Document Type : Research Paper

Authors

1 Ph.D Student U.O.Ramin. Khouzestan - - Department of Agronomy and Plant Breeding, Faculty of Agriculture, Agriculture and Natural Resources University of Khouzestan

2 Professor of Plant Production and Genetic Engineering, Faculty of Agriculture, Khuzestan Agricultural Sciences and Natural Resources University

3 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Agriculture and Natural Resources University of Khouzestan

4 Agricultural and Natural Resources Sciences University of Khuzestan

Abstract

In order to investigate the effect of Piriformospora indica and different levels of salicylic acid on morphological characteristics and activity of antioxidant enzymes of thyme (Thymus vulgaris L.) irrigation cut-off stress, an experiment has been conducted in the water year 2016, which has employed a split factorial experiment based on randomized complete block design with four replications in the research farm of dehloran Agricultural Research Center. The treatments consisted of four levels of salicylic acid (0, 150, 300 and 600 μm) as foliar application and a mycorrhiza fungus agent at two levels of inoculation and non-inoculation and irrigation cut-off stress at three levels (irrigation at 90, 50 and 30% filed capacity). The results of this study showed that with increasing irrigation cut-off stress up to 30% filed capacity plant height, Total weight of shoot, Number of leaves, Colonization percentage, and also the enzymes Catalase and Peroxidase Decreased. inoculation and treatment with salicylic acid up to a concentration of 300 μM could significantly reduce the destructive effects of irrigation cut-off stress on these traits However, increasing the concentration of salicylic acid to the level of 600 μM intensified the effects of irrigation cut-off stress and prevented the positive effects of the fungus.

Keywords