Abstract
Suitable flowering time can improve fiber yield and quality, which is of great significance for jute biological breeding. In this study, 242 jute accessions were planted in Fujian for 2 consecutive years, and 244,593 SNPs distributed in jute genome were used for genome-wide association analysis of flowering time. A total of 19 candidate intervals (P < 0.0001) were identified by using GLM and FaST-LMM and were significantly associated with flowering time, with phenotypic variation explained (PVE) ranging from 5.8 to 18.61%. Six stable intervals that were repeatedly detected in different environments were further identified by the linkage disequilibrium heatmap. The most likely 7 candidate genes involved to flowering time were further predicted according to the gene functional annotations. Notably, functional analysis of the candidate gene CcPRR7 of the major loci qFT-3–1, a key factor in circadian rhythm in the photoperiodic pathway, was evaluated by linkage, haplotype, and transgenic analysis. β-glucuronidase (GUS) and luciferase (LUC) activity assay of the promoters with two specific haplotypes confirmed that the flowering time can be controlled by regulating the expression of CcPRR7. The model of CcPRR7 involved in the photoperiod regulation pathway under different photoperiods was proposed. These findings provide insights into genetic loci and genes for molecular marker-assisted selection in jute and valuable information for genetically engineering PRR7 homologs in plants.
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Data availability
The genotype data of this study can be obtained from the National Genomics Data Center of China (PRJCA005722).
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Acknowledgements
We are grateful for the support of the platforms of the Key Laboratory of the Ministry of Agriculture and Rural Affairs for Biological Breeding of Fujian and Taiwan Crops, Fujian Public Platform for Germplasm Resources of Bast Fiber Crops, and Fujian International Science and Technology Cooperation Base for Genetic Breeding and Multiple Utilization Development of Southern Economic Crops.
Funding
This research was supported by the National Natural Science Foundation of China (31972968, 31771369) and the China Agriculture Research System of MOF and MARA (CARS-16).
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JY: conceptualization, data curation, formal analysis, writing—original draft. HL: data curation. SJ, ZQ, AT, PF, JX, LL, JQ: methodology, materials. LZ: supervision the work, funding acquisition, writing—review and editing.
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Yao, J., Jiang, S., Li, H. et al. Genome-wide association study reveals loci and candidate genes of flowering time in jute (Corchorus L.). Mol Breeding 43, 85 (2023). https://doi.org/10.1007/s11032-023-01435-8
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DOI: https://doi.org/10.1007/s11032-023-01435-8