A leaf yeast shares vitamins to keep a pathogen alive
Hu Y, Bode J, Gómez-Pérez D, Guerreiro MA, Mari A
Plant Signaling
Every leaf in your yard hosts an invisible economy of microbes trading nutrients to survive, and understanding those trades could one day help gardeners and farmers build healthier, more disease-resilient plants without reaching for chemicals.
Leaves aren't just plant tissue, they're covered in tiny organisms living together in complex communities. Researchers found that a yeast called Dioszegia hungarica makes vitamin B1 and hands it over to a mold-like microbe, Albugo laibachii, which can't produce that vitamin on its own. In exchange, having the mold around seems to help the yeast stick around longer on the leaf, showing that these two microbes have evolved a kind of nutritional handshake that keeps them both in business.
Key Findings
Dioszegia hungarica yeast supplies thiamine (vitamin B1) to Albugo laibachii via a dedicated membrane permease, compensating for the oomycete's thiamine auxotrophy
Genomic and transcriptomic evidence shows natural selection has shaped thiamine production specifically in Dioszegia, pointing to coevolved metabolic complementation
Continental-scale microbiome surveys identified these two eukaryotic microbes as 'hub' species whose asymmetric mutualism supports leaf microbiome stability, and glasshouse assays show Albugo's presence helps Dioszegia persist
chevron_right Technical Summary
Scientists discovered that a common leaf yeast feeds vitamin B1 to a plant pathogen that can't make its own, and in return the pathogen helps the yeast survive on the leaf. This tiny trade explains how two very different microbes manage to coexist on plant leaves everywhere.
Abstract Preview
Original paper
Thiamine cross-feeding drives microbial coexistence in the leaf microbiome.
Microbiome homeostasis is crucial for host health and ecosystem function, yet the molecular and ecological mechanisms underlying community assembly and stability remain elusive. Here we uncover a c...
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