The stem diameter, an important agronomic trait, affects cucumber growth and yield. However, no genes responsible for cucumber stem diameter have been identified yet. In this study, the stem diameter of 88 cucumber core germplasms were measured in spring 2020, autumn 2020 and autumn 2021, and a genome-wide association study (GWAS) was carried out based on the gene sequence and stem diameter of core germplasms. A total of eight loci (, , , , , , , and ) significantly associated with cucumber stem diameter were detected. Of these, five loci (, , , , and ) were repeatedly detected in two or more seasons and were considered as robust and reliable loci. Based on the linkage disequilibrium sequences of the associated SNP loci, 37 genes were selected. By further investigating the five loci via analyzing homologous genes and gene haplotypes, five genes (, , , , and ) showed variations in amino acid sequence between thick stem lines and thin stem lines. Expression pattern analyses of these genes also showed a significant difference between thick stem and thin stem lines. This study laid the foundation for gene cloning and molecular mechanism study of cucumber stem development.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9222855 | PMC |
| http://dx.doi.org/10.3390/genes13061095 | DOI Listing |
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