Research Article Open Access

Physiological Response of Soybean (Glycine max) to Foliar Application of Methanol Under Different Soil Moistures

Farzad Paknejad1, Mojtaba Mirakhori1, Majid Jami Al-Ahmadi2, Mohammad Reza Tookalo1, Ali Reza Pazoki1 and Parisa Nazeri1
  • 1 Islamic Azad University, Iran
  • 2 The University of Birjand, Iran


Problem statement: Many cultivated area are situated in arid zone, where crop photosynthesis and productivity has limited by drought. Thus any treatment, such as methanol, that improve plant water relation and reduce stress impacts, could be benefit. Approach: In order to investigate effects of methanol application on some physiological properties of soybean under low water stress, a factorial experiment was done at Research Field of Faculty of Agriculture and Natural Resources, Islamic Azad University-Karaj Branch, Karaj, Iran, during 2008, based on a randomized complete block design with three replications. The first factor was different levels of methanol equal to 0 (control), 7, 14, 21, 28 and 35 volumetric percentage (v/v), which were used as foliar applications at three times during growth season of soybean, with 15 days intervals. The second factor was water stress conditions in two levels, based on depletion of 40 and 70% of available soil moisture. Some traits such as Grain Yield, Relative Water Content (RWC), chlorophyll fluorescence parameters and chlorophyll content were measured, one day before and after the third methanol application. Results: Chlorophyll content (Chl), GY, Electrolytes Leakage at second sampling, photochemical capacity of PSII (Fv/Fm), maximum and variable fluorescence (Fm and Fv, respectively) were affected by water stress significantly (p<0.05). As drought severity was increased, mean values of photochemical capacity of PSII, Chl and RWC tend to decline, whereas minimum fluorescence (F0) and Electrolytes Leakage were increased. Methanol foliar application influenced significantly (p<0.05) Chl, RWC, Grain Yield, and all fluorescence parameters. There was a positive, high correlation between GY with maximum fluorescence, photochemical capacity and also Chl and RWC in both samplings. Conclusion: It seems applying methanol on water stressed soybean plants can reduce harmful effects of drought and improve plant potential to cope with stress.

American Journal of Agricultural and Biological Sciences
Volume 4 No. 4, 2009, 311-318


Submitted On: 11 November 2009 Published On: 31 December 2009

How to Cite: Paknejad, F., Mirakhori, M., Al-Ahmadi, M. J., Tookalo, M. R., Pazoki, A. R. & Nazeri, P. (2009). Physiological Response of Soybean (Glycine max) to Foliar Application of Methanol Under Different Soil Moistures. American Journal of Agricultural and Biological Sciences, 4(4), 311-318.

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  • Chlorophyll content
  • chlorophyll fluorescence
  • drought stress
  • grain yield
  • relative water content