中文摘要：

为从分子水平上理解桑树在逆境胁迫中的应答机制，研究利用简并引物和RACE方法克隆了桑树氨基环丙烷羧酸（ACC）氧化酶基因部分序列，并初步分析了该基因在水分胁迫和盐胁迫下的表达模式。结果表明：克隆得到的桑树ACC氧化酶基因编码区与其它植物ACC氧化酶基因的同源性很高，与蔷薇科李属植物相似性高达85％～86％；该基因在水分胁迫下表达量增加，但个体之间表达量有差异，推测可能与个体抗旱性差异有关；在盐胁迫下，ACC氧化酶表达量变化不明显，同一桑树幼苗不同叶位之间有差异，推测是盐害引起组织死亡导致表达量发生变化，而非盐胁迫直接诱导，个体之间耐盐性的差异以及不同发育阶段的叶片对盐害的敏感程度不同，表达量变化也不同。

英文摘要：

To understand the response of mulberry in stress environment, we isolated a cDNA encoding 1-aminocyclopropane-1-carboxylate oxidase（ACC） from Morus alba and analyzed the expression of this gene in water stress and NaCl salinity. The results show that ACC oxidase expression level increased in water stress and the quantity was different among individuals. This indicated that mulberry ACC oxidase may be associated with drought tolerance, The expression level of ACC oxidase changed in NaCl salinity, which may be more associated with tissue death resulted from salinity than response to salinity stress itself.