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Effect of Unsaturation of Thylakoid Membrane Lipids on Drought Resistance in Transgenic Tomato

HUANG Xiao1,2,YANG Xiu-mei1,LIU Xun-yan1,MENG Qing-wei1(1.College of Life Science,Shandong Agricultural University,Taian 271018,China;2.Linyi Normal College,Linyi 276005,China)  
In order to investigate the relationship between fatty acid composition in thylakoid membrane and the tolerance to drought stress in tomato,WT and sense-transgenic line T(+)-12 were used to measure the fatty acid composition of thylakoid membrane,photosynthetic and chlorophyll fluorescence parameters,the activity of antioxidant enzymes and proline content under drought stress.The results showed that the content of linolenic acid(18∶3) obviously increased and that of linoleic acid(18∶2)concomita ntly decreased in the sense-transgenic line,resulting in the unsaturation increase of thylakoid membrane lipids.Compared to WT,the maximal photochemical efficiency of PSⅡ(Fv/Fm) and photosynthetic rate(Pn) in T(+)-12 line decreased less under drought stress,and could maintain higher activities of antioxidant enzymes and proline content.These results indicated that higher unsaturation of thylakoid membrane lipids enhanced the tolerance of tomato to drought stress.
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