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엽록체 전장유전체 정보를 이용한 Solanum hougasii 특이적 분자마커 개발

Development of Solanum hougasii-specific markers using the complete chloroplast genome sequences of Solanum species

  • 김수정 (대구대학교 과학생명융합대학 원예학과) ;
  • 박태호 (대구대학교 과학생명융합대학 원예학과)
  • 투고 : 2020.06.11
  • 심사 : 2020.06.18
  • 발행 : 2020.06.30

초록

Solanum hougasii는 감자 야생종 중의 하나로 다양한 종류의 병원균에 대해 저항성을 가지고 있어 감자 육종에서 중요한 재료로 이용되고 있다. S. hougasii는 이질6배체이나 4배체인 감자와 EBN이 4로 같아 직접적인 교배로 육종에 활용될 수 있다. 본 연구에서는 NGS 기술에 의해 완성된 S. hougasii의 엽록체 전장 유전체(cpDNA)와 이를 다른 Solanum종과의 비교를 통해 개발한 분자마커에 대해 보고하였다. S. hougasii의 전체 cpDNA의 크기는 155,549 bp였으며 그 구조는 다른 Solanum 종과 매우 유사하였다. S. hougasii의 cpDNA와 가지과에 속하는 10개 종의 cpDNA 코딩서열을 이용하여 분석한 계통수에서는 S. hougasii와 S. stoloniferum이 거의 동일한 유전체 구성을 보였으며, 다음으로 S. berthaultii 및 S. tuberosum과 유연관계가 가까운 것으로 확인되었다. S. hougasii와 다른 다섯 종의 Solanum과의 전체 cpDNA 다중 정렬을 통해 S. hougasii 특이적인 다섯 개의 InDel과 43개의 SNP 영역을 구명하였으며 이를 기반으로 최종적으로 PCR을 기반으로 한 네 개의 S. hougasii 특이적 마커를 개발하였다. 본 연구의 결과는 Solanum 종들을 대상으로 한 조금 더 세부적인 진화적 그리고 육종적 측면에서의 연구에 기여를 할 수 있을 것이다.

Solanum hougasii, one of the wild Solanum species, has been widely used in potato breeding since it exhibits excellent resistance to diverse important pathogens. S. hougasii can be directly crossed with the cultivated tetraploid potato (S. tuberosum) owing to its EBN (Endosperm Balanced Number) value of 4, which is same as that of S. tuberosum although it is an allohexaploid. In this study, the complete chloroplast genome sequence of S. hougasii was obtained by next-generation sequencing technology, and compared with that of the chloroplast genome of seven other Solanum species to identify S. hougasii-specific PCR markers. The length of the complete chloroplast genome of S. hougasii was 155,549 bp. The structural organization of the chloroplast genome in S. hougasii was found to be similar to that of seven other Solanum species studied. Phylogenetic analysis of S. hougasii with ten other Solanaceae family members revealed that S. hougasii was most closely related to S. stoloniferum, followed by S. berthaultii, and S. tuberosum. Additional comparison of the chloroplast genome sequence with that of five other Solanum species revealed five InDels and 43 SNPs specific to S. hougasii. Based on these SNPs, four PCR-based markers were developed for the differentiation of S. hougasii from other Solanum species. The results obtained in this study will aid in exploring the evolutionary and breeding aspects of Solanum species.

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