Alleviative effects of chitosan or humic acid on Vitex trifolia ‘Purpurea’ grown under salinity stress

Abstract

Pots experiment was conducted to investigate the effect of bio-stimulators chitosan (CHT) or humic acid (HA) on Vitex trifolia ‘Purpurea’ exposed to salinity stress. Salinity stress was imposed by irrigation with saline water at concentration of 1000, 2500 and 5000 ppm, in addition to control (280 ppm), plants exposed to salinity were sprayed every 4 weeks with either CHT at concentrations of 30, 60 and 90 ppm or HA at concentrations of 1000, 1500 and 2000 ppm, while control plants sprayed only with tap water. The results showed that, with increasing salinity stress all vegetative growth parameters were decreased and chemical constituents including total chlorophylls total carbohydrates, K+ %, Ca2+ % and K+/Na+ ratio were reduced. In contrast, elevating salinity stress increased contents of proline, total phenolic, Na+ %, Cl− %. On the other hand, foliar application of either CHT or HA had favorable impact on increasing vegetative traits and chemical compositions, meanwhile reducing accumulation of total phenolic, Na+ and Cl− % toxic ions in leaves, HA was generally more effective than CHT. Based on the results, it can be recommended that, CHT or HA at high concentration was the best effective treatments; however, HA was superior and economic treatment recommended for alleviating the adverse impact of salinity stress on Vitex trifolia ‘Purpurea’ plants irrigated with saline water at concentration up to 5000 ppm.

Chitosan-Magnesium Oxide Nanoparticles Improve Salinity Tolerance in Rice (Oryza sativa L.)

“…11 Foliar spraying of chitosan increased the ratio of K + /Na + under salt stress by acting as a stimulator. 25 The functions of chitosan NPs and their modified forms on the balance of K + /Na + under HS stress in plants are rarely studied.…”

“…Liu et al found that cerium oxide NPs enhanced the HS tolerance by regulating the activities of KOR (K + outward rectifying channels) and HKT1 (high-affinity K + transporter) to keep K + retention in cotton mesophyll cells and reducing the overdose reactive oxygen species (ROS) in cotton seedlings . Foliar spraying of chitosan increased the ratio of K + /Na + under salt stress by acting as a stimulator . The functions of chitosan NPs and their modified forms on the balance of K + /Na + under HS stress in plants are rarely studied.…”

Alleviation of Salt Stress with Chitosan Foliar Application and Its Effects on Growth and Development in Tomato (Solanum lycopersicum L.)

“…İD İD Vijayakumari et al, 2016), chitosan (Rashidi et al, 2020), salicylic acid (Hayat et al, 2010) and many other known and newly identified compounds (Valluru et al, 2016;Ashour et al, 2021;Sheikhalipour et al, 2021;Ayed et al, 2022) are reported to enhance growth, development and stress tolerance levels in crops. Therefore, priming, foliar spraying, or other external field applications of these compounds are of great importance for agricultural sustainability (Singh et al, 2015;Pawar and Laware, 2018;Zulfiqar, 2021).…”

Response of NaCl and Brassinolide in Stevia rebaudiana under in vitro Condition

“…Several investigations on the impact of salt on stevia have recently been conducted and found to be influenced by varying degrees of salinity, indicating that this plant is relatively sensitive to salt stress [5][6][7][8][9]. Salt-stressed plants have fewer shoots, smaller dry leaves, and stunted growth, as well as the breakdown of plant pigments such as chlorophyll and carotenoids, which disrupt the photosynthetic machinery and impede overall growth [10,11]. As a result, it is critical to develop a new strategy for increasing plant salinity resistance.…”