Whole-genome sequence of Rahnella aceris HPDA25 isolated from mycorrhizosphere of Gastrodia elata.
Zou W, Liu K, Li X, Cheng S, Han P
Mycorrhizal Networks
Gastrodia elata — a rootless, leafless orchid prized in traditional medicine — survives entirely by partnering with a specific fungus, and this newly mapped bacterium is the hidden third player that keeps that partnership thriving.
Gastrodia elata is a fascinating orchid that can't photosynthesize — it survives by feeding off a mushroom-forming fungus called Armillaria. Scientists discovered a bacterium living in the orchid's soil that helps that fungus grow, making the whole underground partnership stronger. By reading this bacterium's complete genetic blueprint, researchers now have a roadmap for understanding how to grow this medicinal plant more reliably.
Key Findings
The genome of Rahnella aceris HPDA25 was fully assembled into a 5.63 Mb sequence with one chromosome and two plasmids, with 100% completeness by CheckM analysis.
The bacterium promotes growth of Armillaria gallica, the orchid mycorrhizal fungus that Gastrodia elata depends on for survival and accumulation of its medicinal compounds.
Genome annotation revealed genes linked to antibiotic resistance, virulence factors, CRISPR loci, genomic islands, and prophages — suggesting a complex ecological role in the mycorrhizosphere.
chevron_right Technical Summary
Scientists sequenced the complete genome of a beneficial bacterium called Rahnella aceris HPDA25, found living in the root zone of Gastrodia elata (a medicinal orchid). This bacterium helps the orchid grow by boosting its fungal partner, opening new possibilities for cultivating this rare medicinal plant.
Abstract Preview
The growth, development, and accumulation of active compounds in Gastrodia elata are influenced by its mycorrhizosphere bacteria, which indirectly enhances host nutrition by stimulating the growth ...
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Gastrodia elata is a mycoheterotrophic perennial herb in the family Orchidaceae. It is found in Nepal, Bhutan, India, Japan, Korea, Siberia, Taiwan, and China.