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The 9-cis-epoxycarotenoid dioxygenase(NCED)gene is rate-limiting in abscisic acid(ABA)biosynthesis.In this study,an NCED gene,designated FvNCED3(KY008746),was cloned from velvet ash(Fraxinus velutina Torr.)with a RACE method.The full length cDNA of FvNCED