Biologia plantarum 61:579-586, 2017 | DOI: 10.1007/s10535-016-0677-4
Root characteristics of grafted peppers and their resistance to Fusarium solani
- 1 State Key Laboratory of Crop Biology / Key Laboratory of Horticultural Crop Biology and Germplasm Innovation, Ministry of Agriculture / College of Horticultural Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, P.R. China
Root rot caused by Fusarium solani, is one of the most severe diseases in pepper (Capsicum annuum L.). Grafting has been attempted as an effective means to control the disease, but little is known about the disease resistance mechanism in grafted pepper. Therefore, we investigated the changes of biomass, cell structure, and the secondary metabolism in roots of control (non-grafted pepper) and grafted peppers using cvs. Weishi and Buyeding as rootstocks and the cv. Xinfeng 2 as a scion. After a manual inoculation, less F. solani invaded grafted pepper roots and consequently less serious injury to the root cell ultra-structure compared with the control was found. The roots of grafted pepper infected with F. solani exhibited greater biomass production and root activity than the roots of infected controls. Grafting led to an increased content of salicylic acid, benzoic acid, vanillin, lignin, and polyamines, as well as activities of phenylalanine ammonia lyase, polyphenoloxidase, and peroxidase. These results suggest that grafting improved the resistance of peppers to root rot.
Keywords: Capsicum annuum; cell ultra-structure; root rot; secondary metabolism
Subjects: root morphology; cell ultrastructure; secondary metabolites; disease index; root rot; grafted peppers
Received: December 6, 2015; Revised: June 19, 2016; Accepted: August 1, 2016; Published: September 1, 2017 Show citation
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