数字农科院2.0

High temperature inhibits vascular development via the PIF4-miR166-HB15 module in Arabidopsis

文献类型： 外文期刊

作者： Hongbin Wei;Zhi Song;Yurong Xie;Hongli Cheng;Huiting Yan;Fan Sun;Huajie Liu;Junlong Shen;Laigeng Li;Xinhua He;Haiyang Wang;Keming Luo

作者机构：

关键词： HD-ZIPIII transcription factor;high temperature;miR166;PIF4;secondary cell wall;stem lodging;vascular development

期刊名称： Current biology : CB

ISSN： 1879-0445

年卷期： 2023 年 33 卷 15 期

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收录情况： SCIE（2023版）

摘要： The plant vascular system is an elaborate network of conducting and supporting tissues that extends throughout the plant body, and its structure and function must be orchestrated with different environmental conditions. Under high temperature, plants display thin and lodging stems that may lead to decreased yield and quality of crops. However, the molecular mechanism underlying high-temperature-mediated regulation of vascular development is not known. Here, we show that Arabidopsis plants overexpressing the basic-helix-loop-helix (bHLH) transcription factor PHYTOCHROME INTERACTING FACTOR 4 (PIF4), a central regulator of high-temperature signaling, display fewer vascular bundles (VBs) and decreased secondary cell wall (SCW) thickening, mimicking the lodging inflorescence stems of high-temperature-grown wild-type plants. Rising temperature and elevated PIF4 expression reduced the expression of MIR166 and, concomitantly, elevated the expression of the downstream class III homeodomain leucine-zipper (HD-ZIP III) family gene HB15. Consistently, knockdown of miR166 and overexpression of HB15 led to inhibition of vascular development and SCW formation, whereas the hb15 mutant displayed the opposite phenotype in response to high temperature. Moreover, in vitro and in vivo assays verified that PIF4 binds to the promoters of several MIR166 genes and represses their expression. Our study establishes a direct functional link between PIF4 and the miR166-HB15 module in modulating vascular development and SCW thickening and consequently stem-lodging susceptibility at elevated temperatures.

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