Article

Effect of exogenous salicylic acid under changing environment: A review

Plant Physiology Section, Department of Botany, Aligarh Muslim University, Aligarh 202002, U.P., India
Environmental and Experimental Botany (Impact Factor: 3). 03/2010; 68(1):14-25. DOI: 10.1016/j.envexpbot.2009.08.005

ABSTRACT Salicylic acid (SA), an endogenous plant growth regulator has been found to generate a wide range of metabolic and physiological responses in plants thereby affecting their growth and development. In the present review, we have focused on various intrinsic biosynthetic pathways, interplay of SA and MeSA, its long distance transport and signaling. The effect of exogenous application of SA on bio-productivity, growth, photosynthesis, plant water relations, various enzyme activities and its effect on the plants exposed to various biotic and abiotic stresses has also been discussed.

Download full-text

Full-text

Available from: Shamsul Hayat, Jul 07, 2015
3 Followers
 · 
771 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Background and aims In plants, salicylic acid (SA) acting as one of the signaling molecules can regulate and respond to cadmium (Cd) stress. It is well known that hydrogen sulfide (H2S) could alleviate toxicity of Cd stress but the crosstalk between SA and H2S in regulating Cd stress still remains unclear. Methods We studied on it through the physiological and biochemical method together with the microstructure synthesis. Results Our results indicated that the plants exhibited enhanced tolerance to Cd when pretreated with SA, which included weakening oxidative damage and intensifying photosynthesis as well as boosting L-cysteine desulfhydrase (LCD) activity and raising the content of endogenous H2S. In parallel, the plants pretreated with NaHS, a donor of H2S, showed a stronger ability to tolerate Cd stress, SA- pretreated plants presented normal growth and meanwhile the content of chlorophyll and the microstructure of roots were significantly different compared to those treated with Cd only. By contrast, with the same treatments, the positive function and effect of SA on the LCD-knockout mutants, lcd was not observed. Pharmacological experiments further testified these results. Conclusions All of the results suggest that H2S may be a downstream signal molecule in SA-induced Cd tolerance of Arabidopsis.
    Plant and Soil 01/2015; DOI:10.1007/s11104-015-2475-8 · 3.24 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Cadmium, a non-essential and toxic metal, negatively affects plant growth and productivity, and alters the plant's physiological processes necessary for its survival. The present study was designed to explore the individual and combined effects of calcium and salicylic acid (SA) on the morphology and physiology of Brassica juncea L. cv. Varuna under cadmium stress. The application of calcium (2 mM) through the soil and/or SA (10-5 M) as foliar spray enhanced the growth, photosynthetic parameters, and proline content determined after 45 days of treatment. The application of cadmium (6 mg kg-1) through the soil was toxic and decreased both growth and the photosynthetic parameters. The application of calcium and SA in combination was most effective in alleviating the harmful effects of cadmium on growth and photosynthesis. Calcium and SA clearly induced plant protection mechanisms by enhancing proline and chlorophyll accumulation in the leaves.
    Zeitschrift fur Naturforschung C 01/2015; 69(11-12):452-458. DOI:10.5560/ZNC.2014-0036 · 0.57 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We studied the response to moderate drought and re-watering in 55-day-old plants of the lowland cv. Kanlow and the upland cv. Greenville. Plants were grown in a growth chamber; drought treatment was applied by water suppression until moderate stress was reached. The optimal harvest time was determined when the relative water content (RWC) in plants reached an average of 60%. The effects of drought and recovering on growth (i.e. plant height and leaf number), antioxidant enzymes (SOD and CAT), abscisic, salicylic and jasmonic acids levels (ABA, SA, JA), and water stress related genes were analyzed. Drought induced a decrease in growth in cv. Greenville but not in Kanlow. Drought tolerance in cv. Kanlow was correlated with higher antioxidant activities both in stress and recovery. Thus, we investigated stress hormones known to induce reactive oxygen species (ROS). ABA was the main hormone under stress, and increased higher in cv. Kanlow than in cv. Greenville. SA and JA basal levels were higher in well watered plants of cv. Kanlow. At gene levels, RAB18 and RD22 overexpressed after 24 h of re-watering in cv. Kanlow, resembling a “stress memory” mechanism described in other species. Further molecular markers of hormone effects (PR2) or drought (DREB2) well known in dicots seem not to be specific for Panicum virgatum. Overall, we found that cultivar Kanlow has an effective machinery of stress response, which makes it promising to be grown successfully in semi-arid regions.
    Biomass and Bioenergy 07/2014; 66. DOI:10.1016/j.biombioe.2014.03.004 · 3.41 Impact Factor