Journal of Plant Research

, Volume 130, Issue 3, pp 539–550 | Cite as

A GLABRA1 ortholog on LG A9 controls trichome number in the Japanese leafy vegetables Mizuna and Mibuna (Brassica rapa L. subsp. nipposinica L. H. Bailey): evidence from QTL analysis

  • Yaichi Kawakatsu
  • Hokuto Nakayama
  • Kaori Kaminoyama
  • Kaori Igarashi
  • Masaki Yasugi
  • Hiroshi Kudoh
  • Atsushi J. Nagano
  • Kentaro Yano
  • Nakao Kubo
  • Seisuke Kimura
Regular Paper
First Online:
Received:
Accepted:

Abstract

Brassica rapa show a wide range of morphological variations. In particular, the leaf morphologies of the Japanese traditional leafy vegetables Mizuna and Mibuna (Brassica rapa L. subsp. nipposinica L. H. Bailey) are distinctly different, even though they are closely related cultivars that are easy to cross. In addition to the differences in the gross morphology of leaves, some cultivars of Mibuna (Kyo-nishiki) have many trichomes on its leaves, whereas Mizuna (Kyo-mizore) does not. To identify the genes responsible for the different number of trichomes, we performed a quantitative trait loci (QTL) analysis of Mizuna and Mibuna. To construct linkage maps for these cultivars, we used RNA-seq data to develop cleaved amplified polymorphic sequence (CAPS) markers. We also performed a restriction site-associated DNA sequencing (RAD-seq) analysis to detect single-nucleotide polymorphisms (SNPs). Two QTL analyses were performed in different years, and both analyses indicated that the largest effect was found on LG A9. Expression analyses showed that a gene homologous to GLABRA1 (GL1), a transcription factor implicated in trichome development in Arabidopsis thaliana, and the sequences 3′-flanking (downstream) of BrGL1, differed considerably between Mizuna (Kyo-mizore) and Mibuna (Kyo-nishiki). These results indicate that BrGL1 on LG A9 is one of the candidate genes responsible for the difference in trichome number between Mizuna and Mibuna. Detecting genes that are responsible for morphological variations allows us to better understand the breeding history of Mizuna and Mibuna.

Keywords

Brassica rapa QTL analysis Trichomes RAD-seq 
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Notes

Acknowledgements

We thank Drs. Ferjani Ali for taking Scanning Electron Microscope pictures and Takahiro Kawanabe and Kaoru O. Yoshiyama for helpful discussion throughout our study. This research was supported by a Grant-in-Aid for Scientific Research on Innovative Areas (JP16H01472) and MEXT-Supported Program for the Strategic Research Foundation at Private Universities (2015–2019: S1511023) from the Ministry of Education, Culture, Sports, Science & Technology of Japan to SK. This work was financially supported by grants-in-aid from the Japan Society for the Promotion of Science (KAKENHI Grant Numbers JP2287003 and JP24770047) and research grants from Kyoto Sangyo University to S.K, and the Sasakawa Scientific Research Grant from The Japan Science Society to Y.K.

Author contributions

YK, HN, NK, and SK conceived and designed the project. YK, KK, KI, MY, HK, AN, KY, and SK performed the experiments. YK, HN, AN, and SK wrote the paper.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10265_2017_917_MOESM1_ESM.pdf (9.4 mb)
Supplementary material 1 (PDF 9581 KB)

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Copyright information

© The Botanical Society of Japan and Springer Japan 2017

Authors and Affiliations

  • Yaichi Kawakatsu
    • 1
  • Hokuto Nakayama
    • 2
  • Kaori Kaminoyama
    • 1
  • Kaori Igarashi
    • 3
  • Masaki Yasugi
    • 4
  • Hiroshi Kudoh
    • 5
  • Atsushi J. Nagano
    • 5
    • 6
    • 7
  • Kentaro Yano
    • 3
  • Nakao Kubo
    • 8
  • Seisuke Kimura
    • 1
    • 9
  1. 1.Department of Bioresource and Environmental Sciences, Faculty of Life SciencesKyoto Sangyo UniversityKyotoJapan
  2. 2.Department of Plant BiologyUniversity of California DavisDavisUSA
  3. 3.Bioinformatics Laboratory, School of AgricultureMeiji UniversityKawasakiJapan
  4. 4.National Institute for Basic BiologyOkazakiJapan
  5. 5.Center for Ecological ResearchKyoto UniversityOtsuJapan
  6. 6.Department of Plant Life Science, Faculty of AgricultureRyukoku UniversityOtsuJapan
  7. 7.JST PRESTOKawaguchiJapan
  8. 8.Graduate School of Life and Environmental SciencesKyoto Prefectural UniversityKyotoJapan
  9. 9.Center for Ecological Evolutionary Developmental BiologyKyoto Sangyo UniversityKyotoJapan

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