Document Type : Research Paper
Authors
1 Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran. E-mail: nooshinderakhshan2014@gmail.com
2 Corresponding Author, Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran. E-mail: hossein.alaei@vru.ac.ir
3 Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran. E-mail: r.saberi@vru.ac.ir
4 Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran. E-mail: sedaghati@vru.ac.ir
5 Department of Genetic and Plant Production, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran. E-mail: rahimiasg@gmail.com
Abstract
Salinity can prevent the uptake of soil mineral ions due to the negative effect of sodium ions and disturbance of ion balance, but the use of Trichoderma biocompounds improves growth under salinity stress. To investigate the effect of four salinity-resistant Trichoderma strains on growth traits and mineral element uptake of eggplant seedlings under stress conditions, an experiment has been performed in a completely randomized factorial design with three replications in the greenhouse of Vali-e-Asr University of Rafsanjan during 2016-2017. The first factor is salinity in four levels including the control and concentrations of 8, 12, and 16 dS/m and the second factor is Trichoderma as T. aureoviride (T148-2, T189-4) and T. virens (T145, T133-1) as well as the control. The results show that under the influence of salinity, a significant decrease in growth traits takes place. At the highest salinity level, the average dry weight of roots and shoots is 50% and 72%, respectively. For stem diameter and seedling height, a 20% decrease is observed compared to the control. However, inoculation with Trichoderma improves these traits, resulting in a 1.6-fold increase in root dry weight (T142-8), a 2.7-fold increase in shoot dry weight (T133-1), and a 1.3-fold increase in seedling height (T189-4) in comparison to the control. The highest diameter increase could be observed in T142-8 strain by 38%. Using Trichoderma leads to significant changes in sugar, sodium, potassium, and calcium content. The results of this study show that Trichoderma can be a suitable biological agent to increase tolerance at high levels of salinity stress and improve the growth traits of eggplant seedlings.
Keywords
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