Urban farm microbes are so local they reveal which farm grew your greens
Gao M, Zeng Q, Lam K, Toro M, Micallef SA
Soil Health
The community garden plot down the street has its own invisible signature of helpful bacteria and fungi, shaped by what water you use and how acidic and moist your beds are, and that signature ends up living on the leaves you eat.
Researchers swabbed soil and leafy greens like kale and lettuce from seven urban farms and gardens near Washington, DC, and sequenced the DNA of all the microbes living there. They found that things gardeners control, like where irrigation water comes from and how healthy the soil is, strongly shape which bacteria and fungi show up, and some of those microbes even help protect plants from disease naturally. The microbial mix was so distinctive to each site that a computer program could guess which farm a sample came from just by reading its microbes.
Key Findings
Across 7 urban farms, researchers analyzed 92 leaf samples, 92 rhizosphere soil samples, and 39 bulk soil samples using 16S rRNA and ITS2 gene sequencing.
Microbial community composition differed significantly by site, driven by irrigation water source, crop type, soil pH, soil moisture, and climate (rainfall and temperature).
Machine learning models accurately predicted which production site a sample came from based on bacterial communities, and some leafy greens were enriched with Lactobacillaceae, a group linked to biocontrol against plant pathogens.
chevron_right Technical Summary
Scientists studying urban farms around Washington, DC found that the mix of bacteria and fungi on leafy greens and in soil depends heavily on local conditions like water source, soil pH, and weather, and these microbial fingerprints were distinct enough to pinpoint which farm the produce came from.
Abstract Preview
Original paper
Microbiomes of soils and leafy vegetables in urban agriculture systems reflect crop management and local environmental conditions.
Soil and plant microbiomes influence crop quality and preharvest food safety, yet these processes have been largely unexplored in urban agriculture environments. Here, we investigated how the micro...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Kale, also called leaf cabbage, belongs to a group of cabbage cultivars primarily grown for their edible leaves, but it is also used as an ornamental plant. Its multiple different cultivars vary quite a bit in appearance; the leaves can be bumpy, curly, or flat, and the color ranges from purple to green.