| Summary: | <i>Trihoderma citrinoviride</i> protects plants from diseases by functioning as antagonists of many pathogenic fungi or by triggering the antioxidant defense system in plants. In the present study, to uncover the possible alleviative role of <i>Trichoderma</i> against salinity and <i>Rhizoctonia solani</i> infection, strawberry plants were pretreated <i>Trichoderma citrinoviride</i> and then subjected to salinity, <i>R. solani</i> and combined salinity and <i>R. solani</i>. The effect of <i>T. citrinoviride</i> on the alleviation of the effects of salt stress and <i>Rhizoctonia solani</i> infection was investigated by analysing leaf dry weight, PSII efficiency, and the activity of some antioxidant enzymes in the leaves of strawberry plants. <i>T. citrinoviride</i> improved competitive capability against salinity and <i>R. solani</i> infection. It showed 79% inhibition of the growth of pathogen <i>R. solani</i>. <i>T. citrinoviride</i> reduced 63% of the severity of disease in the leaves. <i>Trichoderma</i> pretreatment maximized plant dry weight. The <i>T. citrinoviride</i>-pretreated plants showed higher levels of PSII efficiency (Fv/Fm). Decreased lipid peroxidation and H<sub>2</sub>O<sub>2</sub> accumulation compared to untreated seedlings under salt stress and <i>R. solani</i> infection was observed. <i>Trichoderma</i>-pretreated and –untreated plants respond differently to salt stress and <i>R. solani</i> infection by means of antioxidant defense. As compared to untreated seedlings, treated seedlings showed significantly lower activities of antioxidant enzymes, superoxide dismutase (SOD), peroxidase (POX), cell wall peroxidase (CWPOX) under salt stress and <i>R. solani</i> infection, indicating that treated seedlings might sense lower stress as compared to untreated seedlings. The study reports the effective adaptive strategy and potential of <i>T. citrinoviride</i> in alleviating the negative impact of salt stress and <i>R. solani</i> infection in strawberry.
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