Journal of Integrative Agriculture ›› 2017, Vol. 16 ›› Issue (08): 1751-1757.DOI: 10.1016/S2095-3119(17)61695-2

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  • 收稿日期:2016-12-30 出版日期:2017-08-20 发布日期:2017-08-02

Increased resistance of drought by Trichoderma harzianum fungal treatment correlates with increased secondary metabolites and proline content

Mona S. Alwhibi1, Abeer Hashem1, 2, Elsayed Fathi Abd_Allah3, Abdulaziz A. Alqarawi3, Dina Wafi K. Soliman1, Stephan Wirth4, Dilfuza Egamberdieva4    

  1. 1 Department of Botany and Microbiology, Faculty of Sciences, King Saud University, Riyadh 11451, Saudi Arabia
    2 Mycology & Plant Disease Survey Department, Plant Pathology Research Institute, Giza 12511, Egypt
    3 Department of Plant Production, Faculty of Food & Agricultural Sciences, King Saud University, Riyadh 11451, Saudi Arabia
    4 Institute of Landscape Biogeochemistry, Leibniz Centre for Agricultural Landscape Research, Müncheberg 15374, Germany
  • Received:2016-12-30 Online:2017-08-20 Published:2017-08-02
  • Contact: Correspondence Elsayed Fathi Abd_Allah, E-mail: eabdallah@ksu.edu.sa
  • Supported by:

    The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University, Saudi Arabia (RGP-271).

Abstract:     Plant secondary metabolites play vital role in plant stress response. In this study we investigated whether root colonization of tomato (Solanum lycopersicum) infected by Trichoderma harzianum leads to alterations in the biosynthesis of secondary plant metabolites including phytohormones and osmolyte proline under drought stress. Exposure of tomato to drought caused a drastic decline in plant growth and physiological parameters. Tomato inoculated with T. harzianum showed increased root and shoot growth and chlorophyll pigments as compared to uninoculated controls as well as drought stressed plants. Proline and total soluble protein content was increased in plants inoculated with T. harzianum under both normal as well as drought conditions. An obvious increase in phenol and flavonoid content was observed due to T. harzianum. In addition, T. harzianum inoculated plants maintained higher levels of growth regulators indole acetic acid, indole butyric acid, and gibberellic acid under drought stress. Improved secondary metabolites which play an important role in plant stress tolerance by T. harzianum may have coordinately worked for bringing the growth regulation by protecting membranes from reactive oxygen species (ROS) and enhance plant growth through accessing more nutrients by root system.

Key words: antioxidants ,  proline ,  polyphenols ,  tomato ,  drought ,  Trichoderma harzianum