, 118:75 | Cite as

Identification and mapping of a quantitative trait locus controlling extreme late bolting in Chinese cabbage (Brassica rapa L. ssp. pekinensis syn. campestris L.) using bulked segregant analysis

  • Hidetoshi Ajisaka
  • Yasuhisa Kuginuki
  • Susumu Yui
  • Sueo Enomoto
  • Masashi Hirai


DNA markers linked to a locus controlling an extreme late bolting trait, which was originally found in a local cultivar of a non-heading leafy vegetable,‘Osaka Shirona Bansei’ (Brassica rapa L. ssp. pekinensis syn. campestris L.) were identified using bulked segregant analysis. A doubled haploid (DH) line, DH27, which is a progeny of ‘Osaka Shirona Bansei’, shows extreme late bolting, and bolts without vernalization. DH27 was crossed with a normal bolting DH line, G309. The plantlets of the parents, F1 and F2, were vernalized and then grown in a greenhouse. The bolting time of F2 plants showed a continuous distribution from 19 to 231 days after vernalization (DAV), suggesting the effects of a few major genes and polygenes. Possible linkage markers for this trait were screened by modified bulked segregant analysis (BSA). The BSA using four bulks suggested that a 530-bp RAPD band RA1255C was linked to a locus controlling the bolting trait. The RAPD band was cloned and used as a probe to detect RFLP. The fragment detected a single locus, BN007-1,the segregation of which in the F2 population matched that of RA1255C. Three other RAPDs were found to be linked to BN007-1. A quantitative trait locus(QTL) affecting the bolting time was detected around BN007-1 using MAPMAKER/QTL. Since the difference between bolting times of both the parental genotypes in the F2 was 138 days, these markers may be useful for a marker-assisted selection (MAS) in the breeding program for late bolting or bolting-resistant cultivars in B. rapa crops.

Brassica rapa L. syn. campestris L. bulked segregant analysis (BSA) DNA polymorphism flowering time late bolting quantitative trait locus (QTL) 


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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Hidetoshi Ajisaka
    • 1
  • Yasuhisa Kuginuki
    • 1
  • Susumu Yui
    • 1
  • Sueo Enomoto
    • 1
  • Masashi Hirai
    • 1
  1. 1.National Research Institute of VegetablesOrnamental Plants & Tea (NIVOT), Ano, AgeMieJapan

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