Influence of ascorbic acid and 24-epibrassinolide on physiological characteristics of pot marigold under water-stress condition

Abstract

Water deficit is considered as a major limiting environmental factor for plant growth and yield. To ameliorate the adverse effects of water restriction, an experiment was conducted in the research field of Mohaghegh Ardabili University in two successive years (2014 and 2015). Foliar spraying of different concentration of epibrassinolide (EBL) (0, 10 −8 , and 10 −7 M) and ascorbic acid (AsA) (0 and 10 mM) was carried out and water-stress trials included 50 and 100 mm evaporation from class A pan. Water stress significantly enhanced essential oil content, but reduced capitula yield and relative water content (RWC) of leaves. Water-stress damage ameliorated by foliar application of 10 mM AsA with 10 −7 M EBL and the essential oil yield and antioxidant enzymes activity improved significantly. Enhancing of malondialdehyde (MDA) content and electrolyte leakage indicates that water-deficit stress caused oxidative damage to the membrane by enhancing hydrogen peroxide (H 2 O 2) level. Combined-application of regulators significantly declined the amounts of H 2 O 2, MDA, and electrolyte leakage under water stress. Antioxidant enzymes activity and also proline and protein content were enhanced by drought stress as well as regulators. Also, the application of EBL and AsA induced tolerance to water deficit and reduced the reactive oxygen species by increasing antioxidant enzymes activity and osmotic adjustment.

Changes in Growth, Physiology, and Fatty Acid Profile of Rapeseed Cultivars Treated with Vermicompost Under Drought Stress

“…RWC is a key indicator to describe the water relation and physiological function in plants. Previous studies showed RWC as an eminent trait to measure stress tolerance (Hemmati et al 2018;Dapanage and Bhat 2018). We observed the high RWC in Zafar and Hyola4815.…”

Role of Ascorbic acid, Glutathione and Proline Applied as Singly or in Sequence Combination in Improving Chickpea Plant through Physiological Change and Antioxidant Defense under Different Levels of Irrigation Intervals

“…Similar results have been reported by Medeiros et al [57], who found that there was an increase in APX activity in sugarcane using 20 mM proline. Furthermore, ASA foliar application increased CAT, SOD and Calendula POX activity [58]. Increased CAT, SOD and POX activity could effectively detoxify harmful ROS effects [59].…”

Effects of 24‐epibrassinolide on plant growth, antioxidants defense system, and endogenous hormones in two wheat varieties under drought stress

“…BRs significantly increased the water uptake and membrane stability with higher carbon dioxide and nitrogen assimilation in wheat plants under stress that can be seen in response to drought tolerance only (Krishna, 2003; Wang et al ., 2015). Another piece of evidence indicated that EBL application can improve plant photosynthetic pigments, osmolytes production, antioxidant enzyme activities, and seed yield under drought stress (Hemmati et al ., 2018; Zafari et al ., 2020). However, the research regarding the effects of EBL under drought stress in plants, especially, in wheat needs more attention.…”