Formation of unreduced gametes is impeded by homologous

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	Formation of unreduced gametes is impeded by homologous
	Chun-Jie Wang; Shou-Fen Dai; You-Liang Zheng; Zhang HG(张怀刚); Liu DC(刘登才)
	2010-05-10
发表期刊	Euphytica
ISSN	1573-5060
卷号	157 页码:323-329
摘要	It is believed that unreduced gametes with somatic chromosome numbers play a predominant role in natural polyploidization. Allohexaploid bread wheat originated from spontaneous hybridization of Triticum turgidum L. with Aegilops tauschii Coss. Unreduced gametes originating via meiotic restitution, including first-division restitution (FDR) and single-division meiosis (SDM), are well documented in triploid F1 hybrids of T. turgidum with diploid Ae. tauschii (genomic constitution ABD, usually with 21 univalents in meiotic metaphase I). In this study, two T. turgidum lines known to carry genes for meiotic restitution were crossed to tetraploid Ae. tauschii. The resulting F1 hybrids (genomes ABDD), had seven pairs of homologous chromosomes and regularly formed 14 univalents and seven bivalents at metaphase I. Neither FDR nor SDM were observed. The distribution of chromosome numbers among progeny obtained by self pollination and a backcross to T. turgidum showed the absence of unreduced gametes. These results suggest that high homologous pairing interfered with meiotic restitution and the formation of unreduced gametes. This may be related to asynchronous movement during meiosis between paired and unpaired chromosomes or to uneven distribution of chromosomes in anaphases, resulting in nonviable gametes.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/2048
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Chun-Jie Wang,Shou-Fen Dai,You-Liang Zheng,et al. Formation of unreduced gametes is impeded by homologous[J]. Euphytica,2010,157:323-329.
APA	Chun-Jie Wang,Shou-Fen Dai,You-Liang Zheng,张怀刚,&刘登才.(2010).Formation of unreduced gametes is impeded by homologous.Euphytica,157,323-329.
MLA	Chun-Jie Wang,et al."Formation of unreduced gametes is impeded by homologous".Euphytica 157(2010):323-329.

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