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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (8): 1649-1663.doi: 10.16420/j.issn.0513-353x.2022-0721

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Genetic Analysis of Chloroplast Genome Characteristics of Potato‘Cooperation 88’Selfing Population

WANG Rongyan1,2, LI Qing1,2, XU Ling1, WANG Qiujie1, SONG Yu1,2, MU Changran1, TANG Wei1,2,*(), HAO Dahai1,2,*()   

  1. 1 School of Life Sciences,Yunnan Normal University,Kunming 650500,China
    2 Key Laboratory for Potato Biology of Yunnan Province,Kunming 650500,China
  • Received:2023-03-09 Revised:2023-04-28 Online:2023-08-25 Published:2023-08-23
  • Contact: TANG Wei, HAO Dahai

Abstract:

In order to analyze the chloroplast genome polymorphism and genetic diversity of potato ‘Cooperation 88’at the genome level and to understand the genetic composition and variation of the chloroplast genome of the selfing population of‘Cooperation 88’,this study assembled the chloroplast genomes of‘Cooperation 88’and 30 selfing progenies and comparatively analyzed them with the chloroplasts genomes of 11 other Solanaceae species,Arabidopsis thaliana and Oryza sativa. The results showed that the assembled chloroplast genome of the‘Cooperation 88’was a typical circular structure with a length of 160 323 bp and the GC content of 38.6%,including a total of 29 annotated tRNA genes and 77 protein-coding genes. The size of the chloroplast genome of the 30 selfing progenies ranged from 160 331 bp to 162 120 bp,the number of genes predicted was 95-106,and the GC content was 36.7%-38.6%. Further analysis showed that the chloroplast types of the parent and 30 selfing progeny were all W-type,showing no polymorphism. Both parent and selfing progenies prefer to use codons ending with A/U,and the progenies chloroplasts genomes codon pairs used different frequencies of the four bases,indicating that the relative synonymous codon usage and effective codons in the chloroplast genome of selfing progenies variations in the number of codons and high-frequency codons were caused by random mutation and translational natural selection in the chloroplast genome. In addition,12 repeats existing in the parent were also present in all progenies but four repeats were new appeared in progeny. UPGMA analysis and collinearity analysis also found that the evolutionary level of the Solanum chloroplast genome was highly conserved, but the appearance of repeats and the loss of genes changed the size of the progeny chloroplast genome and increased their genetic diversity.

Key words: potato, selfing population, chloroplast genome, repeat sequence, codon bias