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Overexpression of IbMPK3 increases low-temperature tolerance in transgenic sweetpotato
Jin Rong,Kim Ho Soo,Yu Tao,Liu Ming,Yu Wenhui,Zhao Peng,Zhang Aijun,Zhang Qiangqiang,Liu Yaju,Cao Qinghe,Kwak Sang-Soo,Tang Zhonghou 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.1
Sweetpotato is an important crop that is very sensitive to low temperatures. Mitogen-activated protein kinase (MAPK) is involved in plant growth and development and is responsive to many environmental stresses. IbMPK3 is strongly regulated by low-temperature stress. We studied the function of IbMPK3 and how it may enhance the adaptability of sweetpotato plants to low-temperature stress. Transgenic sweetpotato plants overexpressing IbMPK3 were generated, and three trans- genic lines with the highest expression level of IbMPK3 were used for low-temperature tests. Transgenic plants exposed to low-temperature stress had less damage associated with higher photosynthesis efficiency and less cell membrane damage. IbMPK3-overexpressing transgenic plants could modulate reactive oxygen species (ROS) metabolism with lower levels of O2− and H2O2 accumulation and higher enzymatic activities than WT plants. Transcript expression levels of some ROS- related genes (IbCAT, IbCu-ZnSOD, and IbCAT) and stress-responsive genes (IbP3B and IbCOR27) were significantly upregulated in transgenic plants compared to WT. These results indicate that IbMPK3 has an important role in sweetpotato response to low temperatures.
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