Effect of glutathione spray on the growth of three genotypes of Cucumis sativus L. affected by water stress

Abstract

Experiment was conducted during spring season 2017 in the experimental station of the Department of Horticulture and Landscape, College of Agriculture Diyala University, Iraq. In order to understand some of the effects and adaptations of the vegetative growth of the cucumber plant affected by water stress and the experiments were arranged in a Split-Split Plot Design in R.C.B.D. and with three replicates. The experiment factors were as follows: the genotypes of cucumbers, namely Demmy (V₁) and Ghazeer (V₂) and Wesam (V₃), and second: two levels of irrigation are Complete irrigation 100% (I₁) of field capacity and 50% of complete irrigation (I₂). Third, spray glutathione in three concentrations (0, 50, 100) mg L^-1 and its symbol (G₀, G₁, G₂). The results of the study showed the superiority of the genotype plants in the number of leaves and leafy area (91.72 leaves plan^-1 and 213.9 dcm² plants^-1) respectively. whereas the irrigated plants exceeded the level 100% significantly for all studied traits compared with the level of irrigation 50%. Also, the glutathione spray levels exceeded 50 and 100 mg L^-1 (without significant difference between them) by all the characteristics compared to the comparison treatment (G₀). The results of the triple interference between the genotypes, irrigation levels, and levels of glutathione spraying showed significant differences in the vegetative growth of cucumber plants, Since the treatment of interference V₃I₁G₂ was superior to the number of branches (5, 766 branches plant^-1), the total paper area (239.0 dcm ² plants^-1) and the concentration of chlorophyll (45.72 spad), While treatment V₃I₁G₁ was superior to the number of leaves (99.66 leaves per plant^-1) and dry matter percentage in the vegetative total(16.00%), and treatment V₂I₁G₂ to excellence in plant length (148.6 cm).