【摘要】 PCR和 Southern blotting检测表明 ,来自大肠杆菌的 mtl D基因已通过农杆菌介导整合进水稻基因组。mtl D基因在 T1代出现分离 ,T2 代出现纯系。在 0 .75% Na Cl胁迫下 ,7个转基因 T3 代株系都能检测到 mtl D酶活性 ,与对照相比细胞膜的相对电导率和大分子渗漏值明显降低。部分转基因株系能在 1 .0 % Na Cl浓度下正常生长 ,而对照在 0 .5% Na Cl浓度下已不能存活。通过有性杂交途径实现了 mtl D和 gut D两个基因的聚合 ,部分杂交后代株系能在 1 .2 5% Na Cl胁迫下正常生长结实。更多还原

【Abstract】 PCR and Southern blot analysis indicated that mtlD gene had been integrated into the rice genome mediated by Agrobacterium tumefaciens LBA4404 (pBIM). mtlD gene segragated in T 1 generation and pure transgenic lines appeared in T 2 generation. The expression of the mtlD gene in transgenic plants was demonstrated by enzymatic activity assay. Under 0 75% NaCl stress, the relative electronic conductivity and membrane permeability were detected in T 3 transgenic plants of 7 different lines. Results showed that the damage to membrane structure of the transgenic plant was lower than that of their controls. Some transgenic plant lines could grow normally under 1.0% NaCl stress whereas the controls could not grow and died after 2 weeks under the same environment. Through sexual hybridization, rice plants with mtlD gene and gutD gene were got, some of them could grow normally under the stress of 1.25% NaCl.更多还原