Response network and regulatory measures of plant-soil-rhizosphere environment to drought stress

Liao, Zhenqi; Fan, Junliang; Lai, Zhenlin; Bai, Zhentao; Wang, Haidong; Cheng, Minghui; Zhang, Fucang; Li, Zhijun

doi:10.1016/bs.agron.2023.03.002

Cited by 10 publications

(1 citation statement)

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“…Therefore, closed systems dominate the hydroponic landscape. During the hydroponic process, plants release inorganic ions and organic compounds through root exudates, influencing the productivity of the hydroponic system (Guyonnet et al, 2017;Lei et al, 2023;Liao et al, 2023). Organic acids are one of the components in root exudates, and their attention is widespread due to their role as an organic carbon source.…”

Section: Introductionmentioning

confidence: 99%

The impact of benzoic acid and lactic acid on the treatment efficiency and microbial community in the sulfur autotrophic denitrification process

Du,

Xu,

et al. 2024

Water Environment Research

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Nitrate poses a potential threat to aquatic ecosystems. This study focuses on the sulfur autotrophic denitrification mechanism in the process of water culture wastewater treatment, which has been successfully applied to the degradation of nitrogen in water culture farm effluents. However, the coexistence of organic acids in the treatment process is a common environmental challenge, significantly affecting the activity of denitrifying bacteria. This paper aims to explore the effects of adding benzoic acid and lactic acid on denitrification performance, organic acid removal rate, and microbial population abundance in sulfur autotrophic denitrification systems under optimal operating conditions, sulfur deficiency, and high hydraulic load. In experiments with 50 mg·L−1 of benzoic acid or lactic acid alone, the results show that benzoic acid and lactic acid have a stimulating effect on denitrification activity, with the stimulating effect significantly greater than the inhibitory effect. Under optimal operating conditions, the average denitrification rate of the system remained above 99%; under S/N = 1.5 conditions, the average denitrification rate increased from 88.34% to 91.93% and 85.91%; under HRT = 6 h conditions, the average denitrification rate increased from 75.25% to 97.79% and 96.58%. In addition, the addition of organic acids led to a decrease in microbial population abundance. At the phylum level, Proteobacteria has always been the dominant bacterial genus, and its relative abundance significantly increased after the addition of benzoic acid, from 40.2% to 61.5% and 62.4%. At the genus level, Thiobacillus, Sulfurimonas, Chryseobacterium, and Thermomonas maintained high population abundances under different conditions.Practitioner Points Employing autotrophic denitrification process for treating high‐nitrate wastewater. Utilizing organic acids as external carbon sources. Denitrifying bacteria demonstrate high utilization efficiency towards organic acids. Organic acids promote denitrification more than they inhibit it. The promotion is manifested in the enhancement of activity and microbial abundance.

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Section: Introductionmentioning

confidence: 99%