Document Type : Full Paper
Authors
1
Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
2
Department of Horticultural Sciences, Faculty of Agriculture, Shahrekord University, Chaharmahal Bakhtiari, Shahrekord, Iran
3
Department of Horticultural Science, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
Abstract
In order to investigate the effect of pinching and foliar spraying of thidiazuron on improving the tolerance to water-deficit stress in pelagonium graveolens plants, a factorial experiment was conducted in the form of a completely randomized design with four replications in the research greenhouses of the Faculty of Agriculture of Lorestan University in 2022. The first factor was water deficit stress (80 (control), 50 and 20% available water in the soil (AWC)), the second factor was pinching and non-pinching, and the third factor included thidiazoron foliar spraying (zero, 5 and 10 mg/liter). The results showed that the stress of water deficit stress had a decreasing effect on the indices of plant height, number of lateral branches, total fresh and dry weight, relative water content and essential oil percentage, but electrolyte leakage, malondialdehyde content and catalase enzyme activity increased. Pinching of plants and foliar application of thidiazuron in the control level decreased the height, number of leaves and the relative water content of the leaves, but they increased total fresh and dry weight, root growth, concentration of photosynthetic pigments and electrolyte leakage. However, under the water deficit stress, plant height, number of lateral branches, number of leaves, root growth, total fresh and dry weight and essential oil yield increased and electrolyte leakage, malondialdehyde content and catalase enzyme activity decreased. In general, the results showed that the treatment of pinching and thidiazoron caused a reduction in the negative effects of water deficit stress by improving the water balance and increasing root growth.
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