Soil organic matter attenuates the efficacy of flavonoid-based plant-microbe communication

Valle, Ilenne Del; Webster, Tara M.; Cheng, Hsiao-Ying; Thies, Janice E.; Kessler, André; Miller, Mary K.; Ball, Zachary T.; MacKenzie, Kevin R.; Masiello, Caroline A.; Silberg, Jonathan J.; Lehmann, Johannes

doi:10.1126/sciadv.aax8254

Cited by 64 publications

(48 citation statements)

References 50 publications

(79 reference statements)

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“…Rhizosphere flavonoids and phenols, both in the root and soil, showed positive correlation with nodule formation. The release of flavonoid into the soil has been shown to be affected by external soil nutrient input as shown for dissolved organic carbon ( Del Valle et al., 2020 ) and phosphorus ( Juszczuk et al., 2004 ) in related previous studies. In the present study, biochar for instance optimized pH, increased available phosphorus, soil organic carbon, which could have stimulated the release of these metabolites.…”

Section: Discussionmentioning

confidence: 73%

Application of biochar and inorganic phosphorus fertilizer influenced rhizosphere soil characteristics, nodule formation and phytoconstituents of cowpea grown on tropical soil

Phares

Atiah

Frimpong

et al. 2020

Heliyon

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The effect of biochar alone or co-applied with triple superphosphate on rhizosphere soil characteristics, nodule formation, phytoconstituents and antioxidant property of cowpea ( Vigna uguiculata ) is yet to be adequately examined in sub Saharan Africa. A field experiment was conducted where cowpea ( Vigna unguiculata ) was grown in a tropical sandy loam soil amended with biochar at 1.5 t ha −1 and 2.5 t ha −1 solely or together with inorganic phosphate fertilizer (Triple superphosphate), applied at a rate of 60 kg P ha −1 . At 50% flowering, changes in selected rhizosphere soil properties (pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity), nodule count, phytochemicals (phenols, flavonoids, alkaloids, tannins, saponins) and antioxidant property of cowpea roots and leaves were determined by standard laboratory procedures. Differences between means of the measured parameters were established using ANOVA, and relationships among the parameters were explored using Pearson correlation (p < 0.05). Addition of biochar solely or in combination with TSP significantly (p < 0.05) increased soil pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity and root nodule count. Flavonoids, phenols, alkaloids, saponin, tannin contents and antioxidant activity in the roots and leaves were significantly (p < 0.05) higher in the amended soils compared with the unamended soil. Similarly, soil flavonoids, phenols, alkaloids and antioxidant activity were significantly higher in amended soils compared with control. Significant, positive inter and intra correlation with varying strength was found between soil properties, nodule number and phytoconstituents. This is an indication that biochar can be co-applied with triple superphosphate to sustain soil fertility, improve nodulation and enhance concentrations of phytoconstituents in soil, cowpea roots and leaves.

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Section: Discussionmentioning

confidence: 73%

Application of biochar and inorganic phosphorus fertilizer influenced rhizosphere soil characteristics, nodule formation and phytoconstituents of cowpea grown on tropical soil

Phares

Atiah

Frimpong

et al. 2020

Heliyon

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“…Newly tractable questions include identifying soil controls on (1) the growth of nitrogen-fixing symbionts, and (2) AHL-mediated communication controlling the exchange of symbiotic plasmids encoding nitrogen-fixing machinery. Beyond processes mediated by AHL signaling, it is now possible to explore: (3) flavonoid-mediated plant-to-microbe communication required for initiating symbiosis (Del Valle et al, 2020 ), as well as (4) nod factor mediated microbe-to-plant communication critical to nodule formation (Wang et al, 2018 ). In the future, detailed insight into different signaling processes will be crucial to understanding how land use practices can maximize biological fixation of nitrogen and minimize fertilizer application.…”

Section: A Biosensors Can Address Hard Environmental Challengesmentioning

confidence: 99%

Translating New Synthetic Biology Advances for Biosensing Into the Earth and Environmental Sciences

et al. 2021

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The rapid diversification of synthetic biology tools holds promise in making some classically hard-to-solve environmental problems tractable. Here we review longstanding problems in the Earth and environmental sciences that could be addressed using engineered microbes as micron-scale sensors (biosensors). Biosensors can offer new perspectives on open questions, including understanding microbial behaviors in heterogeneous matrices like soils, sediments, and wastewater systems, tracking cryptic element cycling in the Earth system, and establishing the dynamics of microbe-microbe, microbe-plant, and microbe-material interactions. Before these new tools can reach their potential, however, a suite of biological parts and microbial chassis appropriate for environmental conditions must be developed by the synthetic biology community. This includes diversifying sensing modules to obtain information relevant to environmental questions, creating output signals that allow dynamic reporting from hard-to-image environmental materials, and tuning these sensors so that they reliably function long enough to be useful for environmental studies. Finally, ethical questions related to the use of synthetic biosensors in environmental applications are discussed.

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“…Flavonoids are also essential for chemical signaling with mycorrhizal fungi and rhizobacteria [ 126 , 127 ]. They act as chemoattractants and can directly stimulate bacterial gene expression [ 126 , 128 ].…”

Section: Plant–bacteria Interactions In Rhizosphere and Defense From Heavy Metal Stressmentioning

confidence: 99%

Rhizosphere Microbial Communities and Heavy Metals

Caracciolo

Terenzi

2021

Microorganisms

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The rhizosphere is a microhabitat where there is an intense chemical dialogue between plants and microorganisms. The two coexist and develop synergistic actions, which can promote plants’ functions and productivity, but also their capacity to respond to stress conditions, including heavy metal (HM) contamination. If HMs are present in soils used for agriculture, there is a risk of metal uptake by edible plants with subsequent bioaccumulation in humans and animals and detrimental consequences for their health. Plant productivity can also be negatively affected. Many bacteria have defensive mechanisms for resisting heavy metals and, through various complex processes, can improve plant response to HM stress. Bacteria-plant synergic interactions in the rhizosphere, as a homeostatic ecosystem response to HM disturbance, are common in soil. However, this is hard to achieve in agroecosystems managed with traditional practices, because concentrating on maximizing crop yield does not make it possible to establish rhizosphere interactions. Improving knowledge of the complex interactions mediated by plant exudates and secondary metabolites can lead to nature-based solutions for plant health in HM contaminated soils. This paper reports the main ecotoxicological effects of HMs and the various compounds (including several secondary metabolites) produced by plant-microorganism holobionts for removing, immobilizing and containing toxic elements.

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Soil organic matter attenuates the efficacy of flavonoid-based plant-microbe communication

Cited by 64 publications

References 50 publications

Application of biochar and inorganic phosphorus fertilizer influenced rhizosphere soil characteristics, nodule formation and phytoconstituents of cowpea grown on tropical soil

Application of biochar and inorganic phosphorus fertilizer influenced rhizosphere soil characteristics, nodule formation and phytoconstituents of cowpea grown on tropical soil

Translating New Synthetic Biology Advances for Biosensing Into the Earth and Environmental Sciences

Rhizosphere Microbial Communities and Heavy Metals

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