Jasmonic acid differentially affects growth, ion uptake and abscisic acid concentration in salt-tolerant and salt-sensitive rice cultivars

• Published in: Journal of agronomy and crop science (1986) Vol. 191; no. 4; pp. 273 - 282
• Main Authors: Kang, D.J, Seo, Y.J, Lee, J.D, Ishii, R, Kim, U, Shin, D.H, Park, S.K, Jang, S.W, Lee, I.J
• Format: Journal Article
• Language: English
• Published: Berlin, Germany Blackwell Verlag 01-08-2005; Blackwell
• Subjects: abscisic acid; Adaptation to environment and cultivation conditions; Agronomy. Soil science and plant productions; Biological and medical sciences; calcium; chemical constituents of plants; cultivars; dry matter accumulation; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; grain crops; ion transport; ion uptake; jasmonic acid; leaf photosynthesis; leaf water potential; length; magnesium; maximum quantum yield of PSII (Fv/Fm); Oryza sativa; photosynthesis; photosystem II; plant growth; potassium; rice; roots; salt stress; salt tolerance; seedlings; sodium chloride; Varietal selection. Specialized plant breeding, plant breeding aims; Monocotyledones; Environmental factor; Cereal crop; Oryza sativa; Photosystem 2; Salt; Absorption; Gramineae; Sesquiterpenes; Agronomy; maximum quantum yield of PSII (Fv/Fm); Angiospermae; Abscisic acid; Plant growth substance; Jasmonic acid; Growth inhibitor; Terpenoid; Halotolerance; ion uptake; leaf water potential; Ions; Plant leaf; Concentration; leaf photosynthesis; Water potential; Quantum yield; Salinity; Spermatophyta; Photosynthesis; Cultivar
• ISSN: 0931-2250; 1439-037X
• DOI: 10.1111/j.1439-037X.2005.00153.x

Phytohormones play critical roles in regulating plant responses to stress. Here, we investigated the effects of salt stress and stress recovery by applying jasmonate to the two different rice (Oryza sativa L.) cultivars Dongjinchalbyeo (DJC, salt‐tolerant) and Dongjinbyeo (DJ, salt‐sensitive). Salt stress remarkably decreased the root length of plants even at low NaCl concentration (20 mm). Salt stress led to a sharp increase in the concentrations of abscisic acid (ABA) in 20 and 40 mm NaCl, when compared with the control values. The concentrations of ABA in the salt‐tolerant cultivar DJC plants progressively increased with increasing NaCl levels, whereas in the salt‐sensitive cultivar DJ, they sharply decreased in all three parts of rice plants at 80 mm NaCl treatment. The decrease of jasmonic acid (JA) concentrations in salt‐tolerant cultivar DJC was lesser than in the salt‐sensitive cultivar DJ plants in the shoot. Post‐application in the stressed plants with 30 μm JA at 24 and 48 h after NaCl treatment, recovered salt inhibition on dry mass production more effectively than application of JA at 48 and 24 h before salt stress, and during salt stress simultaneously. The uptake of Na decreased especially in the salt‐sensitive cultivar DJ plants, whereas there was an increase in Ca and Mg levels and slight increase of K by JA application. Leaf water potential, leaf photosynthetic rate, and maximum quantum yield of photosystem II (PSII) also remarkably recovered when 30 μm JA was applied 24 h after the salt stress compared with the 40 mm NaCl‐treated plants. These results clearly indicate that post‐application with exogenous JA can ameliorate salt‐stressed rice seedlings, especially the salt‐sensitive cultivar rather than the salt‐tolerant cultivar. This may change the balance of other endogenous plant hormones.