Abstract
Fruit firmness is an important target of melon breeding, as it is associated with shelf life and economic value; however, the precise mechanism that determines fruit firmness during fruit ripening remains elusive. In the present study, one hundred forty-four F2 plants and F2–3 families derived from the high-firmness melon line M2–10 and the low-firmness melon line ZT091 were used to identify major quantitative trait loci by specific-locus amplified fragment sequencing with bulked segregant analysis. Simple sequence repeat (SSR) and cleaved amplified polymorphic sequence (CAPS) markers based on the resequencing of parental lines were also used to narrow the associated region to identify candidate genes. Two regions associated with fruit firmness were investigated, including a 4.87 Mb region on chr. 2 and a 28.7 Mb region on chr. 5 of the melon genome. SSR and CAPS markers were used to construct a genetic map of the associated regions: QTL ff5.1 was located between CmSSR13509 and CmSSR13423 and explained 38.44% of the observed variation, with an LOD threshold of 17.44; ff2.1 was located between CmSSR07709 and SNP22228 and explained 28.14% of the variation, with an LOD threshold of 3.8, and this region included 106 Kb and 10 candidate genes. Quantitative real-time PCR was performed to investigated the investigate candidate gene expression at 15, 20 and 25 days after pollination in the parental lines, and significant expression levels were detected for most of the genes, including four genes of unknown function and MELO3C017519, MELO3C017520, MELO3C017522, MELO3C029506, and MELO3C029520. These results revealed a new QTL, ff2.1, for melon fruit firmness-related gene identification.
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Acknowledgements
This study was supported by the National Natural Science Foundation of the People’s Republic of China (Nos. 31772330) and Natural Science Foundation of the Heilongjiang Province (Nos. LH2021C068) the Heilongjiang Bayi Agricultural University Support Program for San Zong (TDJH202004).
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YS designed this experiment. DD performed the research and wrote the manuscript. SZ and FL conducted data analysis. LW and PJ collected phenotypic data in field trials. HL gives specific modification opinions and constructive suggestion for submission. All co-authors reviewed and approved the manuscript before submission.
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Dai, D., Zeng, S., Wang, L. et al. Identification of fruit firmness QTL ff2.1 by SLAF-BSA and QTL mapping in melon. Euphytica 218, 52 (2022). https://doi.org/10.1007/s10681-022-02999-w
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DOI: https://doi.org/10.1007/s10681-022-02999-w