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Bolting resistant breeding of Chinese cabbage. 1. Flower induction of late bolting variety without chilling treatment

Summary

When a local slow bolting variety ‘Osaka Shirona Bansei’ (Brassica rapa L. ssp. pekinensis, syn. B. campestris L. ssp. pekinensis) was grown in a phytotron (25°C, 16 hours day length without chilling treatment), one third of the plants bolted and flowered. In order to clarify the different flowering responses in the variety, a progeny line (FNC) of the flowering plants was chilled for 4 different periods (0, 22, 36 and 53 days) in a chamber of 2 ∼ 7°C, then transplanted to three different conditions, i.e. PHY: 25–20°C day and night temperatures, 16 hours day length, GHL: 10 ∼ 25°C, 16 hours day length with supplementary light and GHN: 10 ∼ 25°C, natural day length (10 ∼ 15 hours). In PHY, FNC bolted and flowered with almost the same leaf numbers in all 4 different chilling treatments. This means that FNC has very low sensitivity and no requirement to low temperature for its reproductive growth. In GHN (short day length), FNC bolted very slowly. Then the bolting and flowering of FNC were promoted by both long day length and high temperature. The newly found bolting characteristics of ‘Osaka Shirona Bansei’ could be applied to breed unique slow bolting Chinese cabbage (B. rapa L. ssp. pekinensis) which might be non-sensitive to low temperature and its bolting and flowering would be induced with the combination of long day length and high temperature. Using the unique variety, it might be also possible to establish a new cropping type of Chinese cabbage (late autumn sowing, spring harvest).

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Abbreviations

PHY:

Phytotron, long day and high temperature condition

GHL:

Greenhouse, long day and medium temperature condition

GHN:

Greenhouse, natural (short) day and medium temperature condition

FNC:

A progeny line of ‘Osaka Shirona Bansei’ which flowered with no chilling treatment

FC:

A progeny line of ‘Osaka Shirona Bansei’ which flowered with chilling treatment

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Yui, S., Yoshikawa, H. Bolting resistant breeding of Chinese cabbage. 1. Flower induction of late bolting variety without chilling treatment. Euphytica 52, 171–176 (1991). https://doi.org/10.1007/BF00029393

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  • DOI: https://doi.org/10.1007/BF00029393

Key words

  • Brassica rapa
  • Brassica campestris
  • Brassica pekinensis
  • Chinese cabbage
  • bolting
  • chilling treatment
  • day length