Development of late-bolting F1 hybrids of Chinese cabbage (Brassica rapa L.) allowing early spring cultivation without heating
We developed new F 1 hybrids of Chinese cabbage ( Brassica rapa L. ssp. pekinensis ) that allow cultivation earlier in spring without heating by introducing extremely late-bolting alleles at two homologs of the flowering repressor Flowering Locus C ( BrFLC2 and BrFLC3 ) from non-heading ‘Leafy Green...
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Published in | Euphytica Vol. 213; no. 12; pp. 1 - 13 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.12.2017
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | We developed new F
1
hybrids of Chinese cabbage (
Brassica rapa
L. ssp.
pekinensis
) that allow cultivation earlier in spring without heating by introducing extremely late-bolting alleles at two homologs of the flowering repressor
Flowering Locus C
(
BrFLC2
and
BrFLC3
) from non-heading ‘Leafy Green Parental Line No. 2’. These new F
1
hybrids were produced by the following four steps. First, the extremely late bolting selected lines were developed. These selected lines headed in spring after overwintering cultivation, whereas the conventional F
1
cultivars flowered. Secondly, an investigation of the three plantings showed that our F
1
hybrids formed heads when seeds were sown from mid-February to early March, whereas the conventional F
1
cultivar did not form heads because of premature bolting. Thirdly, we identified some F
1
hybrids with extremely late bolting during early spring cultivation in an investigation of many F
1
hybrids. Finally, based on an investigation across four cold regions for 2 years, we compared the commercialization rate, defined as the proportion of plants greater than 2000 g in weight and with a flowering stalk less than 10 cm long. Then we identified a F
1
of MS02 × 12-04 which had a high commercialization rate on average (92%), whereas the rates of three conventional F
1
cultivars were only 0–2%. In the near future, these F
1
hybrids will be valuable late-bolting cultivars despite climate change, permitting stable cultivation and harvest over wide regions. |
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ISSN: | 0014-2336 1573-5060 |
DOI: | 10.1007/s10681-017-2079-x |