ArticleScience advances2026
ER-mitochondria tether ML1 coordinates peripheral fission and wholesale mitophagy for plant adaptation to carbon starvation.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Plants frequently encounter carbon starvation from extended darkness or canopy shading or in nonphotosynthetic tissues, requiring rapid mitochondrial remodeling to match reduced metabolic flux. Here, we reveal a coordinated program integrating peripheral fission-mediated damage segregation and wholesale mitophagy. Carbon starvation triggers a shift from symmetric midzone fission to asymmetric peripheral fission, generating small depolarized fragments alongside larger polarized mitochondria. Unexpectedly, damage-independent wholesale mitophagy targets medium-sized mitochondria for both burden reduction and resource mobilization while excluding small peripheral fission products. We identify mitochondria-ER (endoplasmic reticulum) linker 1 (ML1), a carbon starvation-inducible ER-mitochondria tether, as the central coordinator. At ER-mitochondria contact sites, ML1 promotes peripheral fission and recruits ATG18a (autophagy-related protein 18a) for wholesale mitophagy. Loss of ML1 impairs this coordinated remodeling, resulting in elongated mitochondria, compromised function, and hypersensitivity to carbon starvation. These findings reveal how plants achieve rapid metabolic adaptation through coordinated mitochondrial remodeling.
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