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

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8];  [9]; ORCiD logo [4]
  1. Rice Univ., Houston, TX (United States). Graduate Program in Systems, Synthetic, and Physical Biology; DOE/OSTI
  2. Cornell Univ., Ithaca, NY (United States). Soil and Crop Sciences, School of Integrated Plant Science
  3. Rice Univ., Houston, TX (United States). Dept. of Bioengineering
  4. Cornell Univ., Ithaca, NY (United States). Soil and Crop Sciences, School of Integrated Plant Science; Cornell Univ., Ithaca, NY (United States). Atkinson Center for a Sustainable Future
  5. Cornell Univ., Ithaca, NY (United States). Dept. of Ecology and Evolutionary Biology
  6. Cornell Univ., Ithaca, NY (United States). Dept. of Chemistry
  7. Baylor College of Medicine, Houston, TX (United States). Center for Drug Discovery
  8. Cornell Univ., Ithaca, NY (United States). Dept. of Chemistry; Rice Univ., Houston, TX (United States). Dept. of Earth, Environmental and Planetary Sciences; Rice Univ., Houston, TX (United States). Dept. of BioSciences
  9. Rice Univ., Houston, TX (United States). Dept. of Bioengineering; Rice Univ., Houston, TX (United States). Dept. of BioSciences; Rice Univ., Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering

Plant-microbe interactions are mediated by signaling compounds that control vital plant functions, such as nodulation, defense, and allelopathy. While interruption of signaling is typically attributed to biological processes, potential abiotic controls remain less studied. Here, we show that higher organic carbon (OC) contents in soils repress flavonoid signals by up to 70%. Furthermore, the magnitude of repression is differentially dependent on the chemical structure of the signaling molecule, the availability of metal ions, and the source of the plant-derived OC. Up to 63% of the signaling repression occurs between dissolved OC and flavonoids rather than through flavonoid sorption to particulate OC. In plant experiments, OC interrupts the signaling between a legume and a nitrogen-fixing microbial symbiont, resulting in a 75% decrease in nodule formation. Our results suggest that soil OC decreases the lifetime of flavonoids underlying plant-microbe interactions.

Research Organization:
Cornell Univ., Ithaca, NY (United States); Cornell University, Ithaca, NY (United States)
Sponsoring Organization:
NSF; Robert A. Welch Foundation; USDA; USDOE Office of Science (SC)
Grant/Contract Number:
SC0016364
OSTI ID:
1626031
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 5 Vol. 6; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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