, Volume 54, Issue 2, pp 288–294 | Cite as

The effect of methanol on photosynthetic parameters of bean (Phaseolus vulgaris L.) under water deficit

  • N. Armand
  • H. Amiri
  • A. Ismaili
Original papers


Water availability is the main factor limiting crop growth and productivity in dry regions. This study was carried out in order to determine the effect of spraying methanol solution on the photosynthetic characteristics of bean plants. The main aim of our experiment was to improve plant performance under stress caused by water shortage. Two factors were involved: water-deficit stress, such as severe stress (25% of field capacity), mild stress (75% of field capacity), and no stress (100% of field capacity), and application of methanol solution spray at four concentrations: control (without spraying), 10, 20, and 30%. Methanol was applied three times at different growth stages (seedling, flowering, and podding stage) in 10-d intervals. The treatment with 20% methanol at the seedling stage resulted in increased net photosynthesis (P N), intercellular CO2 concentration (C i), and decreased transpiration rate (E) under no stress and mild stress conditions. Under severe stress, 10 and 20%-methanol treatments resulted in increased C i, maximal quantum yield of PSII photochemistry, and decreased E. At the flowering stage, methanol treatments resulted in decreased E and increased C i under mild and severe stress. At the podding stage, 10 and 20%-methanol treatments resulted in increased P N, C i, and total chlorophyll content under mild stress. In conclusion, we suggested that foliar application of methanol had a positive role in enhancing photosynthetic performance.

Additional key words

chlorophyll fluorescence gas exchange maximal quantum yield of PSII physiological characteristics 





intercellular CO2 concentration


control without methanol


transpiration rate


maximal quantum yield of PSII photochemistry


10% methanol treatment


20% methanol treatment


30% methanol treatment


mild water stress


no water stress


net photosynthetic rate


reactive oxygen species




seedling stage


early flowering stage


early podding stage


severe water stress


total chlorophyll content


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Copyright information

© The Institute of Experimental Botany 2016

Authors and Affiliations

  1. 1.Department of Biology, College of SciencesLorestan UniversityKhorramabadIran
  2. 2.Department of Agronomy and Plant Breeding, College of AgricultureLorestan UniversityKhorramabadIran

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