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Exogenously Applied Nitric Oxide Enhances Salt Tolerance in Rice (Oryza sativa L.) at Seedling Stage

School of Applied Bioscience, College of Agriculture and Life Science, Kyungpook National University, 80 Daehak-ro, Bukgu, Daegu 41566, Korea
Department of Agriculture, Abdul Wali Khan University, Mardan 23200, Pakistan
Author to whom correspondence should be addressed.
Agronomy 2018, 8(12), 276;
Received: 18 October 2018 / Revised: 21 November 2018 / Accepted: 22 November 2018 / Published: 23 November 2018
(This article belongs to the Section Soil and Plant Nutrition)
Salinity is one of the major abiotic factors that limit rice production worldwide. Previous trends show that salt concentration in rivers is increasing consistently, posing potentially adverse threats in the near future. Thus, crops currently being cultivated, particularly in small-scale farming systems, are under high threat from salinity. In this study, we investigated the mitigating effect of nitric oxide (NO) on salt stress in rice based on the assessment of changes in the transcript levels of different genes and the phenotypic response of rice genotypes. We observed that exogenously applied NO increased the expression levels of OsHIPP38, OsGR1, and OsP5CS2 in the susceptible genotype of rice, whereas in the tolerant genotype, the effect of NO was mainly in counteracting the salt-induced gene expression that diverts cellular energy for defense. Moreover, seedlings that were pretreated with NO showed high biomass production under salt stress conditions, indicating the positive role of NO against salt-induced leaf chlorosis and early senescence. The effect of NO-mediated enhancement was more pronounced in the salt tolerant genotype. Therefore, the use of NO with the integration of tolerant genes or genotypes will enhance salt tolerance levels in rice. View Full-Text
Keywords: NO-induced salt tolerance; salinity mitigation; stress-related genes NO-induced salt tolerance; salinity mitigation; stress-related genes
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Adamu, T.A.; Mun, B.-G.; Lee, S.-U.; Hussain, A.; Yun, B.-W. Exogenously Applied Nitric Oxide Enhances Salt Tolerance in Rice (Oryza sativa L.) at Seedling Stage. Agronomy 2018, 8, 276.

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