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The NAC family is one of the largest transcription factor families unique to plants, which regulates the growth and development, biotic and abiotic stress responses, and maturation and senescence in plants. In this study,  PheNAC3 , a  NAC  gene, was isolated and characterized from moso bamboo ( Phyllostachys edulis ). PheNAC3 belong to the NAC1 subgroup and has a conserved NAC domain on the N-terminus, which with 88.74% similarity to ONAC011 protein. PheNAC3 localized in the nucleus and exhibited transactivation activity.  PheNAC3  was upregulated during the process of senescence of leaves and detected shoots.  PheNAC3  was also induced by ABA, MeJA, NaCl and darkness, but it had no remarkable response to PEG and SA treatments. Overexpression of  PheNAC3  could cause precocious senescence in  Arabidopsis . Transgenic  Arabidopsis  displayed faster seed germination, better seedling growth, and a higher survival rate than the wild-type under salt or drought stress conditions. Moreover,  AtSAG12  associated with senescence and  AtRD29A  and  AtRD29b  related to ABA were upregulated by  PheNAC3  overexpression, but  AtCAB  was inhibited. These findings show that  PheNAC3  may participate in leaf senescence and play critical roles in the salt and drought stress response.

Overexpression of PheNAC3 from moso bamboo promotes leaf senescence and enhances abiotic stress tolerance in Arabidopsis