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Bioinformatics Analysis and Chromosome Location of Nuclear Integrants of Plastid DNA in Asparagus officinalis

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  • 1. College of Life Sciences, Henan Normal University, Xinxiang 453007, China
    2.SanQuan College, Xinxiang Medical University, Xinxiang 453003, China

Received date: 2018-05-11

  Accepted date: 2018-08-06

  Online published: 2018-12-07

Abstract

Chloroplast DNA (cpDNA) can transfer into the plant nuclear genome to form nuclear integrants of plastid DNA (NUPTs). NUPTs may play a role in plant sex chromosome evolution. However, few studies have focused on this research area. In this study, we annotated and analyzed NUPTs in the genome of dioecious Asparagus officinalis and located two cpDNA fragments on chromosomes. The nuclear genome of A. officinalis contains 2 239 NUPT insertions, with total length 565 970 bp, accounting for 0.047% of the genome. The amount of NUPTs differs among chromosomes; the number, density, and the average length of NUPTs on the Y chromosome were all higher than those on the other chromosomes, which indicates more accumulation of NUPTs on sex chromosomes. All regions of inverted repeats (IRs) and small and large single copy regions of cpDNA could transfer into nuclear DNA; however, the IR region showed the highest transfer frequency. Furthermore, FISH analysis of two cpDNA sequences from IR regions showed that AocpIR1 distributed mainly on the centromeres of all chromosomes, whereas AocpIR2 specifically located on sex chromosomes of A. officinalis. The data provide an important foundation for determining the genome structure and sex chromosome evolution of A. officinalis.

Cite this article

Guangqian Cheng,Keli Jia,Na Li,Chuanliang Deng,Shufen Li,Wujun Gao . Bioinformatics Analysis and Chromosome Location of Nuclear Integrants of Plastid DNA in Asparagus officinalis[J]. Chinese Bulletin of Botany, 2019 , 54(3) : 328 -334 . DOI: 10.11983/CBB18117

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