title: Alteration of terminal heterochromatin and chromosome rearrangements in derivatives of wheat-rye hybrids.
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.
authors: State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics, and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors: Shulan
authors: S
authors: Fu
authors: Zhenling
authors: Z
authors: Lv
authors: Xiang
authors: X
authors: Guo
authors: Xiangqi
authors: X
authors: Zhang
authors: Fangpu
authors: F
authors: Han
mesh_terms: D002503:Centromere / Q000235:genetics; D002678:Chimera / Q000235:genetics*; D002869:Chromosome Aberrations; D032461:Chromosomes, Plant / Q000235:genetics*; D015321:Gene Rearrangement; D006570:Heterochromatin / Q000235:genetics*; D006824:Hybridization, Genetic; D012434:Secale / Q000235:genetics*; D014908:Triticum / Q000235:genetics*
chemical_list: D006570:Heterochromatin
keywords: Chromosome rearrangements; Heterochromatin; Minichromosomes; Multiple centromeres; Wheat-Rye addition lines