期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 20, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/ijms20020431
关键词
GC-MS; LC-MS; metabolomics; root exudate; rhizosphere; sorghum
资金
- National Institute of Food and Agriculture, U.S. Department of Agriculture [2016-67011-25103]
- Colorado State University Agricultural Experiment Station
- Energy Institute at Colorado State University
- Sustainable Bioenergy Development Center at Colorado State University
Root exudation is an important plant process by which roots release small molecules into the rhizosphere that serve in overall plant functioning. Yet, there is a major gap in our knowledge in translating plant root exudation in artificial systems (i.e., hydroponics, sterile media) to crops, specifically for soils expected in field conditions. Sorghum (Sorghum bicolor L. Moench) root exudation was determined using both ultra-performance liquid chromatography and gas chromatography mass spectrometry-based non-targeted metabolomics to evaluate variation in exudate composition of two sorghum genotypes among three substrates (sand, clay, and soil). Above and belowground plant traits were measured to determine the interaction between sorghum genotype and belowground substrate. Plant growth and quantitative exudate composition were found to vary largely by substrate. Two types of changes to rhizosphere metabolites were observed: rhizosphere-enhanced metabolites (REMs) and rhizosphere-abated metabolites (RAMs). More REMs and RAMs were detected in sand and clay substrates compared to the soil substrate. This study demonstrates that belowground substrate influences the root exudate profile in sorghum, and that two sorghum genotypes exuded metabolites at different magnitudes. However, metabolite identification remains a major bottleneck in non-targeted metabolite profiling of the rhizosphere.
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