{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T11:05:23Z","timestamp":1761649523924,"version":"build-2065373602"},"reference-count":66,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T00:00:00Z","timestamp":1758067200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["32171920"],"award-info":[{"award-number":["32171920"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Mitoviral-derived sequences are frequently detected in plant genomes, encoding an RNA-dependent RNA polymerase (RdRp). These sequences share many similarities with mitoviruses that are known to commonly infect plant mitochondria. However, the functional characterization of nuclear-encoded mitoviral-RdRp remains unclear. This study elucidates the critical role of mRdRp (AT2G07749) in maintaining mitochondrial homeostasis and embryo viability, highlighting the dual role of viral-derived genes in plant development and stress response. Phylogenetic analysis reveals that mRdRp shares 96.8% identity with the mitoviral RdRp encoded by mitochondrial-genomes, suggesting that this nuclear mRdRp gene originated from horizontal transfer events following ancestral plant-mitovirus infections. To dissect mRdRp function, we generated a mRdRp knockout mutant via CRISPR-Cas9 or knockdown mutant by RNA interference (RNAi). These mRdRp mutants exhibited severe developmental defects, including dwarfism, embryo lethality, and sterility. Phenotypic assays further showed that mRdRp mutants displayed heightened susceptibility to ABA and rotenone, indicating impaired adaptive capacity to both hormonal and metabolic stress. Loss of mRdRp led to fragmented mitochondrial networks and a significant reduction in mitochondrial abundance in both leaf protoplasts and root meristematic cells. Additionally, mitochondrial-derived small RNA (sRNA) aberrantly accumulated in mRdRp mutants, which potentially disrupts endogenous RNA-silencing pathways that rely on sRNA-mediated gene regulation. Collectively, these results provide mechanistic insights into the function integration of a virus-derived gene into plant cellular networks, advancing our understanding of host\u2013virus coevolution and the role of horizontally transferred viral genes in shaping plant physiology.<\/jats:p>","DOI":"10.3390\/ijms26189035","type":"journal-article","created":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T08:03:47Z","timestamp":1758096227000},"page":"9035","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Genomic-Encoded Mitovirus RdRp Is Required for Embryo Development and Maintaining Mitochondrial Dynamics in Arabidopsis"],"prefix":"10.3390","volume":"26","author":[{"given":"Yadi","family":"Gong","sequence":"first","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rongqin","family":"Chen","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chen","family":"Yang","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yingcui","family":"Lu","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhenjie","family":"Fu","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ye","family":"Feng","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaomeng","family":"Li","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ling","family":"Li","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9947-3195","authenticated-orcid":false,"given":"Xiaoyun","family":"Li","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Science, South China Normal University, Guangzhou 510631, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1016\/j.cell.2005.02.001","article-title":"Mitochondria, Oxidants, and Aging","volume":"120","author":"Balaban","year":"2005","journal-title":"Cell"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"380","DOI":"10.1016\/S1055-7903(03)00194-5","article-title":"Evolution of Mitochondrial Gene Content: Gene Loss and Transfer to the Nucleus","volume":"29","author":"Adams","year":"2003","journal-title":"Mol. 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