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Cross‐talk between salicylic acid and NaCl‐generated reactive oxygen species and nitric oxide in tomato during acclimation to high salinity
Author(s) -
Gémes Katalin,
Poór Péter,
Horváth Edit,
Kolbert Zsuzsanna,
Szopkó Dóra,
Szepesi Ágnes,
Tari Irma
Publication year - 2011
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2011.01461.x
Subject(s) - salicylic acid , reactive oxygen species , acclimatization , abscisic acid , hydrogen peroxide , salinity , nitric oxide , chemistry , catalase , solanum , horticulture , oxidative stress , botany , biochemistry , biology , ecology , organic chemistry , gene
Hydrogen peroxide (H 2 O 2 ) and nitric oxide (NO) generated by salicylic acid (SA) are considered to be functional links of cross‐tolerance to various stressors. SA‐stimulated pre‐adaptation state was beneficial in the acclimation to subsequent salt stress in tomato ( Solanum lycopersicum cv. Rio Fuego). At the whole‐plant level, SA‐induced massive H 2 O 2 accumulation only at high concentrations (10 −3 –10 −2 M ), which later caused the death of plants. The excess accumulation of H 2 O 2 as compared with plants exposed to 100 m M NaCl was not associated with salt stress response after SA pre‐treatments. In the root tips, 10 −3 –10 −2 M SA triggered the production of reactive oxygen species (ROS) and NO with a concomitant decline in the cell viability. Sublethal concentrations of SA, however, decreased the effect of salt stress on ROS and NO production in the root apex. The attenuation of oxidative stress because of high salinity occurred not only in pre‐adapted plants but also at cell level. When protoplasts prepared from control leaves were exposed to SA in the presence of 100 m M NaCl, the production of NO and ROS was much lower and the viability of the cells was higher than in salt‐treated samples. This suggests that, the cross‐talk of signalling pathways induced by SA and high salinity may occur at the level of ROS and NO production. Abscisic acid (ABA), polyamines and 1‐aminocyclopropane‐1‐carboxylic acid, the compounds accumulating in pre‐treated plants, enhanced the diphenylene iodonium‐sensitive ROS and NO levels, but, in contrast to others, ABA and putrescine preserved the viability of protoplasts.