Pleurotus eryngii, an edible white-rot fungus, is cultivated widespread in Eurasia, northern Africa and China. It occupies the second position in the world mushroom market. Despites the importance, the small numbers of studies have been done. To promote the availability of P. eryngii, it is important to know the genome and organization of the fungus. In this study, the whole genome sequence of P5 monokaryon from P. eryngii KNR2312 strain was sequenced using Next Generation Sequencing (NGS) strategy. Identified 222 SSR markers based on newly known genome information and various type of markers used to construct the map consisted of 12 linkage groups (LGs) spanning 1047.8 cM. Using composite interval mapping, 71 quantitative trait loci (QTL)s were identified on 12 linkage groups (LG) for nine traits such as yield, quality, cap color and earliness in four different populations. Clusters of more than five QTLs for various traits were identified on three genomic regions on LG 1, 7, and 9. The largest cluster was identified on LG 1 in the range from 65.4 to 110.4 cM. We performed the genes prediction analysis responsible for yield in the LG1 genomic region with highest logarithm of the odd (LOD) scores The identified genes were involved in biomass degradation and synthesis and signal transduction. However, the region was wide to identifie the genes crucial role in important trait, we need to narrow down. To improve the resolution of QTL mapping, we enlarge the populations crossing with additional 205 monokaryons. Find mapping of QTLs will increases the accuracy and efficiency of interpret the genomic region and enhance the usefulness of genomic information. [Supported by a grant from the IPET (213007-05-1-SBI30), MIFAFF, Republic of Korea.]

Molecular markers were crucial role in understanding and using genomic information for marker-assisted breeding, mapping genes of interest and cloning genes. Among the molecular markers, Simple Sequence Repeat (SSR) has became increasingly important marker due to their co-dominant and high polymorphic nature and abundant distribution throughout the genome. Simple sequence repeats (SSR), also called “microsatellites” consist of tandemly repeated short DNA sequence motifs and have applied in various marker-based studies. SSRs were isolated and characterized from “Heuktari” and “Miso”, which are one of the major oyster mushroom cultivars in Korea by the genome sequencing and bioinformatic analysis. The genome sizes of “Heuktari” were 40.8 Mb and “Miso” were estimated to be 40.3 Mb, which were larger than the other P.ostreatus species (PC9 and PC10) and less than P.eryngii (KNR2312 P5). A total of 949 and 968 SSRs were found in the “Heuktari” and “Miso” genomes, respectively. A comparative analysis of five mushrooms including P.ostreatus var. florida (PC9 and PC15), P.eryngii, revealed that SSR numbers from “Heuktari” and “Miso” were the highest among them. Studied all mushrooms showed similar pattern of SSR distributions. Tri-, hexa- and octanucleotide motifs accounted for the top three fractions of all SSRs. This study are useful in understanding the P.ostreatus.[Supported by a grant from the IPET (213007-05-1-SBI30), MIFAFF, Republic of Korea.]