Physiological and Flavonoid Metabolic Responses of Black Locust Leaves to Drought Stress in the Loess Plateau of China

Forests, Journal Year: 2025, Volume and Issue: 16(4), P. 695 - 695

Published: April 17, 2025

Drought threatens the stability of artificial black locust forests on Loess Plateau, yet there is limited research physiological and metabolic responses mature to drought stress. This study employed a throughfall exclusion system—i.e., moderate (40% reduction), extreme (80% 0% reduction for control—to analyze leaf microstructure, relative water content (RWC), osmotic adjustment substances, hormone levels, flavonoid metabolites in under controlled The results demonstrated that as stress intensified, stomatal aperture density decreased, while trichome length exhibited significant increases. MDA, proline, IAA, substances (soluble protein, reducing sugar, total sugar) first increased then decreased intensified. A 245 compounds were identified through metabolomic analysis, among which 91 differential expression treatments. Notably, 37 flavonoids, including flavonols glycosylated derivatives, consistently upregulated. These findings suggest can lead accumulation flavonoids. explored trees stress, offering insights selecting drought-resistant species vegetation restoration informing ecological management practices arid regions.

Language: Английский

Fulvic Acid Enhances Oat Growth and Grain Yield Under Drought Deficit by Regulating Ascorbate–Glutathione Cycle, Chlorophyll Synthesis, and Carbon–Assimilation Ability

Agronomy, Journal Year: 2025, Volume and Issue: 15(5), P. 1153 - 1153

Published: May 9, 2025

Drought deficit inhibits oat growth and yield. Fulvic acid (FA) can enhance plant stress tolerance, but its effects on regulating the ascorbate–glutathione cycle, chlorophyll synthesis, carbon–assimilation ability remain unclear. Therefore, this study aimed to elucidate physiological mechanisms of FA regulation drought tolerance in oats relationship with yield using drought-resistant variety Yanke 2 drought-sensitive Bayou 9. The yield, antioxidant system, capacity under were investigated by systematically assessing changes morphogenesis, intermediates, enzyme activities, carbohydrate metabolism. results showed that stress, treatment significantly promoted (leaf area, dry matter) elevated glutathione peroxidase, ascorbate reductase, dehydroascorbate reductase reduced ascorbic acid, content. In addition, increased chlorophyll, as well magnesium protoporphyrin IX, protochlorophyllin ester content, enhanced 1,5-bisphosphate ribulose carboxylase, carboxylase enzyme, 1,7-bisphosphate sestamibiose heptulose esterase, 1,6-bisphosphate fructose aldolase, sucrose synthase, phosphate invertase, neutral invertase sucrose, glucose, Overall, fulvic alleviates drought-induced damage enhancing promoting biosynthesis, improving carbon assimilation (Yanke 2) was more effective application compared (Bayou 9). This research provides valuable insight into potential a biostimulant abiotic stress.

Language: Английский