Crabgrass ( Digitaria sanguinalis ) Allelochemicals That Interfere with Crop Growth and the Soil Microbial Community.

TitleCrabgrass ( Digitaria sanguinalis ) Allelochemicals That Interfere with Crop Growth and the Soil Microbial Community.
Publication TypeJournal Article
Year of Publication2013
AuthorsZhou B, Kong C-H, Li Y-H, Wang P, Xu X-H
JournalJournal of agricultural and food chemistry
Volume61
Issue22
Pagination5310-7
Date Published2013 Jun 5
Abstract

Three chemicals, veratric acid, maltol, and (-)-loliolide, were isolated from crabgrass and their structures were identified by spectroscopic analysis. The chemicals were detected in crabgrass root exudates and rhizosphere soils, and their concentrations ranged from 0.16 to 8.10 μg/g. At an approximate concentration determined in crabgrass root exudates, all chemicals significantly inhibited the growth of wheat, maize, and soybean and reduced soil microbial biomass carbon. Phospholipid fatty acid profiling showed that veratric acid, maltol, and (-)-loliolide affected the signature lipid biomarkers of soil bacteria, actinobacteria, and fungi, resulting in changes in soil microbial community structures. There were significant relationships between crop growth and soil microbes under the chemicals' application. Chemical-specific changes in the soil microbial community generated negative feedback on crop growth. The results suggest that veratric acid, maltol, and (-)-loliolide released from crabgrass may act as allelochemicals interfering with crop growth and the soil microbial community.

DOI10.2147/IJN.S46357
Alternate JournalJ. Agric. Food Chem.