Beyond elongation: The multifaceted roles of gibberellins in symbiosis and root development.
Velandia K, Drapek C, Foo E, Jones AM
Summary
PubMedWhy it matters This matters because understanding how plants naturally recruit helpful soil microbes could lead to crops that need less fertilizer, making your food cheaper to grow and reducing the chemical runoff that pollutes waterways near farms and gardens.
Plants have a hormone called gibberellin that most people know makes stems grow tall, but it turns out it also acts like a conductor directing how roots team up with helpful underground fungi and bacteria. These partnerships are crucial — the fungi help plants absorb nutrients and the bacteria can pull nitrogen straight from the air, acting like a natural fertilizer. The twist is that gibberellin plays opposite roles at different stages: it slows down the initial 'handshake' between plant and microbe, but then actively helps build and run the nodules where bacteria live and do their work.
chevron_right Technical Details
A review reveals that the plant hormone gibberellin plays a surprisingly complex, context-dependent role in how plant roots form partnerships with beneficial soil fungi and bacteria — not just in making plants taller.
Key Findings
Gibberellin suppresses early symbiotic signaling by breaking down DELLA proteins, which are required to initiate partnerships with both mycorrhizal fungi and nitrogen-fixing bacteria.
Despite inhibiting early infection, gibberellin positively regulates the later formation and function of root nodules — demonstrating a stage-dependent, dual role within the same biological process.
DELLA proteins act as a central hub in the 'common symbiotic signaling pathway,' meaning a single molecular switch influences a plant's ability to form both fungal and bacterial partnerships simultaneously.
Abstract Preview
Plants regulate root development in response to fluctuating environmental conditions, including establishing symbiotic relationships with arbuscular mycorrhizal fungi and nitrogen-fixing bacteria u...
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