Environmental stresses, especially heat and drought, severely limit plant growth and negatively affect wheat yield and quality worldwide. Heat shock factors (Hsfs) play a central role in regulating plant responses to various stresses. In this study, the wheat heat shock factor gene on chromosome 5D was isolated and functionally characterized, with the goal of investigating its role in responses to heat and drought stresses. Gene expression profiling showed that was expressed constitutively in various wheat tissues, most highly in roots at the reproductive stage. The expression of was highly up-regulated in wheat seedlings by heat, cold, drought, high salinity, and multiple phytohormones. The TaHsfA2e-5D protein was localized in the nucleus and showed a transcriptional activation activity. Ectopic expression of the in yeast exhibited improved thermotolerance. Overexpression of the in results in enhanced tolerance to heat and drought stresses. Furthermore, RT-qPCR analyses revealed that functions through increasing the expression of Hsp genes and other stress-related genes, including and . Collectively, these results suggest that functions as a positive regulator of plants' responses to heat and drought stresses, which may be of great significance for understanding and improving environmental stress tolerance in crops.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911409 | PMC |
| http://dx.doi.org/10.3390/ijms23052784 | DOI Listing |
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