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Background Salt stress threaten the growth of plants, and even aggravate plant disease. In this article, salt-tolerant  Trichoderma  strain was isolated, and its potential to alleviate salt stress and diminish cucumber root rot caused by  Fusarium oxysporum  was evaluated. Results Twenty-seven  Trichoderma  isolates were isolated from samples of sea muds and algae collected from the South Sea of China. Among these, the isolate HN082102.1 showed the most excellent salt tolerance and antagonistic activity against  F. oxysporum  causing root rot in cucumber and was identified as  T. atroviride . Its antagonism ability may be due to mycoparasitism and inhibition effect of volatile substances. The application of  Trichoderma  mitigated the adverse effects of salt stress and promoted the growth of cucumber under 100 mM and 200 mM NaCl, especially for the root. When  T. atroviride  HN082102.1 was applied, root fresh weights increased by 92.55 and 84.86%, respectively, and root dry weights increased by 75.71 and 53.31%, respectively. Meanwhile, the application of HN082102.1 reduced the disease index of cucumber root rot by 63.64 and 71.01% under 100- and 0-mM saline conditions, respectively, indicating that this isolate could inhibit cucumber root rot under salt stress. Conclusions This is the first report of salt-tolerant  T. atroviride  isolated from marine habitat showing antagonistic activity to  F. oxysporum , and the results provide evidence for the novel strain  T. atroviride  HN082102.1 in alleviating salt stress and diminishing cucumber root rot, indicating that  T. atroviride  strain HN082102.1 can be used as biological control agent in saline alkali land.

bmc microbiology

A novel salt-tolerant strain Trichoderma atroviride HN082102.1 isolated from marine habitat alleviates salt stress and diminishes cucumber root rot caused by Fusarium oxysporum