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http://dx.doi.org/10.5010/JPB.2017.44.4.438

Development of a marker system to discern the flowering type in Brassica rapa crops  

Kim, Jin A (National Academy of Agricultural Science, Rural Development Administration)
Kim, Jung Sun (National Academy of Agricultural Science, Rural Development Administration)
Hong, Joon Ki (National Academy of Agricultural Science, Rural Development Administration)
Lee, Yeon-Hee (National Academy of Agricultural Science, Rural Development Administration)
Lee, Soo In (National Academy of Agricultural Science, Rural Development Administration)
Jeong, Mi-Jeong (National Academy of Agricultural Science, Rural Development Administration)
Publication Information
Journal of Plant Biotechnology / v.44, no.4, 2017 , pp. 438-447 More about this Journal
Abstract
Flowering is one of the most important development traits related to the production of Brassica rapa crops. After planting, a sudden low temperature triggers premature flowering, which leads to a reduction in the yield and quality of harvested production. Therefore, understanding the mechanism of flowering control is important in the agricultural productivity for preventing Brassica rapa crops. Vernalization is generally known as the main factor of flowering in the Brassica plant. However, in the subspecies of Brassica rapa, some accession such as Yellow sarson and Komatsuna display the flowering phenotype without vernalization. Circadian genes, which diurnally regulate plant physiology, have a role for photoperiodic flowering but are related to the regulation of the vernalizarion mechanism. In this report, the 22 B. rapa accession were divided into two groups, vernalization and non-vernalization, and the sequenced circadian gene, BrPRR1s. Among them, the BrPRR1b gene was found to have deletion regions, which could classify the two groups. The PCR primer was designed to amplify a short band of 422bp in the vernalization type and a long band of 451bp in the non-vernalization type. This primer set was applied to distinguish the flowering types in the 43 B. rapa accession and 4 Brassica genus crop, Broccoli, cabbage, mustard, and rape. The PCR analysis results and flowering time information of each crop demonstrated that the primer set can be used as marker to discern the flowering type in Brassica crops. This marker system can be applied to the B. rapa breeding when selecting the flowering character of new progenies or introducing varieties at an early stage. In addition, these results displayed that the circadian clock genes can be a good strategy for the flowering control of B. rapa crops.
Keywords
Brassica rapa accession; BrPRR1; Circardian clock genes; Molecular marker; Vernalization;
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