d-OAT, ornithine--aminotransferase, is the key enzyme involved in proline biosynthesis. In this study the Arabidopsis d -OAT gene was transferred into rice (Oryza sativa L. ssp japonica cv. Zhongzuo 321), whose succes...d-OAT, ornithine--aminotransferase, is the key enzyme involved in proline biosynthesis. In this study the Arabidopsis d -OAT gene was transferred into rice (Oryza sativa L. ssp japonica cv. Zhongzuo 321), whose successful integration was demonstrated by PCR and Southern blot analysis. The over-expression of the gene in transgenic rice was also confirmed. Biochemical analysis showed that, under salt or drought stress conditions, proline contents in the leaves and roots in transgenic rice plants were 5- to 15-fold of those in non-transgenic controls. Under stress conditions, germinating rate of transgenic lines is higher than that of controls. Although the growth of rice plants tested were more and more retarded with the increasing of NaCl concentration, the transgenic plants grow faster compared to the controls under the same stress condition. Meanwhile, the resistance to KCl and MgSO4 stresses was also found enhanced in trans-genic rice. Furthermore, the over-expression of d -OAT also improved the yield of transgenic plants under stress condi-tions. The average yield per plant of transgenic lines in-creases about 12%—41% more than that of control lines under 0.1 mol/L NaCl stress. These data indicated that the over-expression of d -OAT, with the accumulation of proline, resulted in the enhancement of salt and drought tolerance and an increase of rice yield, which is of significance in agri-culture.展开更多
Electroporation, PEG, PEG plus electroporation and Biolistics methods were tested ingene transformation of P. yezoensis. The exogenous gus was from plasmid of pBI121 and pCAMBI-A1301, both contain the CaMV35S promoter...Electroporation, PEG, PEG plus electroporation and Biolistics methods were tested ingene transformation of P. yezoensis. The exogenous gus was from plasmid of pBI121 and pCAMBI-A1301, both contain the CaMV35S promoter. The receptors included the prooplasts, tissues and free-liv-ing conchocelis filaments of P. yezoensis. Several factors, for example, the voltage, capacitance and bi-valent cations, etc., were studied. Results show that these four methods are all efficient for gene transfor-mation in P. yezoensis; and that PEG is the best one, with transformation efficiency of up to 4 ×10-5.GUS activity was detected 26 days after transfation by using PEG method.展开更多
文摘d-OAT, ornithine--aminotransferase, is the key enzyme involved in proline biosynthesis. In this study the Arabidopsis d -OAT gene was transferred into rice (Oryza sativa L. ssp japonica cv. Zhongzuo 321), whose successful integration was demonstrated by PCR and Southern blot analysis. The over-expression of the gene in transgenic rice was also confirmed. Biochemical analysis showed that, under salt or drought stress conditions, proline contents in the leaves and roots in transgenic rice plants were 5- to 15-fold of those in non-transgenic controls. Under stress conditions, germinating rate of transgenic lines is higher than that of controls. Although the growth of rice plants tested were more and more retarded with the increasing of NaCl concentration, the transgenic plants grow faster compared to the controls under the same stress condition. Meanwhile, the resistance to KCl and MgSO4 stresses was also found enhanced in trans-genic rice. Furthermore, the over-expression of d -OAT also improved the yield of transgenic plants under stress condi-tions. The average yield per plant of transgenic lines in-creases about 12%—41% more than that of control lines under 0.1 mol/L NaCl stress. These data indicated that the over-expression of d -OAT, with the accumulation of proline, resulted in the enhancement of salt and drought tolerance and an increase of rice yield, which is of significance in agri-culture.
文摘Electroporation, PEG, PEG plus electroporation and Biolistics methods were tested ingene transformation of P. yezoensis. The exogenous gus was from plasmid of pBI121 and pCAMBI-A1301, both contain the CaMV35S promoter. The receptors included the prooplasts, tissues and free-liv-ing conchocelis filaments of P. yezoensis. Several factors, for example, the voltage, capacitance and bi-valent cations, etc., were studied. Results show that these four methods are all efficient for gene transfor-mation in P. yezoensis; and that PEG is the best one, with transformation efficiency of up to 4 ×10-5.GUS activity was detected 26 days after transfation by using PEG method.