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ÄÄλ¸ßÊÖÄܰïÎÒ·Òë²¢½âÊÍÕâ¶Î»°In Arabidopsis thaliana, over-expression of a GH3 enzyme gene involved in auxin inactivation results in reduced levels of free auxin and increased stress tolerance (Park et al., 2007). During abiotic stress, expression of various GH3 genes is modulated by ABA. A connectionbetween auxin and ABA has also been implied for the rice transcription factor (TF) ABI5-like1 (ABL1), which controls stress-responsive genes through ABA-responsive elements in their promoters. The abl1 mutant shows reduced ABA responsiveness but hypersensitivity to auxin (Yang et al., 2011). Another example of cross-talk is provided by the TF OsAP2¨C39, which is a positive regulator of ABA biosynthe- sis but also induces expression of ELONGATED UPPERMOST INTERNODE (EUI), encoding a GA-deactivating enzyme |
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