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۱Influence of salicylic acid pre–treatment on emergence and early seedling growth of cucumber (Cucumis sativus)under salt stress
نویسنده(ها): ،
اطلاعات انتشار: International Journal of Plant Production، هفتم،شماره۲(پياپي ۲۴)، Apr ۲۰۱۳، سال
تعداد صفحات: ۲۰
Salicylic acid (SA) is a common, plant–produced signal molecule that is responsible for inducing tolerance to a number of biotic and abiotic stresses. An experiment was therefore conducted to test whether the application of SA at various concentrations (0, 0.25, 0.50 or 1.0 mM) through a seed–soaking method would protect cucumber (Cucumis sativus L.) seedlings subjected to salt stress. After soaking, seeds were sown in plastic trays filled with washed fine sand. The trays were then placed in the greenhouse and watered with different NaCl solutions (0, 50, 100 and 150 mM), for a period of 4 weeks. SA improved the majority of physiological (relative leaf chlorophyll content, leaf relative water content and chlorophyll fluorescence ratio) and morphological parameters (total emergence, mean emergence time, shoot and root dry weights) of cucumber seedlings subjected to salt stress. SA improved the injuries caused by salt stress by promoting K+ accumulation and preventing increases in leaf electrolyte leakage and Na+ contents of leaves and roots. The best protection appeared to be obtained from SA applied by seed–soaking method at 1.00 mM.

۲Use of Olive Cultivars in Landscape Planning Regarding Form and Texture
نویسنده(ها): ، ، ،
اطلاعات انتشار: Journal of Agricultural Science and Technology، هفدهم،شماره۳، ۲۰۱۵، سال
تعداد صفحات: ۸
Olive is a perennial evergreen tree which has good adaptability to poor environmental conditions such as salt and drought resistance. In recent years, there is a tendency to plant olive trees in green spaces. Therefore, this study was carried out to evaluate 15 olive cultivars regarding growth habit, form, and texture to recommend for landscape. Six–year–old trees of 15 olive cultivars, which had been planted in Isfahan University of Technology (2000), were used in randomized block design with 3 replications and some of their vegetative characters were measured. A cluster analysis was done using seven factors effective on tree texture, which divided cultivars into 3 groups and a separate genotype. Also, another cluster analysis done on the seven factors effective on tree form classified olive cultivars in 3 groups. In short, Manzanilla, Spain, and Amphisis cultivars performed wide oval form and fine–medium coarse texture, so they could be used as background tree, screen, and group planting in green spaces. Roughani, Mishen, Valanolia, Gorgan, Kroneiki, Zard, and Sevillana cultivars showed round form and medium texture which could be used as specimen tree to plant in lawn. Rashid cultivar with long height, long oval form, and coarse texture is suitable as accent, screen, and frame plant.
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