Parent-of-Origin-Effect rough endosperm Mutants in Maize

文献类型： 外文期刊

第一作者： Bai, Fang

作者： Bai, Fang;Daliberti, Mary;Bagadion, Alyssa;Li, Yubing;Baier, John;Tseung, Chi-Wah;Settles, A. Mark;Bai, Fang;Daliberti, Mary;Bagadion, Alyssa;Li, Yubing;Baier, John;Tseung, Chi-Wah;Settles, A. Mark;Xu, Miaoyun;Evans, Matthew M. S.

作者机构：

关键词： parent-of-origin effect;gametophyte;imprinting;seed;endosperm

期刊名称：GENETICS （ 影响因子：4.562； 五年影响因子：4.845 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Parent-of-origin-effect loci have non-Mendelian inheritance in which phenotypes are determined by either the maternal or paternal allele alone. In angiosperms, parent-of-origin effects can be caused by loci required for gametophyte development or by imprinted genes needed for seed development. Few parent-of-origin-effect loci have been identified in maize (Zea mays) even though there are a large number of imprinted genes known from transcriptomics. We screened rough endosperm (rgh) mutants for parent-of-origin effects using reciprocal crosses with inbred parents. Six maternal rough endosperm (mre) and three paternal rough endosperm (pre) mutants were identified with three mre loci mapped. When inherited from the female parent, mre/+ seeds reduce grain fill with a rough, etched, or pitted endosperm surface. Pollen transmission of pre mutants results in rgh endosperm as well as embryo lethality. Eight of the mutants had significant distortion from the expected one-to-one ratio for parent-of-origin effects. Linked markers for mre1, mre2, and mre3 indicated that the mutant alleles have no bias in transmission. Histological analysis of mre1, mre2, mre3, and pre*-949 showed altered timing of starch grain accumulation and basal endosperm transfer cell layer (BETL) development. The mre1 locus delays BETL and starchy endosperm development, while mre2 and pre*-949 cause ectopic starchy endosperm differentiation. We conclude that many parent-of-origin effects in maize have incomplete penetrance of kernel phenotypes and that there is a large diversity of endosperm developmental roles for parent-of-origin-effect loci.

分类号： R394

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