Effect of seaweed extract (Ulva rigida) on the water deficit tolerance of Salvia officinalis L

Abstract

The present investigation examined the effect of a seaweed extract (SWE) of Ulva rigida applied at different concentrations: 25, 50, and 75 % to sage plant (Salvia officinalis L.) subjected to drought stress tolerance. Three watering treatments, without stress (WS), moderate water deficit (MWS), and severe water deficit (SWD) corresponding respectively to 82, 18, and 7 % field capacity (FC), were used to understand the metabolic and physiological changes of Salvia plant during water deficit. SWE application enhanced vegetative growth in sage plants under drought stress conditions. The shoot length, total leaf area, and number were significantly reduced under water stress treatment. All SWE concentrations enhanced these growth parameters under water deficit. Maximal shoot number was observed with application of 25 % U. rigida extract under MWD that resulted in increases of 40 % compared to the control plants. Water stress increased glycine betaine (GB) content, that was significantly reduced by all concentration of SWE applied. The maximum reduction of GB was observed with the 50 % SWE treatment. The lipid peroxidation was less pronounced in droughtstressed plants treated with SWE. The lowest content of malondialdehyde (MDA) was in non-stressed plants and 50 % SWE treatment. The total phenolic content was reduced in plants with increased water deficit intensity (30 % reduction of TFC under SWD) but improved by all concentrations of SWE applied. Drought stress increased the superoxide dismutase (SOD) activities when compared to control. There was a significant enhancement of SOD activity and ascorbate peroxydase (APX) activity when sage plants were treated by SWE under deficit water. The beneficial effect of SWE varied with extract concentrations applied. No significant effect was observed with treatment of SWE. Results indicated that seaweed extract of U. rigida application to medicinal plant S. officinalis under water resulted in amelioration of drought stress and helped in enhancement of antioxidant potential and drought tolerance.

A Biostimulant Based on Seaweed (Ascophyllum nodosum and Laminaria digitata) and Yeast Extracts Mitigates Water Stress Effects on Tomato (Solanum lycopersicum L.)

“…On the one hand, seaweed extracts are among the most common substances used as biostimulants and they might play a role in counteracting drought stress [35]. Indeed, Ascophyllum nodosum extracts have been shown to enhance drought tolerance in tomato [36], soybean [37], bean [38], and Salvia officinalis [39], by modulating the osmotic and antioxidant response to…”

“…On the one hand, seaweed extracts are among the most common substances used as biostimulants and they might play a role in counteracting drought stress [35]. Indeed, Ascophyllum nodosum extracts have been shown to enhance drought tolerance in tomato [36], soybean [37], bean [38], and Salvia officinalis [39], by modulating the osmotic and antioxidant response to stress. On the other hand, yeast extracts are substances known to increase the yield and quality of different crops, including tomato [40], orange [41] and wheat [42], under both control and stress conditions.…”

Effect of pellets made of waste materials from the paper industry enhanced with seaweed (Ulva lactuca L.) on N mineralization and lettuce production

“…The increase in chlorophyll content can be explained by the bioactive components found in U. lactuca extracts, such as ascorbic acid, betaine, glutathione and proline, which would actively participate in the alleviation during stress periods of plants (Ibrahim et al, 2014). A study conducted by Mansori et al (2015) showed that plants of sage (Salvia officinalis L.) under water stress conditions showed increased glycine betaine levels, but these decreased significantly when extracts of Ulva rigida C. Agardh at 50% were applied. Glycine betaine is abundant mainly in chloroplasts where it participates in the adjustment and protection of the thylakoid membrane, and also helps stabilize the quaternary structures of complex proteins in the photosystem II, thereby maintaining photosynthetic efficiency (Genard et al, 1991;Papageorgiou and Murata, 1995).…”

Ulva lactuca, A Source of Troubles and Potential Riches

“…Acidic Ulva extracts were used to replace synthetic antioxidants and to protect different cosmetic products from oxidation [39]. Ulva aqueous extracts were used for the synthesis of gold and silver nanoparticles, with excellent biocompatibility on healthy cells and were highly cytotoxic against colorectal cancer cell lines HT-29 and Caco-2 [40]. A new food-grade protein extraction protocol was proposed from Ulva and showed high digestibility in simulated gastro-intestinal tests with a high antioxidant activity [27].…”

“…Water extraction of sulphated ulvan gives a product with a high antimicrobial activity against Enterobacter cloace and Escherichia coli [63]. A simple acidic method for extraction of Ulvan, with relatively low content of protein and high sulphate, is frequently used [30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64]. The properties and bioactivities of polysaccharides can be modulated by the extraction conditions; where rhamnose, glucuronic acid and glucose are the major monosaccharides obtained at 90 °C with 0.01 M HCl.…”