Interaction of Methanol Spray and Water-Deficit Stress on Photosynthesis and Biochemical Characteristics of Phaseolus vulgaris L. cv. Sadry.
This study was a factorial experiment with a completely randomized design and three replications. The four levels of methanol spraying were used. Spraying was carried out three times during the growing season at 10-day intervals beginning at 4 weeks after sowing. The spraying of solution continued until saturation of droplets on the leaves was achieved. The levels of water-deficit stress applied were nonstress, moderate water stress and severe water stress. The results showed that there was a significant difference (P ≤ 0.05) between the methanol and water-deficit stress treatments for chlorophyll (Chl) a and Chl b, carotenoid, total chlorophyll, net photosynthesis (PN ), intercellular CO2 (Ci ), maximal quantum yield of photosystem II photochemistry (Fv /Fm ), leaf moisture, water use efficiency and relative water content. The application of foliar methanol at all levels of water-deficit stress significantly decreased the catalase activity of the roots. Under all levels of water-deficit stress, the 30% (v/v) methanol treatment significantly decreased peroxidase activity in the roots over that for the control. The results suggest that foliar application of methanol can decrease the negative effects of water-deficit stress on Phaseolus vulgaris L. cv. Sadry.
Faculty of Sciences, Lorestan University, Khorram Abad, Iran.
Nezam
N
Armand
Department of Biology, Faculty of Sciences, Lorestan University, Khorram Abad, Iran.
Hamzeh
H
Amiri
Faculty of Agriculture, Lorestan University, Khorram Abad, Iran.
Ahmad
A
Ismaili
D000432:Methanol / Q000737:chemistry*; D027805:Phaseolus / Q000378:metabolism / Q000502:physiology*; D010788:Photosynthesis; D010860:Pigments, Biological / Q000378:metabolism; D013312:Stress, Physiological
D010860:Pigments, Biological; D000432:Methanol