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Molecules 2017, 22(6), 973;

Oligonucleotides and ND-FISH Displaying Different Arrangements of Tandem Repeats and Identification of Dasypyrum villosum Chromosomes in Wheat Backgrounds

1,2,* and 1,*
Provincial Key Laboratory of Plant Breeding and Genetics, Sichuan Agriculture University, Chengdu 611130, China
Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu 611130, China
These authors have contributed equally to this manuscript.
Authors to whom correspondence should be addressed.
Academic Editor: Harri Lönnberg
Received: 28 April 2017 / Revised: 8 June 2017 / Accepted: 9 June 2017 / Published: 14 June 2017
(This article belongs to the Special Issue Synthesis and Applications of Oligonucleotide Conjugates)
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Oligonucleotide probes and the non-denaturing fluorescence in situ hybridization (ND-FISH) technique are widely used to analyze plant chromosomes because they are convenient tools. New oligonucleotide probes, Oligo-Ku, Oligo-3B117.1, Oligo-3B117.2, Oligo-3B117.2.1, Oligo-3B117.3, Oligo-3B117.4, Oligo-3B117.5, Oligo-3B117.6, Oligo-pTa71A-1, Oligo-pTa71A-2, Oligo-pTa71B-1, Oligo-pTa71B-2, Oligo-pTa71C-1, Oligo-pTa71C-2, Oligo-pTa71C-3 and Oligo-pTa71D were designed based on the repetitive sequences KU.D15.15, pSc119.2-like sequence 3B117 and pTa71. Oligonucleotide probe (GT)7 was also used. Oligo-Ku and (GT)7 can be together used to identify Dasypyrum villosum from wheat chromosomes and to distinguish individual D. villosum chromosomes. The oligonucleotide probes that were derived from the same repeat sequence displayed different signal intensity and hybridization sites on the same chromosomes. Both the length and the nucleotide composition of oligonucleotide probes determined their signal intensity. For example, Oligo-3B117.2 (25 bp) and Oligo-pTa71A-2 (46 bp) produced the strongest signals on chromosomes of wheat (Triticum aestivum L.), rye (Secale cereale L.), barley (Hordeum vulgare ssp. vulgare) or D. villosum, the signal of Oligo-3B117.4 (18 bp) on the short arm of 7B chromosome was weaker than that of Oligo-3B117.2.1 (15 bp) and Oligo-3B117.3 (16 bp), and Oligo-pTa71A-1 (38 bp) produced the same strong signals as Oligo-pTa71A-2 did on 1B and 6B chromosomes, but its signals on 1R and 1V chromosomes were weaker than the ones of Oligo-pTa71A-2. Oligonucleotide probes and ND-FISH analysis can reflect the distribution and structural statues of different segments of tandem repeats on chromosomes. The possible reasons why different segments derived from the same repeat sequence produced different signal patterns are discussed. View Full-Text
Keywords: Triticeae; ND-FISH; chromosome; oligonucleotide probe; tandem repeats Triticeae; ND-FISH; chromosome; oligonucleotide probe; tandem repeats

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Xiao, Z.; Tang, S.; Qiu, L.; Tang, Z.; Fu, S. Oligonucleotides and ND-FISH Displaying Different Arrangements of Tandem Repeats and Identification of Dasypyrum villosum Chromosomes in Wheat Backgrounds. Molecules 2017, 22, 973.

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