期刊
PLANT SCIENCE
卷 240, 期 -, 页码 10-24出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2015.08.012
关键词
Raf-like MAP3K; GhMAP3K40; Expression pattern; Defence response; Growth and development; Interacting protein
资金
- National Natural Science Foundation of China [31171837, 31471424]
Mitogen-activated protein kinase (MAPK) cascades mediate various responses in plants. As the top component, MAP3K5 deserve more attention; however, little is known about the role of MAP3Ks, especially in cotton, a worldwide economic crop. In this study, a gene encoding a putative Raf-like MAP3K, GhMAP3K40, was isolated. GhMAP3K40 expression was induced by stress and multiple signal molecules. The plants overexpressing GhMAP3K40 had an enhanced tolerance to drought and salt stress at the germination stage. However, at the seedling stage, the transgenic plants suffered more severe damage after drought, exposure to pathogens and oxidative stress. The defence-related genes and the antioxidant system were activated in transgenic paints, suggesting that GhMAP3K40 positively regulate the defence response. The transgenic plants were less able to prevent pathogenic invasion, which was due to defects in the cell structure of the leaves. The root system of the control plants were stronger compared with the transgenic plants. These results indicated a negative role of GhMAP3K40 in growth and development and GhMAP3K40 possibly caused the defects by down-regulating the lignin biosynthesis. Overall, these results suggest that GhMAP3K40 may positively regulate defence response but cause reduced tolerance to biotic and abiotic stress by negatively regulating growth and development. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
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