Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization, Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, College of Resources and Environment, Anhui Agricultural University, Hefei, 230036, P. R. China.
Bijie Academy of Agricultural Sciences, Bijie, 551700, China.
BMC Plant Biol. 2024 Jul 25;24(1):703. doi: 10.1186/s12870-024-05435-4.
Fulvic acid enhances plant growth and interacts synergistically with phosphate fertilizer to alleviate the agricultural production problem of low phosphorus fertilizer utilization efficiency. However, the underlying mechanism of its action remains poorly understood. In this study, we investigated the impact of fulvic acid application with varying concentrations (0, 40, 60, 80 and 120 mg/L) on rice performance in plants grown in a hydroponic system subjected to low phosphorus stress. The rice growth phenotypes, biomass, root morphology, phosphorus uptake, and the impact of fulvic acid on the rhizosphere environment of rice, were assessed.
The findings showed that adding appropriate concentrations of exogenous fulvic acid could promote the growth performance of rice under low phosphorus stress. Particularly at T1 (40 mg/L) and T2 (60 mg/L) over the control effectively increased rice biomass by 25.42% and 24.56%, respectively. Fulvic acid treatments stimulated root morphogenesis, up-regulated phosphate transporter genes, and facilitated phosphorus absorption and accumulation. Especially T1 (20.52%), T2 (18.10%) and T3 (20.48%) treatments significantly increased phosphorus uptake in rice, thereby alleviating low phosphorus stress. Additionally, fulvic acid elevated organic acids concentration in roots and up-regulated plasma membrane H-ATPase genes, promoting organic acids secretion. This metabolic alteration can also alleviate low phosphorus stress in rice.
The effect of exogenous fulvic acid on physiological indicators is concentration-dependent under low phosphorus stress, enhances rice performance and reduces reliance on phosphorus fertilizer. This provides new insights to shed light on the mechanism of alleviating low phosphorus stress in rice through fulvic acid application, an eco-friendly tool.
腐植酸能促进植物生长，并与磷肥协同作用，缓解磷肥利用效率低的农业生产问题。然而，其作用机制尚不清楚。本研究在水培系统中研究了不同浓度（0、40、60、80 和 120mg/L）的腐植酸对低磷胁迫下水稻生长的影响。评估了水稻生长表型、生物量、根系形态、磷吸收以及腐植酸对水稻根际环境的影响。
结果表明，添加适量的外源腐植酸可以促进低磷胁迫下水稻的生长性能。特别是在 T1（40mg/L）和 T2（60mg/L）处理下，与对照相比，水稻生物量分别有效增加了 25.42%和 24.56%。腐植酸处理刺激根形态发生，上调磷转运体基因，促进磷吸收和积累。特别是 T1（20.52%）、T2（18.10%）和 T3（20.48%）处理显著增加了水稻对磷的吸收，从而缓解了低磷胁迫。此外，腐植酸提高了根系中有机酸的浓度并上调了质膜 H-ATPase 基因，促进了有机酸的分泌。这种代谢改变也可以缓解水稻的低磷胁迫。
在低磷胁迫下，外源腐植酸对生理指标的影响具有浓度依赖性，能增强水稻的性能，减少对磷肥的依赖。这为利用腐植酸缓解水稻低磷胁迫提供了新的见解，腐植酸是一种环保工具。
