Ulva lactuca Extract and Fractions as Seed Priming Agents Mitigate Salinity Stress in Tomato Seedlings

Abstract

The present study investigates the effect of Ulva lactuca extract as seed-priming agent for tomato plants under optimal and salinity stress conditions. The aims of this experiment were to assess the effect of seed priming using Ulva lactuca extract in alleviating the salinity stress tomato plants were subjected to, and to find out the possible mechanism of actions behind such a positive effect via means of fractionation of the crude extract and characterization. Salinity application decreased the plant biomass and altered different physiological traits of tomato. However, the application of Ulva lactuca methanol extract (ME) and its fractions (residual fraction (RF), chloroform fraction (CF), butanol fraction (BF), and hexane fraction (HF)) at 1 mg·mL−1 as seed priming substances attenuated the negative effects of salinity on tomato seedlings. Under salinity stress conditions, RF application increased the tomato fresh weight; while ME, RF, and HF treatments significantly decreased the hydrogen peroxide (H2O2) concentration and antioxidant activity in tomato plants. The biochemical analyses of Ulva lactuca extract and fractions showed that the RF recorded the highest concentration of glycine betaine, while the ME was the part with the highest concentrations of total phenols and soluble sugars. This suggests that these compounds might play a key role in the mechanism by which seaweed extracts mitigate salinity stress on plants.

Nanoplatforms for Irinotecan Delivery Based on Mesoporous Silica Modified with a Natural Polysaccharide

“…The methanolic extract had a higher content of polyphenols than that reported by El-Baky et al [ 41 ] for dichloromethane-methanol extract (21.3–34.1 mgCHt/g extract). However, the TPC value of the methanolic fraction is significantly lower than the values reported by El-Boukary et al (54.1–112.6 mg GAE/g extract) [ 42 ]. One can observe that in methanol, the more polar solvent chlorophyll-b was better extracted than chlorophyll-a.…”

Azolla filiculoides extract improved salt tolerance in wheat (Triticum aestivum L.) is associated with prompting osmostasis, antioxidant potential and stress-interrelated genes

“…Natural extracts derived from plants, algae, and microorganisms have demonstrated the ability to enhance plant growth and yield under stress conditions, while mitigating the drawbacks associated with synthetic substances. Noteworthy examples include the use of Arthrocnemum macrostachyum to reduce salt effects in soybean 9 , sorghum water extract for camelina 10 , moringa leaf extract for common bean 11 , and Ulva lactuca extract for tomato 12 . These extracts exhibit beneficial properties linked to their ability to reduce stress-related oxidative damage, regulate antioxidant activities, accumulate non-enzymatic antioxidants, maintain nutritional homeostasis, prevent ion leakage, promote membrane consistency and fluidity, and stimulate the accumulation of osmoprotectants like proline, glycinebetaine, sugars, and amino acids 13 – 15 .…”

Strategies and prospects for biostimulants to alleviate abiotic stress in plants

“…In Europe, biostimulants have been used in many types of plants and crops, such as vegetable crops (e.g., Allium cepa, Capsicum annuum, Brassica oleracea, Solanum tuberosum, Cucumis sativus, Allium sativum, Solanum lycopersicum , Cucurbita pepo , Daucus carota , L. sativa, and Solanum melongena ), fruit crops (e.g., Olea europaea , Prunus sp., Fragaria ananassa , Cucumis melo , Citrullus lanatus , Vitis vinifera , Citrus sinensis and Pyrus communis ), grain crops (e.g., Hordeum vulgare , Triticum aestivum , Oryza sativa , and Zea mays ), oil crops (e.g., Brassica napus and Glycine max ), horticultural crops (e.g., flowers, nurseries, lawns), and ornamental plants. Biostimulants have been widely used at all stages of production of the above-mentioned crops under various climatic stresses including as seed treatments, as foliar sprays during growth, as well as on harvested products ( Khan et al., 2020 ; El Boukhari et al., 2021 ; Sorrentino et al, 2021 ; Jacomassi et al., 2022 ).…”