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Molecular responses of Phytophthora capsici-challenged cucumber (Cucumis sativus L.) plants as influenced by resistance inducer application

Credit to Download: 1 | Page Numbers 10 | Abstract Views: 161
Year: 2017
COI code: JR_JPMB-5-2_001
Paper Language: English

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Authors Molecular responses of Phytophthora capsici-challenged cucumber (Cucumis sativus L.) plants as influenced by resistance inducer application

  Fatemeh Khosravi - Department of Biotechnology, Shahrood University of Technology, Shahrood, Iran
  Shahrokh Gharanjik - Department of Biotechnology, Shahrood University of Technology, Shahrood, Iran
  Ali Dehestani - Molecular Genetics Department, Genetics and Agricultural Biotechnology Institute of Tabrestan, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Abstract:

Phytophthora species are considered as the major cause of several plant diseases resulting in huge yield losses in agricultural crops. Despite years of effort to develop Phytophthora resistance varieties, there is no reports of a resistant cucumber variety. In this study, the effect of concomitant application of potassium phosphite (KPhi) and chitosan on some physiological and molecular responses of Phytophthora capsici-challenged cucumber plants were investigated. Cucumber plants were treated with KPhi and/or Chitosan at different concentrations and were then inoculated with zoospores of P. capsici and leaf samples were collected at different time courses. Results showed that Guaiacol peroxidase (GPOD) enzymatic activity surged immediately at first and second days after pathogen inoculation with a peak in plants treated with 4 gL-1 KPhi 2 days after inoculation. Compared to GPOD, the highest superoxide dismutase (SOD) activity was observed in the same treatment but later at 5 days after inoculation. It was indicated that the activity of antioxidant enzymes was greatly influenced by application of either KPhi or chitosan while their activity was not remarkably enhanced in control plants. qPCR analysis revealed that the highest increase in glutathione peroxidase (gpx) gene expression was achieved in plants concomitantly treated with 4 gL-1 KPhi and 200 mgL-1 chitosan 5 days after inoculation. The findings of this study provide novel information regarding inducing mechanisms of KPhi and chitosan which may be effective in mitigating disease severity.

Keywords:

Resistance inducer, Cucumber, potassium phosphite, Chitosan, Defense Response

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COI code: JR_JPMB-5-2_001

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Khosravi, Fatemeh; Shahrokh Gharanjik & Ali Dehestani, 2017, Molecular responses of Phytophthora capsici-challenged cucumber (Cucumis sativus L.) plants as influenced by resistance inducer application, Journal of plant molecular breeding 5 (2), https://www.civilica.com/Paper-JR_JPMB-JR_JPMB-5-2_001.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Khosravi, Fatemeh; Shahrokh Gharanjik & Ali Dehestani, 2017)
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Type: state university
Paper No.: 7087
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