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- W3135214015 abstract "Yellowhorn (Xanthoceras sorbifolium) is an important edible woody oil tree species that is endemic to China. Drought and heat stresses are factors severely limiting the high-quality development of the yellowhorn industry. Transcription factors (TFs) play critical roles in regulating the response of woody plant species to water deficit or high temperature. However, the MYB TFs that respond to combined drought and heat stress in yellowhorn remain unclear. Here, we first investigated the physiological changes in 5 yellowhorn varieties in response to combined stress treatments. We observed significant changes in antioxidant enzyme activities and photosynthesis. The Maigaiti variety yielded the best results and was selected for subsequent experiments. An R2R3-type MYB TF, designated XsMYB44, was isolated from the leaves of yellowhorn. XsMYB44 expression was strongly induced by combined stress. Suppression of XsMYB44 expression via virus-induced gene silencing weakened yellowhorn tolerance to both individual and combined drought and heat stress, and the increased susceptibility was coupled with decreased plant height, fresh weight and relative water content and inhibited stomatal closure. Moreover, compared with the individual stresses, the combined stress caused increased reactive oxygen species levels and decreased antioxidant enzyme activities and proline content in XsMYB44-silenced plants. Furthermore, the expression levels of several defense-related genes were reduced in the XsMYB44-silenced plants. Overall, we studied the physiological characteristics of 5 yellowhorn varieties, and the results demonstrated that XsMYB44 acts as a positive regulator in the yellowhorn response to combined stress by triggering stomatal closure to maintain water levels and by modulating ROS homeostasis." @default.
- W3135214015 created "2021-03-15" @default.
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- W3135214015 date "2021-05-01" @default.
- W3135214015 modified "2023-10-01" @default.
- W3135214015 title "Role of Xanthoceras sorbifolium MYB44 in tolerance to combined drought and heat stress via modulation of stomatal closure and ROS homeostasis" @default.
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- W3135214015 doi "https://doi.org/10.1016/j.plaphy.2021.03.007" @default.
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