期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/ijms232113094
关键词
endophytic fungi; Achnatherum inebrians; bacterial community; root exudates; Cd stress
资金
- Natural Science Foundation of China [32001399, U1812401]
- Karst Science Research Center of Guizhou Province [U1812401]
- Foundation of Science and Technology of Gansu Province [22JR5RA451]
- Changjiang Scholars and innovative Research Team in University [IRT_17R50]
- Fundamental Research Funds for the Central Universities in Lanzhou University [lzujbky-2021-ey01, lzujbky-2021-kb12]
- Open Project of State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University [2021-KF-02]
- Lanzhou University [561119206]
- Technical service agreement on research and development of beneficial microbial agents for Alpine Rhododendron [071200001]
This study investigated how the endophyte Epichloe gansuensis helps host plants build up a specific bacterial community when challenged by CdCl2. The results showed that the rhizosphere bacterial community played a greater role in enhancing CdCl2 resistance in the host plant mediated by E. gansuensis. The endophyte recruited distinct rhizosphere bacterial species and relevant functions by affecting root exudates.
Soil cadmium (Cd) pollution is a serious environmental problem imperiling food safety and human health. The endophyte Epichloe gansuensis can improve the tolerance of Achnatherum inebrians to Cd stress. However, it is still unknown whether and how the endophyte helps host plants build up a specific bacterial community when challenged by CdCl2. In this study, the responses of the structure and function of bacterial community and root exudates of E+ (E. gansuensis infected) and E- (E. gansuensis uninfected) plants to Cd stress were investigated. Analysis of bacterial community structure indicated that the rhizosphere bacterial community predominated over the root endosphere bacterial community in enhancing the resistance of CdCl2 in a host mediated by E. gansuensis. E+ plant strengthened the interspecific cooperation of rhizosphere bacterial species. Moreover, the analysis of root exudates demonstrated E. gansuensis and increased the contents of organic acids and amino acids under Cd stress, and most root exudates were significantly correlated with rhizosphere bacteria. These results suggested that E. gansuensis employed a specific strategy to recruit distinct rhizosphere bacterial species and relevant functions by affecting root exudates to improve the tolerance of the host to Cd stress. This study provides a firm foundation for the potential application of symbionts in improving phytostabilization efficiency.
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