ArticlebioRxiv : the preprint server for biology2026
Coordinated Evolutionary Rates in Oxidative Phosphorylation Complexes of Papilionoid Legumes: Cytonuclear Coevolution and Relaxed Selection.
Article in bioRxiv : the preprint server for biology, 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
Across eukaryotes, mitochondrial (mt) and nuclear genomes coordinate the expression and interaction of gene products to maintain cellular functions. While mitonuclear coevolution has been widely explored in animals, it remains understudied in plants, despite their utility as model systems due to relatively slow mitochondrial evolutionary rates and the presence of plastids. Plants rely on oxidative phosphorylation (OXPHOS) for ATP conversion, which requires cofunctionality and likely coevolution of mitochondrial and nuclear gene products. Here, we investigated evolutionary rate covariation (ERC) between mitochondrial- and nuclear-encoded OXPHOS genes in papilionoid legumes, where plastid-nuclear coevolution and an inversion in plastid DNA have been documented previously. Using 50 legume species spanning 15 papilionoid clades, we estimated evolutionary rates for five gene sets: mt-encoded OXPHOS genes, nuclear-encoded mitochondrial-targeted (N-mt) OXPHOS genes, and three control nuclear gene sets that lack mitochondrial interactions (glycolysis, cell cycle, and cytosolic ribosomal genes). Both mt and N-mt OXPHOS genes exhibited significantly elevated nonsynonymous (
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