The Effect of Exogenous Applications of Salicylic Acid on Drought Tolerance and Up-Regulation of the Drought Response Re
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J. Crop Sci. Biotech. 2019 (March) 22 (1) : 37 ~ 45 DOI No. 10.1007/s12892-017-0180-0 RESEARCH ARTICLE
The Effect of Exogenous Applications of Salicylic Acid on Drought Tolerance and Up-Regulation of the Drought Response Regulon of Iraqi Wheat Fakhriya Kareem*, Hail Rihan, Michael P. Fuller School of Biological and Marine Sciences, Faculty of Science and Engineering, Plymouth University, Plymouth, Devon PL4 8AA, UK Received: December 28, 2017 / Revised: April 27, 2018 / Accepted: June 02, 2018 Ⓒ Korean Society of Crop Science and Springer 2019
Abstract Drought is a major limiting factor of wheat production globally. In this research, salicylic acid was used in order to increase drought tolerance in Tamooz 2 of Iraqi wheat. It was observed that the SA treatment had animportant positive impact on the final wheat biomass and on the yield components (spike drying weight, grain dry weight, 1000 grain dry weight). The significant positive role of SA treatment on the up-regulation of CBF14 gene was confirmed. The expression of CBF14 was significantly affected by the developmental stage of wheat plants and the period between SA spray and sampling. We believe that results obtained in this study help to understand more deeply the molecular mechanism of drought tolerance in wheat. It could also have important practical applications, especially for wheat growers in dry climates. Key words : Salicylic acid, drought tolerance, CBF/DREB, wheat, abiotic stress and growth stages.
Introduction Recently a lot of research has been focused on the influence of drought stress on plant growth and crop productivity and has revealed that crop plants vary in their response to water deficit depending on the severity of the stress and also the stage of plant development at which stress occurs (Claassen and Shaw 1970; Gupta et al. 2001). The sensitivity of crops to damage from low soil moisture supply at different stages of growth has previously been reported for maize (Zea mays L.) (Denmead and Shaw 1960; Li-Ping et al. 2006) and showed that plants were apparently least affected by moisture stress imposed during the vegetative growth season, and although the plants in this duration appeared to recover from damage, the imposed stress could still result in reductions in grain yield at a later period. The physiological mechanisms of plant responses to drought stress in semi-arid conditions are characterized by reduction of the transpiration process through closing the stomata which in turn affects the movement of CO2 into the plant and also it associated with a decrease of the leaf area in Fakhriya Kareem () Email: [email protected]
The Korean Society of Crop Science
order to maintain high tissue water potential and protect the metabolic process functions from the damage effects caused by the stress (Chapin et al. 1993; Chaves et al. 2009; Flexas et al. 2006; Hsiao 1973). Plants ability to cope with abiotic stresses such as drought, salinity, and cold is not only associated with physiological mechanisms but is directed by molec
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