The role of salicylic acid in defense response of tomato to root-knot nematodes |
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| Institution: | 1. Institute of Plant Protection, National Research Council, CNR, 70126 Bari, Italy;2. Department of Agro-forestal and Environmental Biology and Chemistry, University of Bari, 70126 Bari, Italy;1. Unité de Recherche en Génomique Végétale (URGV), UMR INRA/CNRS/Université d’Evry Val d’Essonne/Saclay Plant Sciences, 2 rue Gaston Crémieux, 91057 Evry, France;2. Center for Desert Agriculture, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia;1. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China;2. Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin 300387, PR China;1. Section of Plant Pathology and Nematology, Department of Botany, Aligarh Muslim University, Aligarh, 202002, Uttar Pradesh, India;2. Department of Botany, School of Sciences, Maulana Azad National Urdu University, Hyderabad, India;3. Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia;4. Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, 202002, Uttar Pradesh, India;5. Bristol Centre for Functional Nonmaterials, HH Wills Physics Laboratory, Tyndall Avenue, University of Bristol, Bristol, BS8 1FD, UK;1. Plant Protection and Biomolecular Diagnosis Department, Arid Lands Cultivation Research Institute, City of Scientific Research and Technological Applications, New Borg El-Arab City, 21934 Alexandria, Egypt;2. Plant Pathology Department, Faculty of Agriculture (Elshatby), Alexandria University, 21545 Alexandria, Egypt;3. Botany and Microbiology Department, College of Science, King Saud University, P.O. Box. 2455, Riyadh 11451, Saudi Arabia;4. Department of Agronomy, Kansas State University, Manhattan, KS 66506, United States;5. Agricultural Botany Department, Faculty of Agriculture (Saba Basha), Alexandria University, 21531 Alexandria, Egypt;6. Plant Pathology Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt |
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| Abstract: | Salicylic acid (SA) is involved in hypersensitive reactions of plants to incompatible pathogens and in systemic acquired resistance (SAR) after the attack of necrosis-inducing pests. The possible involvement of SA in defense responses of tomato to root-knot nematodes (Meloidogyne spp., RKNs) was investigated. SA was found not to be responsible for the inhibition of catalase (CAT) detected in the early stages of Meloidogyne-tomato incompatible interactions. CAT extracted from leaves was inhibited only after treatment of the seedlings with SA concentrations as high as 4 mM. Most of the amount of free SA found in plants after SA treatment was detected in the leaves. SA (0.2 mM) was found to cause a competitive inhibition of CAT only at high substrate (H2O2) concentrations. Under different conditions it did not affect, or even enhanced, the enzyme activity. Therefore, it is suggested that SA-mediated CAT inhibition does not operate early in resistance against RKN in tomato, although it might have a role in the consequent lesion formation. Plant uptake of SA was detected by immersion of roots of 1-month-old seedlings in aqueous solutions of SA and SA plus a soil humic acid. Considering the low level of free SA retained by roots, the capacity of exogenously provided SA to act as an elicitor of resistance to root pests is considered unlikely. |
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