Journal of Plant Biology

, Volume 52, Issue 1, pp 49–55

Expression Profiles of Genes Involved in the Carotenoid Biosynthetic Pathway in Yellow-Fleshed Potato Cultivars (Solanum tuberosum L.) from South Korea

  • Young-Min Goo
  • Tae-Won Kim
  • Sun-Hwa Ha
  • Kyoung-Whan Back
  • Jung-Myung Bae
  • Yong-Wook Shin
  • Cheol-Ho Lee
  • Mi-Jeong Ahn
  • Shin-Woo Lee
Original Research

DOI: 10.1007/s12374-008-9003-9

Cite this article as:
Goo, Y., Kim, T., Ha, S. et al. J. Plant Biol. (2009) 52: 49. doi:10.1007/s12374-008-9003-9

Abstract

Efforts are being made to identify a parental cultivar suitable for metabolic engineering of potato (Solanum tuberosum L.) that will elevate total carotenoid content or produce a specific type of carotenoid. As an initial step in this search, we performed high performance liquid chromatography analyses and comparisons among gene expression profiles for several cultivars domesticated or bred in South Korea. Here, the dark yellow-fleshed “Golden Valley” contained the highest level of total carotenoids (23.8 μg g−1 dry weight (DW)), which was 1.7- to 3.7-fold higher than those measured in other cultivars. The predominant carotenoids in “Golden Valley” were lutein (40.3% of the total), violaxanthin (29.8%), and β-carotene (8.8%), with only a trace amount of zeaxanthin (0.02%) being detected. Levels of lutein and β-carotene in that cultivar were significantly higher than in the others. Interestingly, relatively high amounts of violaxanthin were accumulated in all cultivars, ranging from 15.9% (1.0 μg g−1 DW in “Jowon”) to 61.7% (8.2 μg g−1 DW in “Dejima”). In accordance with the relatively high content of total carotenoids in “Golden Valley”, remarkably elevated transcripts were also accumulated for most of the genes involved in the carotenoid biosynthetic pathway. In particular, genes encoding enzymes for the first three steps of carotenogenesis—phytoene synthase, phytoene desaturase, and ζ-carotene desaturase—were most actively expressed. A relatively high level of transcript for the carotene hydroxylase (Chy2) gene was detected in all cultivars, including “Jowon”, which had accumulated the lowest amount of total carotenoids. In contrast, almost no transcripts were detected for carotene isomerase (CrtIso) and Chy1 in any of these cultivars. Our preliminary results suggest that “Golden Valley” is an excellent candidate for metabolic engineering that further increases its content of specific carotenoids, e.g., β-carotene and astaxanthin.

Keywords

β-CaroteneCarotenogenesis-related genesCarotenoidsLuteinPotatoViolaxanthin

Copyright information

© The Botanical Society of Korea 2009

Authors and Affiliations

  • Young-Min Goo
    • 1
  • Tae-Won Kim
    • 1
  • Sun-Hwa Ha
    • 2
  • Kyoung-Whan Back
    • 3
  • Jung-Myung Bae
    • 4
  • Yong-Wook Shin
    • 1
  • Cheol-Ho Lee
    • 1
  • Mi-Jeong Ahn
    • 1
  • Shin-Woo Lee
    • 1
  1. 1.College of Life Science & Natural ResourcesJinJu National UniversityJinJuRepublic of Korea
  2. 2.National Institute of Agricultural BiotechnologyRDASuwonRepublic of Korea
  3. 3.Department of Molecular BiotechnologyChonnam National UniversityGwangjuRepublic of Korea
  4. 4.School of Life Sciences and BiotechnologyKorea UniversitySeoulRepublic of Korea