Karyotyping and identifying all of the chromosomes of allopolyploid Brassica juncea using multicolor FISH

Karyotyping and identifying all of the chromosomes of allopolyploid Brassica juncea using multicolor FISH
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使用多色 FISH 对异源多倍体芥菜的所有染色体进行核型分析和鉴定

DOI:
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发表时间:
2016-08
期刊:
The Crop Journal
影响因子:
--
通讯作者:
Zhiyong Xiong
Zhiyong Xiong
中科院分区:
其他
文献类型:
--
作者:
Zhijun Xu;Bei Xie;Tian Wu;Xiaoxia Xin;Lingyu Mang;Guangxuan Tan;Zhiyong Xiong

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利用荧光原位杂交技术进行染色体鉴定和核型分析,为基因组和细胞遗传学研究提供了技术平台。芥菜(Brassica juncea,2n = 4× = 36; genome AABB)是由芜菁(Brassica rapa)和黑芥(Brassica nigra)自发杂交产生的异源多倍体植物,具有许多重要的性状。在这项研究中,一个荧光原位杂交程序,允许所有18个染色体对的鉴定开发了两步杂交与探针在相同的中期染色体。6个重复序列(卫星重复p Br STR、5SrDNA、45 SrDNA、B基因组特异性重复p BNBH 35和着丝粒卫星重复Cent Br 1和Cent Br 2)在B染色体上的分布和定位。比较核型分析表明,芥菜型油菜的染色体组相对稳定,B的3份材料存在种内核型多样性。Juncea。本研究为B的基因组进化提供了有价值的信息。juncea和一个工具包,将有助于染色体鉴定。
Chromosome identification and karyotype using fluorescence in situ hybridization(FISH)provides a technical platform for genome and cytogenetic studies. Brassica juncea(brown mustard, 2n = 4× = 36; genome AABB) is an allopolyploid species that originated from a spontaneous hybridization of Brassica rapa and Brassica nigra and contains many valuable traits. In this study, a multicolor FISH procedure allowing the identification of all 18 chromosomal pairs was developed by two-step hybridizations with probes on the same metaphase chromosomes. The distribution patterns and chromosomal localizations of six repeat sequences(satellite repeat p Br STR, 5S r DNA, 45 S r DNA, B genome-specific repeat p BNBH35, and centromeric satellite repeats Cent Br1 and Cent Br2) on B. juncea chromosomes were characterized.Comparative karyotype analyses showed that the genome is relatively stable in comparison with its diploid progenitor species and revealed intraspecific karyotypic diversity among three accessions of B. juncea. This study provides valuable information about the genome evolution of B. juncea and a toolkit that will be helpful for chromosome identification.
DOI: --
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