Abstract
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.
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Abbreviations
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- CK:
-
control without methanol
- E :
-
transpiration rate
- Fv/Fm :
-
maximal quantum yield of PSII photochemistry
- M10:
-
10% methanol treatment
- M20:
-
20% methanol treatment
- M30:
-
30% methanol treatment
- MS:
-
mild water stress
- NS:
-
no water stress
- P N :
-
net photosynthetic rate
- ROS:
-
reactive oxygen species
- RuBP:
-
ribulose-1,5-bisphosphate
- S1:
-
seedling stage
- S2:
-
early flowering stage
- S3:
-
early podding stage
- SS:
-
severe water stress
- TChl:
-
total chlorophyll content
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Armand, N., Amiri, H. & Ismaili, A. The effect of methanol on photosynthetic parameters of bean (Phaseolus vulgaris L.) under water deficit. Photosynthetica 54, 288–294 (2016). https://doi.org/10.1007/s11099-015-0178-2
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DOI: https://doi.org/10.1007/s11099-015-0178-2