Journal
THEORETICAL AND APPLIED GENETICS
Volume 133, Issue 4, Pages 1313-1319Publisher
SPRINGER
DOI: 10.1007/s00122-020-03552-w
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Funding
- National Key R&D Program of China [2018YFD0100500, 2018YFE0108000]
- National Nature Science Foundation of China [31971978]
- Project of Chongqing Science and Technology Commission [cstc2019jcyj-zdxm0012]
- Fundamental Research Funds for the Central Universities [XDJK2018AA004]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2017jcyjAX0107]
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Key message Resistant rapeseed lines pyramided with multiple resistant QTLs derived from Brassica oleracea were developed via a hexaploidy strategy. Rapeseed (Brassica napus L.) suffers heavily from Sclerotinia stem rot, but the breeding of Sclerotinia-resistant rapeseed cultivar has been unsuccessful. During the study, interspecific hexaploids were generated between rapeseed variety 'Zhongshuang 9' and a wild B. oleracea which was highly resistant to S. sclerotiorum, followed by backcrossing with Zhongshuang 9 and successive selfing. By molecular marker-assisted selection, three major resistant QTLs were transferred and pyramided from B. oleracea into two BC1F8 lines which exhibited similar to 35% higher resistance level than Zhongshuang 9 and produced good seed yield and seed quality. It is the first report on successful development of Sclerotinia-resistant rapeseed lines by introducing multiple resistant loci from wild B. oleracea. This study revealed the effectiveness of pyramiding multiple QTLs in improving Sclerotinia resistance in rapeseed and provided a novel breeding strategy on utilization of B. oleracea in rapeseed improvement.
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