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

Abstract

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.

Cross-talk of calcium-dependent protein kinase and MAP kinase signaling

“…Wounding or overexpression of pathogen-induced MYB transcription factors increases salt tolerance in tomato 48 and CDPK activities were found to be involved in this cross-tolerance. 49 In Arabidopsis, the expression of active AtMKK9 induces ethylene and camalexin biosynthesis and increases salt sensitivity. 50 Initially, many MAPKs and CDPKs have been cloned based on their identification as stress-responsive genes or in functional genetic screens for altered stress tolerance.…”

Characterization of potato (Solanum tuberosum) and tomato (Solanum lycopersicum) protein phosphatases type 2A catalytic subunits and their involvement in stress responses

“…Detached leaXets of soil-grown plants with their corresponding petioles were used for some experiments. Prior to stress treatments, detached leaXets were placed in individual containers with water at 22°C in a growth chamber for 48 h, to allow the wound-response components induced by leaXet excision to be restored to basal levels (Capiati et al 2006). For elicitor treatment, leaXets were placed in buVer Tris-HCl 50 mM pH 6.5, instead of water, to avoid pH decrease when elicitor solutions were added.…”

Effects of Global Warming Simulated Temperature and Water Stress on Fruit Quality of Tomato (<em>Lycopersicum esculantum</em>) Var. Rajitha

“…The response of plants to environmental stresses depends on the plant developmental stage and the length and severity of the stress (Bray et al, 2002). Plants may respond similarly to avoid one or more stresses through morphological or biochemical mechanisms (Capiati et al, 2006). Environmental interactions may make the stress response of plants more complex or influence the degree of impact of climate change.…”

“…Until now, the scientific information on the effect of environmental stresses on vegetables is limited. There is a need to do more research on how vegetable crops are affected by increased abiotic stresses as a direct potential threat from climate change (Capiati et al, 2006). Therefore, this study was designed to identify the effect of simulated temperature and water stress on quality of fruits produced by tomato plants (var.…”