The cytological instability of neoallopolyploids suggesting a potent way for DNA introgression: The case of synthetic hexaploid wheat x Aegilops peregrina

被引：0

作者：

Yang, Youwei ^{[1
,2
]}

Zhang, Lianquan ^{[1
,2
]}

Yan, Zehong ^{[1
,2
]}

Zheng, Youliang ^{[1
,2
]}

Liu, Dengcai ^{[1
,2
,3
]}

机构：

[1] Sichuan Agr Univ, Triticeae Res Inst, Wenjiang 611130, Sichuan, Peoples R China

[2] Sichuan Agr Univ, Key Lab Crop Genet Resources & Improvement, Minist Educ, Yaan 625014, Sichuan, Peoples R China

[3] Chinese Acad Sci, NW Plateau Inst Biol, Qinghai 810001, Peoples R China

来源：

AFRICAN JOURNAL OF AGRICULTURAL RESEARCH | 2011年 / 6卷 / 07期

关键词：

Aneuploids; common wheat; gene flow; neopolyploid; Ph1; GENOME EVOLUTION; POLYPLOID WHEAT; WILD RELATIVES; BREAD WHEAT; SEQUENCE; HYBRIDIZATION; RESTITUTION; FERTILITY; HYBRIDS; LINES;

D O I：

暂无

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

SHW-L1 is a newly synthetic hexaploid wheat, which has a genomic combination analogous to that of natural common wheat. In the present study, intergeneric F-1 hybrids of SHW-L1 - Aegilops peregrina AS24 were produced without embryo rescue. Among the 31 F-1 hybrid plants observed, 20 had the expected chromosome number 2n = 35 and were euploids (genome ABDUS(I)). The remainder 11 plants were aneuploids with 33, 34, 36 and 37 chromosomes, indicating that the neoallohexaploid SHW-L1 was cytologically instable and produced aneuhaploid gametes with 19, 20, 22 and 23 chromosomes, respectively. The hybrid plant lacking chromosome 5B carrying Ph1 showed a very high level of homoeologous chromosome pairing. The absence of Ph gene provides a potent cytological mechanism for DNA introgression among homoeologous chromosomes between newly synthetic wheat and wild species.

引用

页码：1692 / 1697

页数：6

共 33 条

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