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

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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)

摘要

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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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