Document Type : Research Paper
Authors
1 Department of Agricultural Sciences, Payame Noor University, Tehran, Iran.
2 Department of Agricultural Sciences, Payame Noor University, Tehran, Iran
3 Assistant Professor, Department of Water Engineering and Agricultural Management, Faculty of Agriculture and Natural Resources, Mohaghegh Ardabili University, Ardabil, iran
Abstract
Water deficit has adverse effects on plant growth and yield and the application of growth-regulators increases the tolerance of plants to drought stress. Due to the low water resources in Iran and the use of coriander in the different industries, a field experiment was carried out as a split-plot based on an RCB design with three replications in 2020, to evaluate some physiological changes, yield and yield components, essential oil and water use efficiency (WUE) of coriander, in response to water limitation and salicylic acid (SA) and brassinosteroid treatments. Irrigation intervals (irrigation after 70, 100, 130 and 160 mm evaporation from class A pan) were assigned to main plots and foliar application treatments (control, SA (1 mmolar) and brassinosteroid (1 μmolar)) were allocated to sub-plots. Water stress reduced the relative water content, membrane stability index and leaf area index by 18.4, 12.8 and 15.1 percent, respectively, compared to well-irrigation. The mean of these traits increased with the application of SA and brassinosteroid. Drought stress reduced the number of umbels per plant, grains per umbels, grain per plant, biological and grain yield. Foliar application of SA and brassinosteroid caused a significant increase in the number of umbels per plant (14.1 and 7.3 percent respectively), biological (21.9 and 10.2 percent respectively) and grain (18.6 and 9.6 percent respectively) yield. Under drought stress, the essential oil percentage increased (36.9 percent), but the essential oil yield decreased (67.8 percent).
Keywords
)