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| 題名: | The p38-like MAP kinase modulated H2O2 accumulation in wounding signaling pathways of sweet potato |
| 作者: | Lin, HH (Lin, Hsin-Hung)
King, YC (King, Yu-Chi)
Li, YC (Li, Yu-Chi)
Lin, CC (Lin, Chih-Ching)
Chen, YC (Chen, Yu-Chi)
Lin, JS (Lin, Jeng-Shane)
Jeng, ST (Jeng, Shih-Tong) |
| 貢獻者: | 園藝系 |
| 關鍵詞: | ACTIVATED PROTEIN-KINASES
PROTOPLAST VOLUME REGULATION
HYDROGEN-PEROXIDE
IPOMOELIN GENE
GLYCOLATE OXIDASE
DEFENSE RESPONSE
CARBON-MONOXIDE
PLANT-LEAVES
NITRIC-OXIDE
P38 PATHWAY |
| 日期: | 2019-03 |
| 上傳時間: | 2019-06-25 13:22:46 (UTC+8) |
| 摘要: | In sweet potato (Ipomoea batatas cv Tainung 57), MAPK cascades are involved in the regulation of Ipomoelin (IPO) expression upon wounding. p38 MAPK plays an important role in plant's responses to various environmental stresses. However, the role of p38-like MAPK in wounding response is still unknown. In this study, the levels of phosphorylated-p38-like MAPK (pp38-like MAPK) in sweet potato were noticeably reduced after wounding. In addition, SB203580 (SB), a specific inhibitor blocking p38 MAPK phosphorylation, considerably decreased the accumulation of pp38-like MAPK. Expression of a wound-inducible gene IPO was elevated by SB. Moreover, it stimulated hydrogen peroxide (H2O2) production rather than cytosolic Ca2+ elevation in sweet potato leaves. However, NADPH oxidase (NOX) inhibitor diphenyleneiodonium could not inhibit IPO induction stimulated by SB. These results indicated a p38-like MAPK mechanism was involved in the regulation of IPO expression through NOX-independent H2O2 generation. In addition, the presence of the protein phosphatase inhibitor okadaic acid or the MEK1/ERK inhibitor PD98059 repressed the H2O2- or SB-induced IPO expression, demonstrating phosphatase(s) and MEK1/ERK functioning in the downstream of H2O2 and pp38-like MAPK in the signal transduction pathway stimulating IPO. Conclusively, wounding decreased the amount of pp38-like MAPK, stimulated H2O2 production, and then induced IPO expression. |
| 關聯: | Plant Science
Volume 280, March 2019, Pages 305-313 |
| 顯示於類別: | [園藝暨生物技術學系] 期刊論文
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