mb_bucherlab

@mb-bucherlab.bsky.social

Plant molecular physiologist exploring the microverse and plant nutrition; proud dad, loves badminton, drums and percussion. Views are my own. 🇩🇪🤝🇨🇭🤝🇺🇦

1/“In seconds, our home was gone.” Massive rockslide buried the village of Blatten, Switzerland. One person missing. Around 300 residents lost everything, homes, memories, livelihoods. 💔 But help is coming: 🤝 Emergency support from Caritas, Red Cross, army & local authorities

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Wow... Mycorrhizal fungal highways for plant signals and rhizobia  -> Legume-specific recruitment of rhizobia by hyphae of arbuscular mycorrhizal fungi | The ISME Journal | Oxford Academic

Legume-specific recruitment of rhizobia by hyphae of arbuscular mycorrhizal fungi

The legume-rhizobia symbiosis possesses great potential for sustainable agriculture because of its ability to fix atmospheric nitrogen, reducing crop dependence on nitrogen fertilizers. Rhizobia recognize the host legume through flavonoids released by the roots. These signals are detected by bacteria typically over a few millimeters. Recent research has shown that arbuscular mycorrhizal fungi extend this recognition beyond 15 cm by transporting flavonoids along their hyphae. In soil, common mycorrhizal networks linking plants are formed by arbuscular mycorrhizal fungi. We hypothesized that such networks linking different legumes can transmit host-specific signals, guiding rhizobia to their appropriate hosts. Using in vitro and greenhouse microcosms, we linked Medicago truncatula and Glycine max via a common mycorrhizal network of Rhizophagus irregularis and inoculated GFP-labeled Sinorhizobium meliloti and mCherry-labeled Bradyrhizobium diazoefficiens on the hyphae. S. meliloti preferentially migrated towards M. truncatula, whereas B. diazoefficiens preferentially migrated towards G. max (155 ± 8 and 13 ± 3 nodules, respectively). This was confirmed in the greenhouse with a higher concentration of S. meliloti (2.1-2.5 × 105 CFU·g−1) near M. truncatula and a higher concentration of B. diazoefficiens (1.5-1.6 × 105 CFU·g−1) near G. max (71-82 and 15-18 nodules, respectively). Metabolomics revealed host-specific flavonoids in hyphal exudates: M. truncatula-connected hyphae released DL-liquiritigenin, naringenin, sakuranetin, and 3,7-dimethylquercetin, whereas G. max-connected hyphae released daidzin, 6”-O-malonyldaidzin, irilone, and erylatissin A. These findings establish that common mycorrhizal networks constitute a “navigation system”, using chemical signals to orient rhizobia towards their specific hosts, thereby improving nodulation with potential applications in agriculture.

academic.oup.com

New preprint! We present SSC, a semi-automated method to extract fungal hyphae and their microbiota from natural soils - no glass beads, no artificial conditions. Enables hyphal density quantification & NGS of surface-attached microbes. Read more: doi.org/10.1101/2025...

Streamlining the isolation of fungal hyphae: A semi-automated approach for soil substrates

Extracting fungal hyphae with their natural associated microbiota from soil samples presents a significant challenge due to their small size, typically in the micrometer range, and the formation of dy...

doi.org

📢 Calling all PhD students, postdocs & early-career scientists! 📢 Join us at the IS-MPMI Congress 2025 in Cologne, Germany 🇩🇪 from July 13-17, 2025! 🔹 Abstract submission deadline: March 11 🔹 Submit here: www.ismpmi.org/Events/2025C...

2025 Congress

​​...​​...​2025 IS-MPMI Congress​...​​​Save the Date! Sunday, 13 July – Thursday, 17 July, 2025 Confex Conference and Exhibition Centre, Cologne, Germany​ ​ Mark your calendars for the 2025 IS-MPMI Co...

ismpmi.org

Marie-Noëlle Rosso closing the session explored how fungi break down recalcitrant plant tissues, revealing a diverse enzymatic arsenal shaped by 180 million years of evolution. Her team showed that gene family expansions/contractions drive lignocellulose degradation across fungal clades. #ECFG17

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Xin Xiang builds on Ron Morris’ pioneering work on nuclear migration in Aspergillus nidulans. Her talk at #ECFG17 highlights how microtubules and motor proteins orchestrate organelle distribution in fungal hyphae. Fascinating insights into the fungal cytoskeleton! #ECFG2025

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At #ECFG17, like at all major scientific conferences worldwide, the talks highlight how science thrives on global collaboration. Borders don’t define discovery - diversity and cooperation do. Meanwhile, U.S. policies seem to be moving in the opposite direction.

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1/The debt brake is slowing down university construction in 🇩🇪: renovation backlog, delayed new buildings and outdated infrastructure are jeopardising education and research. Without exemptions for investments, the science location 🇩🇪 loses competitiveness. #Schuldenbremse