| 1 | Over-expression of an Arabi-dopsisd δ-OAT gene enhances salt and drought tolerance in transgenic rice显示文摘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. | WU Liangqi, FAN Zhanmin, GUO Lei, LI Yongqing, ZHANG Wenjing, QU Li-Jia & CHEN Zhangliang The National Laboratory of Protein Engineering and Plant Genetic En-gineering, College of Life Sciences, Peking University, Beijing 100871, China Correspondence should be addressed to Qu Li-Jia (e-mail: qulj@pku. edu.cn) | 2003 | Chinese Science Bulletin2003，48，23： | 11 |
| 2 | Obtaining transgenic rice resistant to rice fungal blast disease by controlled cell death strategy显示文摘The strategy of the two-component system, composed of Barnase and Barstar which encode RNase and a specific inhibitor to the RNase respectively, is adopted to obtain transgenic rice resistant to rice fungal blast disease. In this study, two chimeric promoters, induced by rice blast fungus pathogen (Magnaporthe grisea), are fused with Barnase respectively to construct two plant expression vec-tors, pWBNBS and pPBNBS together with the Barstar driven by CaMV 35S promoter. The resistance of the transgenic rice lines to rice blast fungus disease and rice blight disease are evaluated. The results show that (1) the expression of Barnase is induced in rice leaves when inoculated with the spores of Magnaporthe grisea; (2) the induced expression level of Barnase surpasses the level of Barstar, which elicits a similar hypersensitive response (HR) in the leaves, and the transgenic plant shows high resistance to the rice fungal blast disease; and (3) transgenic rice plants also show obvious re-sistance to rice bacterial blight disease. Taken together, these results suggest that the transgenic rice plants harboring this two-component system acquire relatively broad spectrum resistance against pathogens, especially high resistance to rice fungal pathogen. | MAO Shengji, GU Hongya, QU Lijia & CHEN Zhangliang National Key Laboratory of Protein Engineering and Plant Genetic En-gineering, College of Life Sciences, Peking University, Beijing 100871, China Correspondence should be addressed to Qu Lijia (e-mail: qulj@plum. lsc.pku.edu.cn) | 2003 | Chinese Science Bulletin2003，48，16： | 2 |
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