Composite poplars: a novel tool for ectomycorrhizal research.

Plant Cell Rep · 2017 · PMC5668338 · PMID 29063187

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In contrast, plants inoculated with the cucumopine strain K599 revealed a slight (6.37 ± 2.85) but highly significant increase in root number, while those inoculated with 15834 revealed many more (18.06 ± 7.74) roots per plant.

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