期刊
ARCHIVES OF MICROBIOLOGY
卷 203, 期 10, 页码 6215-6229出版社
SPRINGER
DOI: 10.1007/s00203-021-02588-w
关键词
Phomopsis liquidambaris; Aminocyclopropane-1-carboxylate deaminase; Ethylene biosynthesis; Rice; Salt stress
类别
资金
- National Natural Science Foundation of China [31570491]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- State Key Laboratory of Soil and Sustainable Agriculture, Nanjing Institute of Soil Science, Chinese Academy of Science [Y412201435]
The endophytic fungus Phomopsis liquidambaris can promote plant growth under salt stress by increasing the activity of 1-aminocyclopropane-1-carboxylate deaminase and reducing ethylene production. Inoculation of P. liquidambaris can decrease ACC accumulation in salt-treated rice seedlings, improving their growth.
The endophytic fungus Phomopsis liquidambaris is characterized as a plant growth-promoting agent under salt stress, but its mechanism is unknown. Herein, 1-aminocyclopropane-1-carboxylate deaminase (ACCD) from the strain was confirmed that it had the ability of utilizing 1-aminocyclopropane-1-carboxylate as the sole nitrogen source. The full-length ACCD gene was 1152 bp, which encodes a mature protein of 384 amino acids with a molecular mass of 41.53 kDa. The ACCD activity was 3.9-fold in 3 mmol L-1 ACC by qRT-PCR under salt stress comparing with no salt tress. Ethylene production was increased to 34.55-70.60% and reduced the growth of rice by 23-69.73% under salt stress. Inoculation of P. liquidambaris increased root-shoot length, fresh and dry weight, and overall growth of stressed rice seedlings. ACC accumulation, ACC synthase and ACC oxidase activities increased in salt-treated rice seedlings, while they were significantly reduced when P. liquidambaris was inoculated into rice by qRT-PCR. It therefore can be concluded that P. liquidambaris can be used as a plant growth promoting fungus against salt stress and other biotic or abiotic stresses.
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