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Arabidopsis  plants adapt to high ambient temperature by a suite of morphological changes including elongation of hypocotyls and petioles and leaf hyponastic growth. These morphological changes are collectively called thermomorphogenesis and are believed to increase leaf cooling capacity by enhancing transpiration efficiency, thereby increasing tolerance to heat stress. The bHLH transcription factor PHYTOCHROME INTERACTING FACTOR4 (PIF4) has been identified as a major regulator of thermomorphogenic growth. Here, we show that PIF4 promotes the expression of two homologous genes  LONGIFOLIA1  ( LNG1 ) and  LONGIFOLIA2  ( LNG2 ) that have been reported to regulate leaf morphology. ChIP-Seq analyses and ChIP assays showed that PIF4 directly binds to the promoters of both  LNG1  and  LNG2 . The expression of  LNG1  and  LNG2  is induced by high temperature in wild type plants. However, the high temperature activation of  LNG1  and  LNG2  is compromised in the  pif4  mutant, indicating that PIF4 directly regulates  LNG1  and  LNG2  expression in response to high ambient temperatures. We further show that the activities of LNGs support thermomorphogenic growth. The expression of auxin biosynthetic and responsive genes is decreased in the  lng  quadruple mutant, implying that LNGs promote thermomorphogenic growth by activating the auxin pathway. Together, our results demonstrate that  LNG1  and  LNG2  are directly regulated by PIF4 and are new components for the regulation of thermomorphogenesis.

PIF4 Promotes Expression of LNG1 and LNG2 to Induce Thermomorphogenic Growth in Arabidopsis