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MAX2 (MORE AXILLARY GROWTH2) is involved in diverse physiological processes, including photomorphogenesis, the abiotic stress response, as well as karrikin and strigolactone signaling-mediated shoot branching. In this study, MdMAX2, an F-box protein that is a homolog of  Arabidopsis  MAX2, was identified and characterized. Overexpression of  MdMAX2  in apple calli enhanced the accumulation of anthocyanin. Ectopic expression of  MdMAX2  in  Arabidopsis  exhibited photomorphogenesis phenotypes, including increased anthocyanin content and decreased hypocotyl length. Further study indicated that MdMAX2 might promote plant photomorphogenesis by affecting the auxin signaling as well as other plant hormones. Transcripts of  MdMAX2  were noticeably up-regulated in response to NaCl and Mannitol treatments. Moreover, compared with the wild-type, the  MdMAX2 -overexpressing apple calli and  Arabidopsis  exhibited increased tolerance to salt and drought stresses. Taken together, these results suggest that MdMAX2 plays a positive regulatory role in plant photomorphogenesis and stress response.

Apple F-Box Protein MdMAX2 Regulates Plant Photomorphogenesis and Stress Response