Gain-of-function CCaMK in rice overrides genetic and anatomical barriers to arbuscular mycorrhizal colonisation
Ferreras-Garrucho, G.; Hull, R.; Rubens, D.; Bates, R.; Hope, M. S.; Bowden, S.; Wallington, E.; Paszkowski, U.
Mycorrhizal Networks
Almost every vegetable, fruit tree, and wildflower in your garden relies on invisible fungal threads woven through its roots to pull phosphorus from soil — and this research reveals the molecular 'on switch' that lets plants decide how deep that partnership goes.
Most land plants form partnerships with underground fungi that help them absorb nutrients, especially phosphorus. Researchers found that flipping a single molecular switch (a protein called CCaMK) in rice roots was enough to let these fungi colonize parts of the root that are normally off-limits, like the growing tip. They also learned that a second signal — separate from that switch — is needed to help the fungi mature properly once inside the root, suggesting the partnership is controlled by at least two independent checkpoints.
Key Findings
An always-on version of the CCaMK protein restored full fungal colonization in rice mutants that normally block the symbiosis, confirming CCaMK acts downstream of the D14L signaling pathway.
Activating CCaMK allowed fungi to invade normally restricted root zones (the meristematic zone and endodermis), showing CCaMK determines which root tissues are open to fungal entry.
Even with colonization restored, arbuscules (the nutrient-exchange structures) were less developed and showed abnormal fungal septation, revealing a CCaMK-independent role for D14L in arbuscule maturation.
chevron_right Technical Summary
Scientists discovered that a single plant protein called CCaMK acts as a master switch controlling whether beneficial soil fungi can colonize rice roots, even overriding the plant's normal anatomical barriers. This helps explain how plants regulate their underground fungal partnerships and could eventually lead to crops that form stronger, more efficient symbioses without added fertilizer.
Abstract Preview
Arbuscular mycorrhizal (AM) symbiosis is conserved across land plants and is the default nutrient uptake strategy in nature. Within roots, AM colonisation is tightly patterned and dynamically tuned...
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