Overexpression of the ascorbate peroxidase gene from eggplant and sponge gourd enhances flood tolerance in transgenic Arabidopsis.
Previously, we found that the flood resistance of eggplant (Solanum melongena) and sponge gourd (Luffa cylindrica) enhanced ascorbate peroxidase (APX) activity under flooding, and consequently, both the SmAPX and LcAPX genes were cloned. In this study, the SmAPX and LcAPX genes were transferred under a ubiquitin promoter to Arabidopsis (At) via Agrobacterium tumefaciens. The expression and amount of APX and APX activities of the SmAPX and LcAPX transgenic lines were significantly higher than those of non-transgenic (NT) plants under a waterlogged condition. Furthermore, the SmAPX, LcAPX, At-sucrose synthases (SUS)-1, phosphoenolpyruvate carboxylase (PEPC), and lactate dehydrogenase (LDH) genes were overexpressed in all transgenic Arabidopsis lines after flooding treatment. Compared to NT plants, the malondialdehyde (MDA) contents and H2O2accumulation were significantly lower, but germination rates were significantly higher in all transgenic lines with higher APX activity, indicating that the overexpression of SmAPX and LcAPX in Arabidopsis could enhance flood tolerance by eliminating H2O2. Moreover, Arabidopsis seedlings overexpressing SmAPX and LcAPX also displayed greater resistance to flooding and less oxidative injury than NT plants subjected to flooding condition.
Department of Biotechnology, Ming Chuan University, Taoyuan, 333, Taiwan, Republic of China.
Chih-Ming
CM
Chiang
Department of Biotechnology, Ming Chuan University, Taoyuan, 333, Taiwan, Republic of China.
Chiu-Chen
CC
Chen
Graduate Institute of Plant Biology, National Taiwan University, Taipei, 106, Taiwan, Republic of China.
Shi-Peng
SP
Chen
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, 700000, Vietnam. linkuanhung@tdt.edu.vn.|Department of Horticulture and Biotechnology, Chinese Culture University, Taipei, 11114, Taiwan, Republic of China. linkuanhung@tdt.edu.vn.
Kuan-Hung
KH
Lin
Department of Horticulture and Biotechnology, Chinese Culture University, Taipei, 11114, Taiwan, Republic of China.
Li-Ru
LR
Chen
Department of Biotechnology, Ming Chuan University, Taoyuan, 333, Taiwan, Republic of China.
Yu-Huei
YH
Su
Department of Biotechnology, Ming Chuan University, Taoyuan, 333, Taiwan, Republic of China.
His-Cheng
HC
Yen
D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D060387:Ascorbate Peroxidases / Q000235:genetics* / Q000378:metabolism; D055868:Floods; D015870:Gene Expression; D018525:Germination; D029776:Luffa / Q000235:genetics* / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D036226:Seedlings / Q000254:growth & development; D012639:Seeds / Q000254:growth & development; D032323:Solanum melongena / Q000235:genetics* / Q000378:metabolism; D013312:Stress, Physiological
D010940:Plant Proteins; D060387:Ascorbate Peroxidases
Arabidopsis; Ascorbate peroxidase; Flood tolerance; Transgenic