass, LcMYB2, promotes seed germination and root growth under drought stress