Abstract
Cover cropping has emerged as a sustainable alternative to traditional crop rotational practices, yet the effects of variable root exudation from cover crop species and cultivars within species remains unclear. Here, we assess the chemical heterogeneity of root exudates from 16 commonly used cover crop species as well as 3 distinct cultivars of hairy vetch. Plants were grown hydroponically and analyzed via nontargeted gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS), and targeted LC-MS/MS to evaluate patterns in root exudate composition across species and functional plant type. Overall, root exudation profiles are heterogeneous across crop species and cultivars. Species within legumes stand out as a unique functional group of plants capable of producing distinct chemical environments rich with complex secondary metabolites, such as triterpenoid saponins (soyasaponins), isoflavonoids, and flavonoids.
Published Version
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