Wounding increases salt tolerance in tomato plants: evidence on the participation of calmodulin-like activities in cross-tolerance signalling

• Published in: Journal of experimental botany Vol. 57; no. 10; pp. 2391 - 2400
• Main Authors: Capiati, Daniela Andrea, País, Silvia Marina, Téllez-Iñón, María Teresa
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.01.2006; Oxford Publishing Limited (England)
• Subjects: Abscisic Acid - physiology; Adaptation to environment and cultivation conditions; Adaptation, Physiological - physiology; Agronomy. Soil science and plant productions; biochemical pathways; Biological and medical sciences; calmodulin; Calmodulin - physiology; Calmodulin-like activities; cross-tolerance; Cyclopentanes - metabolism; Fundamental and applied biological sciences. Psychology; gene expression; Gene Expression Regulation, Plant; genes; Genes, Plant; Genetics and breeding of economic plants; Insect genetics; Leaves; Lycopersicon esculentum; Lycopersicon esculentum - genetics; Lycopersicon esculentum - physiology; mechanical damage; Oxylipins; Peptides - physiology; Plant cells; plant damage; Plants; Protease inhibitors; protein kinases; Protein Kinases - metabolism; Research Papers; RNA; Salinity; salt stress; Salt tolerance; Salts; signal peptide; signal transduction; Signal Transduction - physiology; Sodium Chloride - metabolism; Solanum; Solanum lycopersicum var. lycopersicum; Table salt; tomato; tomatoes; Varietal selection. Specialized plant breeding, plant breeding aims; wounding; Calmodulin-like activities; salt stress; cross-tolerance; tomato; wounding; Enzyme; Transferases; Tolerance; Stress; Salinity; Peptidases; Gene; Protein kinase; Dicotyledones; Angiospermae; Lycopersicon esculentum; Hydrolases; Spermatophyta; Solanaceae; Calmodulin
• ISSN: 0022-0957; 1460-2431
• DOI: 10.1093/jxb/erj212

Cross-tolerance is the phenomenon by which a plant resistance to a stress results in resistance to another form of stress. It has previously been shown that salt stress causes the accumulation of proteinase inhibitors and the activation of other wound-related genes in tomato plants (Solanum lycopersicum). However, very little is known about how different stresses interact with one another, and which are the signalling components that interrelate the responses triggered by different stress types. In the present work, it is shown that mechanical wounding increases salt-stress tolerance in tomato plants through a mechanism that involves the signalling peptide systemin and the synthesis of JA. Data are also provided indicating that calmodulin-like activities are necessary for the downstream signalling events that lead to cross-tolerance between wounding and salt stress. Finally, evidence was gathered supporting the hypothesis that LeCDPK1, a Ca2+-dependent protein kinase from tomato previously described in our laboratory, could participate in this cross-tolerance mechanism interrelating the signalling responses to wounding and salt stress.