AVP1-mediated pyrophosphate homeostasis coordinates calcium-dependent cellulose synthesis and autoimmunity during leaf growth.
Fu C, Feng Z, Teng X, Shikanai Y, Hashimoto S
Plant Signaling
PubMedIt points toward a way to engineer food crops — like tomatoes — that stay productive even when growing in calcium-poor soils, which could help farmers maintain yields on depleted land without expensive fertilizer inputs.
Plants need calcium to stay healthy, but until now no one fully understood why. It turns out that when calcium runs low, a molecular waste product builds up inside plant cells, preventing them from making the tough cell-wall material they need to grow. The damaged cell walls accidentally trip the plant's immune system, causing it to attack itself and stop producing new leaves — but scientists found that by boosting the protein that clears this waste, plants could grow normally even without much calcium.
Key Findings
Calcium deficiency reduces the abundance of the AVP1 enzyme, causing inorganic pyrophosphate to accumulate in the cytosol and disrupt cellulose synthesis in plant cell walls.
Impaired cell walls trigger salicylic acid-driven autoimmune signaling — the plant's own immune system — which actively suppresses new leaf growth.
Genetically enhancing pyrophosphate breakdown improved low-calcium growth tolerance, and this entire mechanism was also confirmed to operate in tomato, not just the model plant.
chevron_right Technical Summary
Scientists discovered that calcium-starved plants trigger their own immune systems to attack themselves, stunting leaf growth. The culprit is a molecular traffic jam: without enough calcium, a key enzyme fails, a waste molecule piles up, cell walls weaken, and the plant misfires an immune alarm — but fixing the enzyme restores normal growth.
Abstract Preview
Calcium (Ca) availability is vital for optimal plant growth and immune signaling, yet the underlying mechanisms remain elusive. Here, we reveal that Arabidopsis vacuolar H⁺-pyrophosphatase (AVP1)-r...
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