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NHL  ( NDR1/HIN1 -like) genes play crucial roles in pathogen induced plant responses to biotic stress. Here, we report the possible function of  NHL6  in plant response to abscisic acid (ABA) and abiotic stress.  NHL6  was highly expressed in non-germinated seeds, and its expression was strongly induced by ABA and multiple abiotic stress signals. Loss-of-function of  NHL6  decreased sensitivity to ABA in the early developmental stages including seed germination and post-germination seedling growth of the  nhl6  mutants. However, overexpression of  NHL6  increased sensitivity to ABA, salt and osmotic stress of the transgenic plants. Further studies indicated that the increased sensitivity in the  35S :: NHL6  overexpressing plants could be a result of both ABA hypersensitivity and increased endogenous ABA accumulation under the stress conditions. It was also seen that the ABA-responsive element binding factors AREB1, AREB2 and ABF3 could regulate  NHL6  expression at transcriptional level. Our results indicate that  NHL6  plays an important role in the abiotic stresses-induced ABA signaling and biosynthesis, particularly during seed germination and early seedling development in  Arabidopsis .

Overexpression of the NDR1/HIN1-Like Gene NHL6 Modifies Seed Germination in Response to Abscisic Acid and Abiotic Stresses in Arabidopsis