Pre-treatment of Fulvic Acid Plays a Stimulant Role in Protection of Soybean (Glycine max L.) Leaves Against Heat and Salt Stress

Abstract

The purpose of this study was to illuminate the effects of fulvic acid in plants’ stress signaling pathway. 2.0 mg/l fulvic acid was sprayed on soybean leaves for 3 days at 12 h intervals, followed by treatment of 150 mM NaCl or exposed to heat stress at 35°C for 2 h over 2 days. Pre-treatment with fulvic acid increased the relative water content (RWC), antioxidant enzyme, isoenzyme activities (SOD, APX, GST), as well as alleviated the stress-induced oxidative damage by decreasing the levels of hydrogen peroxide (H2O2) and malondialdehyde (MDA). In addition, the application of fulvic acid under salt stress induced rubisco expression only at 12 h, while it induced the expression of cytochrome c oxidase at 6 h and 12 h. On the other hand, fulvic acid under heat stress induced significant expression of both rubisco and cytochrome c oxidase at 6 h and 12 h. However, under high salinity conditions, fulvic acid suppressed the transcript levels of Hsp70, while it induced increases in Hsp70 levels under heat treatment at 6 h. As a result, in this study, fulvic acid played the role of a regulator and stimulant in stress response of soybean leaves.

Fulvic acid ameliorates drought stress-induced damage in tea plants by regulating the ascorbate metabolism and flavonoids biosynthesis

“…Many studies have shown that FA has many plant physiological activities. FA could significantly alleviate the toxic symptoms of Cd on lettuce seedlings [15].. And FA could protect soybean and barley against salt stress [16,17]. Moreover, FA played important roles in the improvement of drought resistance in plants.…”

Responses of the tree peony (Paeonia suffruticosa, Paeoniaceae) cultivar ‘Yu Hong’ to heat stress revealed by iTRAQ-based quantitative proteomics

“…Furthermore, 1 up-regulated cytochrome C oxidase (c119073.graph_c0) was discovered in this study, which is found in the electron transport system of mitochondria and generates two molecules of water by transferring electrons to O 2− . Because mitochondria, but not chloroplasts, create ROS, defects or shortages in this enzyme can be lethal to plants [ 74 , 75 ]. This finding shows that shielding mitochondria from oxidative damage produced by heat stress can aid in heat stress management.…”

Dietary fulvic acid effects on survival and expression of immune-related genes inLitopenaeus vannameichallenged withVibrio parahaemolyticus

“…There are no previous reports about the effect of FA on HSP70 gene expression in animals. However, FA administration can downregulate the mRNA HSP70 expression in plants under saline stress conditions (Dinler, Gunduzer, & Tekinay, ). We can interpret that dietary FA did not cause stress in shrimp and might contribute to the reduction in stress in shrimp under intensive culture conditions, which merits further investigation.…”