PJB-2017-208
ENHANCED DUCKWEED ALKALI TOLERANCE BY OVERSPRESSION OF SERINE: GLYOXYLATE AMINOTRANSFRASE (ATAGT1)
DI WU, YUJIE HAN, FENGJIE WU, YERONG ZHU, XIAOLANZHANG, YING WEI, YONG WANG, CHEN ZHOU AND LIN YANG
Abstract
Alkaline salts are more harmful to plants than neutral salts. Improvement on the alkaline tolerance in plants is important to make full use of the large area of saline-alkaline water. It has been proved that photorespiration pathway provides protection to plants under stress. In this study, Arabidopsis serine: glyoxylate aminotransferase (AtAGT1)transgenic duckweeds were studied to investigate the alkaline stress tolerance. Enhanced protection from damage to cell membrane was detected in transgenic duckweeds under Na2CO3 treatment. Also, in the transgenic duckweed, reactive oxygen species (ROS) accumulation was decreased, and antioxidant enzyme activities were improved with alkaline condition. These results indicated that with the enhancement of photorespiration, antioxidant enzyme activities were improved, leading to the decline of ROS content under alkaline stress. These results also revealed the function of photorespiration enzyme during alkaline stress.
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