Construction of high-density genetic linkage map of <i>Pyropia</i> <i>yezoensis</i> (Bangiales, Rhodophyta) and identification of red color trait QTLs in the thalli -- Journal of Oceanology and Limnology,2021,39(3):1103-1117

	Cite this paper:
	Lu WANG, Kuipeng XU, Xianghai TANG, Junhao WANG, Fanna KONG, Yunxiang MAO. Construction of high-density genetic linkage map of Pyropia yezoensis (Bangiales, Rhodophyta) and identification of red color trait QTLs in the thalli[J]. Journal of Oceanology and Limnology, 2021, 39(3): 1103-1117

Construction of high-density genetic linkage map of Pyropia yezoensis (Bangiales, Rhodophyta) and identification of red color trait QTLs in the thalli

Lu WANG^1,3, Kuipeng XU¹, Xianghai TANG¹, Junhao WANG¹, Fanna KONG¹, Yunxiang MAO^2,3

1 Key Laboratory of Marine Genetics and Breeding(Ministry of Education), College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;
2 Key Laboratory of Utilization and Conservation of Tropical Marine Bioresource(Ministry of Education), College of Fisheries and Life Science, Hainan Tropical Ocean University, Sanya 572022, China;
3 Marine Biology and Biotechnology Laboratory, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266071, China

Abstract:

Pyropia yezoensis is an important macroalga because of its extensive global distribution and economic importance. Color is an important trait in the thalli of P. yezoensis, it is also an effective marker to identify the hybridization in genetic breeding. In this study, a high-density genetic linkage map was constructed based on high-throughput single nucleotide polymorphism (SNP) markers, and used for analyzing the quantitative trait loci (QTLs) of red color trait in the thalli of P. yezoensis. The conchospore undergoes meiosis to develop into an ordered tetrad, and each cell has a haploid phenotype and can grow into a single individual. Based on this theory, F1 haploid population was used as the mapping population. The map included 531 SNP markers, 394.57 cM long on average distance of 0.74 cM. Collinear analysis of the genetic linkage map and the physical map indicated that the coverage between the two maps was 79.42%. Furthermore, QTL mapping identified six QTLs for the chromosomal regions associated with the red color trait of the thalli. The value of phenotypic variance explained (PVE) by an individual QTL ranged from 4.71%-63.11%. And QTL qRed-1-1, with a PVE of 63.11%, was considered the major QTL. Thus, these data may provide a platform for gene and QTL fine mapping, and marker-assisted breeding in P. yezoensis in the future.

Key words: Pyropia yezoensis|high-density genetic linkage map|quantitative trait loci (QTL) mapping|F1 haploid population|red pigment variant

Received: 2020-05-04 Revised: 2020-06-29

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