The evolution of the hexaploid grass Zingeria kochii (Mez) Tzvel. (2n=12) was accompanied by complex hybridization and uniparental loss of ribosomal DNA
The evolution of the hexaploid grass Zingeria kochii (Mez) Tzvel. (2n=12) was accompanied by complex hybridization and uniparental loss of ribosomal DNA
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DOI：
10.1016/j.ympev.2010.01.003
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发表时间：
2010-07-01
影响因子：
4.1
通讯作者：
Houben, Andreas
中科院分区：
文献类型：
--
作者：
Kotseruba, Violetta;Pistrick, Klaus;Houben, Andreas
在禾本科中，有一小群类群的染色体数目非常低，为2n = 2x = 4，属于密切相关的Colpodium属和Zingeria属。为了了解多倍体的形成，在这个组中，我们分析了异源六倍体姜（2n = 12）和它的推测祖先种的进化。基因组原位杂交结果表明，Z. kochii是由一个种间杂种进化而来的，它包括与当代Z. biebersteiniana（2n = 4）和变色草Colpodium versicolor（2n = 4）;异源多倍化后，kochii Biebersteiniana样亲本染色体经历核糖体DNA的丢失。45 SrDNA在Z. kochii和系统发育分析表明，变色绒螯蟹将其基因组贡献给了Z. Kochii最近。原位杂交是特别有效的了解异源多倍体的进化，而单独的ITS序列的分析会导致错误的解释属的异源多倍体的历史。(C)2010年爱思唯尔公司All rights reserved.
In the grass tribe Poeae a small group of taxa occur with an exceptionally low chromosome number of 2n = 2x = 4 belonging to the closely related genera Colpodium and Zingeria. To understand the formation of polyploids in this group we analyzed the evolution of allohexaploid Zingeria kochii (2n = 12) and its presumable ancestral species. Genomic in situ hybridization demonstrated that Z. kochii evolved from an interspecific hybrid involving species closely related to contemporary Z. biebersteiniana (2n = 4) and Colpodium versicolor (2n = 4) and a third unknown species. Following allopolyploidization of Z. kochii the biebersteiniana-like parental chromosomes underwent loss of ribosomal DNA. No interlocus homogenization of 45S rDNA took place in Z. kochii and phylogenetic analysis showed that C versicolor contributed its genome to Z. kochii relatively recently. In situ hybridization was particularly effective in understanding the allopolyploid evolution in Zingeria while the analysis of ITS sequences alone would have resulted in a wrong interpretation of the allopolyploid history of the genus. (C) 2010 Elsevier Inc. All rights reserved.