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Auxin response factors (ARFs) compose a family of transcription factors and have been found to play major roles in the process of plant growth and development. However, their roles in plant carotenoid biosynthesis and responses to abiotic stresses are rarely known to date. In the present study, we found that the  IbARF5  gene from sweetpotato ( Ipomoea batatas  (L.) Lam.) line HVB-3 increased the contents of carotenoids and enhanced the tolerance to salt and drought in transgenic  Arabidopsis . The transgenic  Arabidopsis  plants exhibited the increased abscisic acid (ABA) and proline contents and superoxide dismutase (SOD) activity and the decreased H 2 O 2  content. Furthermore, it was found that  IbARF5  positively regulated the genes associated with carotenoid and ABA biosynthesis and abiotic stress responses. These results suggest that  IbARF5  is involved in carotenoid biosynthesis and salt and drought tolerance in transgenic  Arabidopsis . This study provides a novel  ARF  gene for improving carotenoid contents and salt and drought tolerance of sweetpotato and other plants.

A Sweetpotato Auxin Response Factor Gene (IbARF5) Is Involved in Carotenoid Biosynthesis and Salt and Drought Tolerance in Transgenic Arabidopsis