Crops ›› 2021, Vol. 37 ›› Issue (4): 10-17.doi: 10.16035/j.issn.1001-7283.2021.04.002

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Chromosomal Localization of Ribosomal DNA and Phylogenetic Analysis of 45S rDNA in Avena

Wang Bingce1(), Liu Xiaojuan1(), Cheng Bin2, Ren Mingjian1, Xu Ruhong1, Zhang Suqin1, Zhang Liyi2, He Fang1()   

  1. 1College of Agriculture, Guizhou University/Guizhou Subcenter of National Wheat Improvement Center, Guiyang 550025, Guizhou, China
    2Institute of Upland Crops, Guizhou Academy of Agriculture Sciences, Guiyang 550006, Guizhou, China
  • Received:2020-08-05 Revised:2021-04-25 Online:2021-08-15 Published:2021-08-13
  • Contact: He Fang E-mail:bingcew0721@163.com;lxj831508@163.com;fhe1@gzu.edu.cn

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Abstract:

Due to the incomplete information on the diploid donor, the origin and phylogenetic relationship of oats have been controversial. The fluorescence in situ hybridization (FISH) method was used to detect the location information of 45S rDNA and 5S rDNA on the chromosomes of different ploidy plants of Avena. The molecular evolution tree was constructed based on the published full-length DNA sequence of the 45S rDNA ITS region. This paper discussed the locus changes, evolution laws, and differentiation mechanisms of 45S rDNA in different genomes of oats plants and provided references for exploring the origin and evolution of oat species.

Key words: Avena L., 45S rDNA, Fluorescence in situ hybridization, ITS

Fig.1

Mitotic chromosome in oat species a: A. ventricosa; b: A. strigosa; c: A. barbata; d: A. fatua var. portugal; e: A. fatua var. glabrata; f: A. sativa 16Co2"

Table 1

The information of signals of 45S rDNA and 5S rDNA in oat species"

物种
Species		 基因组
Genome		 染色体数目
Chromosome
number		 位点
Signal		 位点数目
Number of signals		 信号分布区域
Signal region		 信号强弱
Signal lightness
砂燕麦
A. strigosa		 AsAs 2n=2x=14 45S 4 染色体端部 较强
5S 4 1对位于染色体端部,1对位于染色体中部 较弱
偏凸燕麦
A. ventricosa		 CvCv 2n=2x=14 45S 6 2对位于染色体端部,1对位于染色体中部 较弱
5S 2 染色体中部 较弱
裂稃燕麦
A. barbata		 AABB 2n=4x=28 45S 4 染色体端部 1强1弱
5S 6 1对位于染色体端部,2对位于染色体中部 较弱
葡萄牙野燕麦
A. fatua var. portugal		 AACCDD 2n=6x=42 45S 6 染色体端部 较强
5S 6 2对位于染色体端部,1对位于染色体中部 较弱
光稃野燕麦
A. fatua var. glabrata		 AACCDD 2n=6x=42 45S 6 染色体端部 较强
5S 6 2对位于染色体端部,1对位于染色体中部 较弱
栽培燕麦16Co1
A. sativa 16Co1		 AACCDD 2n=6x=42 45S 6 染色体端部 较强
5S 6 2对位于染色体端部,1对位于染色体中部 较弱
栽培燕麦16Co2
A. sativa 16Co2		 AACCDD 2n=6x=42 45S 6 染色体端部 较强
5S 6 2对位于染色体端部,1对位于染色体中部 较弱

Fig.2

45S rDNA and 5S rDNA FISH identification of mitotic chromosomes in oat species a: A. strigosa; b: A. ventricosa; c A. barbata; d: A. fatua var. glabrata; e: A. sativa (16Co1); f: A. sativa (16Co2)"

Table 2

Full length DNA sequence of 45S rDNA ITS region from published oat species"

物种Species 基因组Genome 染色体数目Chromosome number 序列数Sequence number 序列名Sequence name
加那利燕麦A. canariensis AcAc 2n=2x=14 5 can1 Ac-can5 Ac
大马士革燕麦A. damascena AdAd 2n=2x=14 9 dam1 Ad-dam9 Ad
长颖燕麦A. longiglumis AlAl 2n=2x=14 6 lon1 Al-lon6 Al
砂燕麦A. strigosa AsAs 2n=2x=14 3 str1 As-str3 As
沙漠燕麦A. wiestii AsAs 2n=2x=14 9 wie1 As-wie9 As
大西洋燕麦A. atlantica AsAs 2n=2x=14 6 atl1 As-atl6 As
A. hirtula AsAs 2n=2x=14 6 hir1 As-hir6 As
A. lusitanica AsAs 2n=2x=14 4 lus1 As-lus4 As
短燕麦A. brevis AsAs 2n=2x=14 3 bre1 nA-sbre3 As
A. hispanica AsAs 2n=2x=14 4 his1 As-his4 As
异颖燕麦A. eriantha CpCp 2n=2x=14 9 eri1 Cp-eri9 Cp
物种Species 基因组Genome 染色体数目Chromosome number 序列数Sequence number 序列名Sequence name
不完全燕麦A. clauda CpCp 2n=2x=14 9 cla1 Cp-cla9 Cp
A. pilosa CpCp 2n=2x=14 1 pil1 Cp
偏凸燕麦A. ventricosa CvCv 2n=2x=14 5 ven1 Cv-ven5 Cv
裂稃燕麦A. barbata AABB 2n=4x=28 16 bar1 AB-bar16 AB
阿比西尼亚燕麦A. abyssinica AABB 2n=4x=28 9 aby1 AB-aby9 AB
A. agadiriana AABB 2n=4x=28 7 aga1 AB-aga7 AB
瓦维洛夫燕麦A. vaviloviana AABB 2n=4x=28 7 vav1 AB-vav7 AB
岛屿燕麦A. insularis AACC 2n=4x=28 4 ins1 AC-ins4 AC
大燕麦A. maroccana AACC 2n=4x=28 9 mar1 AC-mar9 AC
墨菲燕麦A. murphyi AACC 2n=4x=28 6 mur1 AC-mur6 AC
大穗燕麦A. macrostachya CmCmCmCm 2n=4x=28 10 mac1 CmCm-mac10 CmCm
野燕麦A. fatua AACCDD 2n=6x=42 21 fat1 ACD-fat21 ACD
普通栽培燕麦A. sativa AACCDD 2n=6x=42 16 sat1 ACD-sat16 ACD
野红燕麦A. sterilis AACCDD 2n=6x=42 11 ste1 ACD-ste11 ACD
A. occidentalis AACCDD 2n=6x=42 12 occ1 ACD-occ12 ACD
大粒裸燕麦A. nuda AACCDD 2n=6x=42 6 nud1 ACD-nud6 ACD
地中海燕麦A. byzantina AACCDD 2n=6x=42 1 byz1 ACD

Fig.3

Construction of 45S rDNA sequence phylogenetic tree of oat species and wheat"

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