Paternal imprinting of dosage-effect defective1 contributes to seed weight xenia in maize

文献类型： 外文期刊

第一作者： Dai, Dawei

作者： Dai, Dawei;Mudunkothge, Janaki S.;Gustin, Jeffery L.;Spielbauer, Gertraud;Zhang, Junya;Settles, A. Mark;Galli, Mary;Gallavotti, Andrea;Char, Si Nian;Yang, Bing;Davenport, Ruth;Barbazuk, W. Brad;Zhou, Xiaojin;Gustin, Jeffery L.;Yang, Bing;Gallavotti, Andrea;Settles, A. Mark

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：17.694； 五年影响因子：17.763 ）

ISSN：

年卷期： 2022 年 13 卷 1 期

页码：

收录情况： SCI

摘要： Xenia effects describe the genetic contribution of pollen to seed phenotypes. Here the authors show that paternal imprinting of Ded1 contributes to the xenia effect in maize by setting the pace of endosperm development. Historically, xenia effects were hypothesized to be unique genetic contributions of pollen to seed phenotype, but most examples represent standard complementation of Mendelian traits. We identified the imprinted dosage-effect defective1 (ded1) locus in maize (Zea mays) as a paternal regulator of seed size and development. Hypomorphic alleles show a 5-10% seed weight reduction when ded1 is transmitted through the male, while homozygous mutants are defective with a 70-90% seed weight reduction. Ded1 encodes an R2R3-MYB transcription factor expressed specifically during early endosperm development with paternal allele bias. DED1 directly activates early endosperm genes and endosperm adjacent to scutellum cell layer genes, while directly repressing late grain-fill genes. These results demonstrate xenia as originally defined: Imprinting of Ded1 causes the paternal allele to set the pace of endosperm development thereby influencing grain set and size.

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