Alteration of Terminal Heterochromatin and Chromosome Rearrangements in Derivatives of Wheat-Rye Hybrids

Shulan Fu; Zhenling Lv; Xiang Guo; Xiangqi Zhang; Fangpu Han

doi:10.1016/j.jgg.2013.05.005

Volume 40 Issue 8

Aug. 2013

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Article Navigation > Journal of Genetics and Genomics > 2013 > 40(8): 413-420

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Alteration of Terminal Heterochromatin and Chromosome Rearrangements in Derivatives of Wheat-Rye Hybrids

doi: 10.1016/j.jgg.2013.05.005

a
State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics, and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
b
Key Laboratory of Plant Breeding and Genetics, Sichuan Agriculture University, Chengdu 611130, China

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Corresponding author: E-mail address: fphan@genetics.ac.cn (Fangpu Han)
Received Date: 2013-03-14
Accepted Date: 2013-05-03
Rev Recd Date: 2013-04-28

Available Online: 2013-06-10

Publish Date: 2013-08-20

Abstract

Abstract

Wheat-rye addition and substitution lines and their self progenies revealed variations in telomeric heterochromatin and centromeres. Furthermore, a mitotically unstable dicentric chromosome and stable multicentric chromosomes were observed in the progeny of a Chinese Spring-Imperial rye 3R addition line. An unstable multicentric chromosome was found in the progeny of a 6R/6D substitution line. Drastic variation of terminal heterochromatin including movement and disappearance of terminal heterochromatin occurred in the progeny of wheat-rye addition line 3R, and the 5RS ditelosomic addition line. Highly stable minichromosomes were observed in the progeny of a monosomic 4R addition line, a ditelosomic 5RS addition line and a 6R/6D substitution line. Minichromosomes, with and without the FISH signals for telomeric DNA (TTTAGGG)_n, derived from a monosomic 4R addition line are stable and transmissible to the next generation. The results indicated that centromeres and terminal heterochromatin can be profoundly altered in wheat-rye hybrid derivatives.
- Wheat-Rye addition lines,
- Chromosome rearrangements,
- Multiple centromeres,
- Minichromosomes,
- Heterochromatin

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References(51)

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