MOLECULAR CLONING AND GUS-AIDED ACTIVITY ASSAYING OF PROMOTER SEQUENCE OF AhNCED1 GENE FROM Arachis hypogaea L. cv. Yueyou 7 An Improved Promoter-cloning Method Based on Adaptor-PCR and Its Application in Rubber Tree Cloning and Expression Analysis of DaF3H Gene in Yam(Dioscorea alata) Cloning and Expression Analysis of DaF3H Gene in Yam(Dioscorea alata)