African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6259

Full Length Research Paper

Identification and mapping QTLs of bolting time in purple cai-tai (Brassica rapa L. var. purpurea)

Xiao-Hui Deng
  • Xiao-Hui Deng
  • Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan 430064, People’s Republic of China.
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Qi-Jun Nie
  • Qi-Jun Nie
  • Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan 430064, People’s Republic of China.
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Zheng-meng Qiu
  • Zheng-meng Qiu
  • Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan 430064, People’s Republic of China.
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Cai-xia Gan
  • Cai-xia Gan
  • Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan 430064, People’s Republic of China.
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Lei Cui
  • Lei Cui
  • Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan 430064, People’s Republic of China.
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Feng-Juan Zhu
  • Feng-Juan Zhu
  • Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan 430064, People’s Republic of China.
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  •  Received: 26 June 2019
  •  Accepted: 15 January 2020
  •  Published: 29 February 2020

Abstract

Bolting time is a crucial agronomic trait for yield and quality in purple cai-tai (Brassica. rapa L. var. purpurea), but the genetic mechanism controlling the procedure remains unknown. In the present study, a double haploid (DH) population derived from two inbred lines of purple cai-tai 4-1 and 040-3 was constructed to identify the quantitative trait loci (QTLs) of bolting time. Genetic linkage map was performed by JoinMap version 3.0 using SSR, SRAP and ESTP molecular markers. A total of one hundred and thirty-eight molecular markers were integrated into ten linkage groups (LGs), which were anchored to the corresponding chromosome of the B. rapa reference genome. The genetic linkage map covers 1253.1 cM, with an average distance of 9.08 cM between two adjacent markers. Five quantitative trait loci (QTLs) were identified to control bolting time and explaining variations from 17.7 to 44.2%. The genetic results of bolting time will be useful for future breeding of late bolting in purple cai-tai.

Key words: Purple cai-tai (Brassica rapa L. var. purpurea), bolting time, quantitative trait loci (QTL).