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Fine mapping and characterisation of a PV-PUR mediating anthocyanin synthesis in snap bean (Phaseolus vulgaris L.)

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Abstract

Anthocyanin makes snap bean (Phaseolus vulgaris L.) pods purple, which helps seed dispersal and protects against environmental stress. In this study, we characterised the snap bean purple mutant pv-pur, which has purple cotyledon, hypocotyl, stem, leaf vein, flower and pod tissues. Total anthocyanin, delphinidin and malvidin levels in mutant pods were significantly higher than in wild-type plants. We constructed two populations for fine mapping of the PV-PUR purple mutation gene, located in the 243.9-kb region of chromosome 06. We identified Phvul.006g018800.3, encoding F3’5’H, as a candidate gene for PV-PUR. Six single-base mutations occurred in the coding region of this gene, altering protein structure. PV-PUR and pv-pur genes were transferred into Arabidopsis, respectively. Compared with the wild-type, the leaf base and internode of T-PV-PUR plant were purple, and the phenotype of T-pv-pur plant remained unchanged, which verified the function of the mutant gene. The results demonstrated that PV-PUR is a crucial gene for anthocyanin biosynthesis in snap bean, resulting in purple colouration. The findings lay a foundation for future breeding and improvement of snap bean.

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All data and materials generated or analysed during this study are included in this article and its supplementary information files.

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Funding

This work was supported by the National Natural Science Foundation of China (grant number 32002031); the Basic Scientific Research Operating Expenses of Provincial College in Heilongjiang Province, China (grant numbers 2020-KYYWF-1026 and 2020-KYYWF-1027); and the Heilongjiang Provincial Natural Science Foundation of China (grant number LH2020C090).

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CL and XY conceived, designed and performed the experiments and wrote the manuscript; YH and QC conducted partial gene mapping experiments; YH participated in the transgenic Arabidopsis experiments; ZY contributed to the experimental materials and field planting; DL and GF revised the manuscript and performed data analysis. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Dajun Liu or Guojun Feng.

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Liu, C., Yang, X., He, Y. et al. Fine mapping and characterisation of a PV-PUR mediating anthocyanin synthesis in snap bean (Phaseolus vulgaris L.). Mol Breeding 43, 15 (2023). https://doi.org/10.1007/s11032-023-01362-8

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  • DOI: https://doi.org/10.1007/s11032-023-01362-8

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