期刊
SCIENCE ADVANCES
卷 6, 期 5, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aax8254
关键词
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资金
- W. M. Keck Foundation
- Rice University
- Taiwan Ministry of Education Scholarship
- NSF-BREAD [IOS-0965336, OPP51589]
- Department of Energy (Office of Science) [DE-SC0016364]
- USDA NIFA Carbon Cycles [2014-67003-22069]
- Robert A. Welch Foundation [C-1680]
- NSF [CHE-1609654, CHE-1904865]
- U.S. Department of Energy (DOE) [DE-SC0016364] Funding Source: U.S. Department of Energy (DOE)
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.
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