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Open AccessArticle

Fine Mapping and Transcriptome Analysis Reveal Candidate Genes Associated with Hybrid Lethality in Cabbage (Brassica Oleracea)

Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, No. 12 Zhongguancun South Street, Beijing 100081, China
Authors to whom correspondence should be addressed.
Academic Editor: Aureliano Bombarely
Genes 2017, 8(6), 147;
Received: 4 April 2017 / Revised: 8 May 2017 / Accepted: 15 May 2017 / Published: 5 June 2017
(This article belongs to the Special Issue Evolution and Biodiversity of the Plant Genome Architecture)
Hybrid lethality is a deleterious phenotype that is vital to species evolution. We previously reported hybrid lethality in cabbage (Brassica oleracea) and performed preliminary mapping of related genes. In the present study, the fine mapping of hybrid lethal genes revealed that BoHL1 was located on chromosome C1 between BoHLTO124 and BoHLTO130, with an interval of 101 kb. BoHL2 was confirmed to be between insertion-deletion (InDels) markers HL234 and HL235 on C4, with a marker interval of 70 kb. Twenty-eight and nine annotated genes were found within the two intervals of BoHL1 and BoHL2, respectively. We also applied RNA-Seq to analyze hybrid lethality in cabbage. In the region of BoHL1, seven differentially expressed genes (DEGs) and five resistance (R)-related genes (two in common, i.e., Bo1g153320 and Bo1g153380) were found, whereas in the region of BoHL2, two DEGs and four R-related genes (two in common, i.e., Bo4g173780 and Bo4g173810) were found. Along with studies in which R genes were frequently involved in hybrid lethality in other plants, these interesting R-DEGs may be good candidates associated with hybrid lethality. We also used SNP/InDel analyses and quantitative real-time PCR to confirm the results. This work provides new insight into the mechanisms of hybrid lethality in cabbage. View Full-Text
Keywords: cabbage; hybrid lethality; fine mapping; transcriptome analysis cabbage; hybrid lethality; fine mapping; transcriptome analysis
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Xiao, Z.; Hu, Y.; Zhang, X.; Xue, Y.; Fang, Z.; Yang, L.; Zhang, Y.; Liu, Y.; Li, Z.; Liu, X.; Liu, Z.; Lv, H.; Zhuang, M. Fine Mapping and Transcriptome Analysis Reveal Candidate Genes Associated with Hybrid Lethality in Cabbage (Brassica Oleracea). Genes 2017, 8, 147.

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