PJB-2017-536
USE OF MODERATE UV-RADIATION AND ABA TO IMPROVE ESTABLISHMENT OF TOMATO PLANTS UNDER WATER DEFICIT CONDITION
Saeid Jalali-Honarmand
Abstract
Because of the fact that more than 85 percent of world water use is in agriculture and to the fact that climate change increases environmental stresses, such as drought, effective water management with improved stress tolerance in crop, is essential. So, a biennial factorial experiment using a randomized complete block design with four replicates was conducted to study effects of moderate ultraviolet radiation (UV-AB and UV-C) at transplanting stage and exogenous application of ABA plant hormone (0 and 10 38?M), on tomato plant under two water conditions (water stress at vegetative + non-water stress). The results showed that, UV radiation had significant effects on antioxidant enzymes, the content of total chlorophyll and carotenoids, anthocyanins content and the traits of cell membrane stability in tomato seedling leaves. Except the content of total chlorophyll, the highest value for other traits was obtained by exposing the tomato seedling to UV-AB radiation. As well, biplot diagrams showed that in both years of the experiment, the treatment combination UV-AB � non-water deficit � ABA was the best in terms of leaf area, performance index, cell membrane stability, total chlorophyll content and shoot dry weight. Also, the treatment combination UV-AB � water deficit � ABA was the best for carotenoid content and dry root weight. It is concluded that exposing tomato seedling to UV-AB is a proper management strategy to improve establishment at transplanting stage and to increase drought resistance in tomato cultivation.
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