Alien DNA introgression and wheat DNA rearrangements in a stable wheat line derived from the early generation of distant hybridization.
Polyploidy has been found to be common in plants. Bread or common wheat (Triticum aestivum L., 2n=42) is a good example of allopolyploid made up of three diploid genomes A, B and D. In recent years, by the study of mimicking the origination of common wheat, it was found that changes of DNA sequence and gene expression occurred at the early stages of artificial allohexaploid between tetraploid wheat and Aegilops tauschii, which was probably favorable to genetic diploidization of new synthetic hexaploid wheat. Common wheat 99L2 is a new line stable in genetic, which was derived from the early self-pollinated generation of wide hybrids between common wheat and rye. In this study, it was found that at least two rye DNA segments had been introgressed into 99L2. This result suggested that a mechanism of alien DNA introgression may exist, which was different from the traditional mechanism of chromosome pairing and DNA recombination between wheat and alien species. Meanwhile, during the introgression process of alien rye DNA segments, the changes in DNA sequences of wheat itself occurred.
Zhang
Lianquan
L
Triticeae Research Institute, Sichuan Agricultural University, Dujiangyan 611830, China.
Liu
Dengcai
D
Yan
Zehong
Z
Zheng
Youliang
Y
D001483:Base Sequence; D001692:Biological Transport / Q000235:genetics; D018744:DNA, Plant / Q000378:metabolism*; D015321:Gene Rearrangement; D005819:Genetic Markers / Q000235:genetics; D005983:Glutens; D006824:Hybridization, Genetic; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique; D012434:Secale / Q000235:genetics*; D016615:Telomere / Q000235:genetics; D014908:Triticum / Q000235:genetics*
D018744:DNA, Plant; D005819:Genetic Markers; D010940:Plant Proteins; D005983:Glutens