Effect of Trichoderma Isolates on Physiological and Biochemical Characteristics of Tomato Seedlings under Cold Stress
کد مقاله : 1094-11THCBIOCONTROL (R2)
فریبا فیلبندی1، حسین علایی *2، محمدصادق خوش صحبت3، محمد اناری عباسی نژاد4
1دانشگاه ولیعصر (عج) دانشکده کشاورزی گروه گیاهپزشکی
2گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه ولی عصر عج رفسنجان، ایران
3دانشگاه ولیعصر (عج)دانشکده کشاورزی گروه گیاهپزشکی
4گروه شیمی، دانشکده علوم، دانشگاه ولی عصر عج رفسنجان، ایران
چکیده مقاله:
Low temperature stress (chilling) significantly hinder plant growth and productivity. Some Trichoderma isolates could induce tolerance to abiotic stress in plant by changes in the physiological and biochemical characteristics of the plant. In this study, the impact of native Trichoderma isolated from saline and alkaline soils, were investigated on enhancing growth and tolerance to cold stress in tomato seedlings. one month post inoculation with Trichoderma and root colonization, tomato seedlings were exposed to cold stress. Their biochemical responses and growth parameters were investigated in different time periods. Stem and root growth, chlorophyll content and amount of malondialdehyde as well as the activity of catalase (CAT) and peroxidase (POX) enzymes were measured on two to seven days post cold treatment. The results showed that cold reduces plant growth traits and chlorophyll (a, b) content. while Trichoderma isolates effectively reduced the adverse effects of cold stress in which was observed in increasing chlorophyll content and vegetative growth in tomato seedlings. Furthermore, a decrease in the amount of malondialdehyde was observed with the use of Trichoderma isolates in tomato seedlings under cold stress. The activities of POX and CAT enzymes increased during cold stress in both inoculated and non-inoculated plants with Trichoderma. Among the tested isolates, T482 was the most effective treatment in reducing the effect of cold stress in tomato seedlings. Conclusively, the findings show that Trichoderma plays a significant role in alleviating the harmful effects of cold stress in seedlings, and emphasize its potential as a beneficial agent in agriculture.
کلیدواژه ها:
Trichoderma, Cold stress, Malondialdehyde, Tomato, Chlorophyll
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