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• W4386811604 abstract "The parent-of-origin effect on seed size can result from imprinting or a combinational effect between cytoplasmic and nuclear genomes, but their relative contributions remain unknown. To discern these confounding effects, we generated cytoplasmic-nuclear substitution (CNS) lines using recurrent backcrossing in the Arabidopsis thaliana ecotypes Col-0 and C24. These CNS lines differ only in the nuclear genome (imprinting) or in the cytoplasm. The CNS reciprocal hybrids with the same cytoplasm display a ∼20% seed size difference as observed in the conventional hybrids. However, seed size is similar between the reciprocal cybrids with fixed imprinting. Transcriptome analyses in the endosperm of CNS hybrids using laser-capture microdissection have identified 104 maternally expressed genes (MEGs) and 90 paternally-expressed genes (PEGs). These imprinted genes are involved in pectin catabolism and cell wall modification in the endosperm. HDG9 , an epiallele and one of 11 cross-specific imprinted genes, controls seed size. In the embryo, a handful of imprinted genes is found in the CNS hybrids but only one is expressed higher in the embryo than endosperm. AT4G13495 encodes a long-noncoding RNA (lncRNA), but no obvious seed phenotype is observed in the lncRNA knockout lines. NRPD1 , encoding the largest subunit of RNA Pol IV, is involved in the biogenesis of small interfering RNAs. Seed size and embryo is larger in the cross using nrpd1 as the maternal parent than in the reciprocal cross. In spite of limited ecotypes tested, these results suggest potential roles of imprinting and NRPD1 -mediated small RNA pathway in seed size variation in hybrids." @default.
• W4386811604 created "2023-09-18" @default.
• W4386811604 creator A5035071106 @default.
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• W4386811604 date "2023-09-17" @default.
• W4386811604 modified "2023-10-17" @default.
• W4386811604 title "Imprinting but not cytonuclear interactions affects parent-of-origin effect on seed size in Arabidopsis hybrids" @default.
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• W4386811604 doi "https://doi.org/10.1101/2023.09.15.557997" @default.
• W4386811604 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37745544" @default.
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