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Title: Effect of Salicylic Acid on Wheat Yield and its Components under Drought Stress
Authors: Sharafizad; Ahmad Naderi; Seyed Ata Siadat; Tayeb Sakinejad; Shahram Lak
Aff: Department of Agronomy and plant breeding, Dezful Branch, Islamic Azad University khouzestan, Iran
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Keywords: Growth Regulat:; Triticum Aestivum; Abiotic Stress; Yield Component
Abstract:Plants in the natural environments are exposed to different kinds of stress such as salinity and drought stress which can limit plant growth. Plants have different biological pathways and mechanisms to overcome such stresses like morphological, physiological and molecular responses. Salicylic Acid is a plant growth regulator which could affect florescence, cell division, ion transport, stomata closure and seed germination. In order to investigate the effect of salicylic acid on total yield and yield component of wheat under stress conditions an experiment was conducted based on split factorial plot design with three replications. The first treatment was drought stress at three levels (control, drought stress in Anthesis/heading and drought stress in grain filling stage). and second treatment was application of salicylic acid as a priming agent, foliar application at beginning of tillering and foliar application of salicylic acid at beginning of flowering, and the third treatment was different dosages of salicylic acid (0, 0.7, 1.2 and 2.7 mmol). Results of the experiment showed that drought stress could decreased harvest index, grain yield and the number of grains in spikes. Application of 0.7 mmol Salicylic acid exhibited the highest biological yield, number of grain and total grain yield (6852 kg/ha) comparedto control (5228 kg/ha).