Document Type : Research Paper

Authors

• Najmeh Badakhshsan ¹
• Seyed Mozaffar Mansouri ²
• Hossein Mozafari ³
• Mohsen Mehrparvar ⁴

¹ Department of Biodiversity, Institute of Science and High Technology and Environmental Sciences, graduate University of Advanced Technology, Kerman, Iran

² Department of Biodiversity, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.

³ Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran

⁴ Graduate University of Advanced Technology

Abstract

Beneficial microbes, such as fungi and bacteria, can improve plant fitness in different ways by increasing nutrient uptake and production of secondary metabolites, oxidation enzymes, volatile organic compounds and growth hormones. These are used to strengthen the plant's defense system. In this study, the effect of Trichoderma harzianum strain T22 and a complex of bacterial species of the genus Thiobacillus on some biochemical and growth indices of tomato plants under biological stress of tomato fruit borer, Helicoverpa. Armigera, were studied under greenhouse conditions. The results show that treated plants with T. harzianum had clearly higher total phenolic compounds, soluble sugars, total chlorophyll, carotenoid and root mass in comparison with the control plants. Treated plants with Thiobacillus spp. also showed more production of hydrogen peroxide, total chlorophyll, carotenoid and root mass than controls. In addition, plants under the biotic stress of pest larvae have reacted strongly and produced oxidation enzymes such as polyphenol oxidase and ascorbate peroxidase which was significantly increased compared to plants without pest stress.

Keywords

• Biological products
• Helicoverpa. armigera
• oxidation enzymes

Main Subjects

• Physiology