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Chloroplast genome sequence and PCR-based markers for S. cardiophyllum

감자 근연야생종 Solanum cardiophyllum의 엽록체 전장유전체 구명 및 이를 이용한 S. cardiophyllum 특이적 분자마커의 개발

  • Tae-Ho Park (Department of Horticulture, Daegu University)
  • Received : 2023.03.31
  • Accepted : 2023.04.12
  • Published : 2023.04.26

Abstract

The diploid Solanum cardiophyllum, a wild tuberbearing species from Mexico is one of the relatives to potato, S. tuberosum. It has been identified as a source of resistance to crucial pathogens and insects such as Phytophthora infestans, Potato virus Y, Colorado potato beetle, etc. and is widely used for potato breeding. However, the sexual hybridization between S. cardiophyllum and S. tuberosum is limited due to their incompatibility. Therefore, somatic hybridization can introduce beneficial traits from this wild species into the potato. After somatic hybridization, selecting fusion products using molecular markers is essential. In the current study, the chloroplast genome of S. cardiophyllum was sequenced by next-generation sequencing technology and compared with those of other Solanum species to develop S. cardiophyllum-specific markers. The total length of the S. cardiophyllum chloroplast genome was 155,570 bp and its size, gene content, order and orientation were similar to those of the other Solanum species. Phylogenic analysis with 32 other Solanaceae species revealed that S. cardiophyllum was expectedly grouped with other Solanum species and most closely located with S. bulbocastanum. Through detailed comparisons of the chloroplast genome sequences of eight Solanum species, we identified 13 SNPs specific to S. cardiophyllum. Further, four SNP-specific PCR markers were developed for discriminating S. cardiophyllum from other Solanum species. The results obtained in this study would help to explore the evolutionary aspects of Solanum species and accelerate breeding using S. cardiophyllum.

멕시코 유래의 2배체 감자 근연야생종 Solanum cardiophyllum은 감자역병, 감자바이러스Y, 콜로라도감자잎벌레 등과 같은 병원균 및 해충에 대한 저항성을 가지고 있어 감자의 신품종 육성에 이용되고 있다. 재배종 감자에 이러한 형질을 도입하기 위해서는 전통적인 교잡육종에 의해 이루어질 수 있으나, 재배종 감자와 근연야생종과의 서로 다른 EBN에 따라 제한적이며, S. tuberosum과 S. cardiophyllum 간에도 생리적 불화합성이 존재한다. 따라서, 이러한 생리적 장벽의 극복을 위해 체세포융합에 의한 체세포잡종 계통을 육성하고 이를 감자 신품종 육성에 활용할 수 있는데, 분자 마커는 적절한 체세포잡종 계통 선발에 필요하다. 이에, 본 연구에서는 S. cardiophyllum의 전체 엽록체 유전체 정보를 구명하고 8개의 다른 Solanum 종의 전체 엽록체 유전체 정보와 비교하여 S. cardiophyllum 특이적인 분자마커를 개발하였다. S. cardiophyllum의 전체 엽록체 유전체의 길이는 155,570 bp였으며, 그 구조와 유전자 구성은 다른 Solanum 종들과 매우 유사하였고 가지과에 속해 다른 32개의 종들과의 계통수 분석을 통해 예상했던 바와 같이 다른 Solanum 종과 같은 그룹에 속해 있고 S. bulbocastanum과의 가장 근접한 유연관계를 확인하였다. S. cardiophyllum의 전체 엽록체 유전체와 8개 다른 Solanum 종의 전체 엽록체 유전체의 다중 정렬 결과로 총 13개의 S. cardiophyllum 특이적인 SNP 영역을 확인하였으며, 이 정보를 이용하여 4개의 PCR 기반 분자마커를 개발하였다. 본 연구의 결과는 S. cardiophyllum의 진화적 측면에서의 연구와 S. cardiophyllum를 이용한 감자 신품종 육성을 위한 연구에 기여를 할 수 있을 것이다.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. NRF-2021R1F1A1045981).

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