Metabolic engineering using mtlD gene enhances tolerance to water deficit and salinity in sorghum
Maheswari, M.,Central Research Inst. for Dryland Agriculture, Hyderabad (India). Div. of Crop Sciences | Varalaxmi, Y.,Central Research Inst. for Dryland Agriculture, Hyderabad (India). Div. of Crop Sciences | Vijayalakshmi, A.,Central Research Inst. for Dryland Agriculture, Hyderabad (India). Div. of Crop Sciences | Yadav, S.K.,Central Research Inst. for Dryland Agriculture, Hyderabad (India). Div. of Crop Sciences | Sharmila, P.,University of Delhi (India). Dept. of Environmental Biology | Venkateswarlu, B.,Central Research Inst. for Dryland Agriculture, Hyderabad (India). Div. of Crop Sciences | Vanaja, M.,Central Research Inst. for Dryland Agriculture, Hyderabad (India). Div. of Crop Sciences | Pardha Saradhi, P.,University of Delhi (India). Dept. of Environmental Biology
Sorghum bicolor cv. SPV462 was transformed with the mtlD gene encoding for mannitol-1-phosphate dehydrogenase from E. coli with an aim to enhance tolerance to water deficit and NaCl stress. Transgene (pCAM mtlD) integration and expression were successfully confirmed by PCR, Southern, RT-PCR and Western analysis. Segregation analysis based on germination of T0 seed on hygromycin-supplemented medium revealed an expected Mendelian ratio 3:1 in lines 5, 72 and 75. Retention of leaf water content was remarkably higher in transgenic leaf segments when exposed to polyethylene glycol 8000 (-2.0 MPa), as compared to the untransformed controls. Another significant finding is that the transgenics maintained a 1.7 to 2.8 fold higher shoot and root growth, respectively, under NaCl stress (200 mM) when compared to untransformed controls. These results demonstrate that engineering mannitol biosynthetic pathway into sorghum can impart enhanced tolerance to water deficit and salinity.
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