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Response of leaf gas exchanges and grain yield of S.C. 704 maize to salicylic acid foliar application under water deficit stress
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Hasan Nouriyani *   |
| Assistant Professor Department of Agronomy and Plant Breeding, Payame Noor University, Iran. |
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Abstract: (1287 Views) |
| In order to investigate the response of leaf gas exchanges and grain yield of SC 704 maize to salicylic acid foliar application under water deficit stress, a split plot experiment carried out based on randomized complete block design with four replications in Dezful region during the summer of 2013. Treatments included water deficit stress (irrigation after 60, 90, 120 and 150 mm evaporation from Class A evaporation pan) in main plots and foliar application of salicylic acid (0, 0.25, 0.5 and 0.75 mM in the 6-8 leaf stage of the plant) were in subplots. The results showed that foliar application of salicylic acid in water deficit stress treatments increased stomatal conductance (53%), transpiration intensity (19%), relative water content (26%), photosynthesis rate (24%), grain yield (35%) and biological yield (27%) and reduced the intercellular CO2 concentration (14%). In general, consumption of salicylic acid in both favorable conditions and water stress improved physiological traits and yield. In the meantime, foliar application of 0.75 mM salicylic acid in irrigation conditions after 60 mm evaporation from Class A evaporation pan with greater water uptake, along with stomatal conductance and higher photosynthetic rate, the relative water content was higher and in this way among other treatments, it had the highest grain yield (7815 kg.ha-1) and biological yield (17867 kg.ha-1) which showed 24.5% and 21.2% superiority compared to the control, respectively. |
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| Keywords: Transpiration, Water stress, Grain yield and Photosynthesis. |
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Full-Text [PDF 953 kb]
(2043 Downloads)
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Type of Study: Applicable |
Subject:
Crop Physiology
Received: 2021/11/7 | Accepted: 2021/07/1 | Published: 2021/07/1
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