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Horticulturae
Volume 8
Issue 2
10.3390/horticulturae8020136
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Article

Identification and Comparative Analysis of Genes and MicroRNAs Involved in the Floral Transition of the Xinjiang Early-Flowering Walnut (Juglans regia L.)

by
Qiang Jin
1,2,3,
Rongli Mo
4,
Wenxing Chen
1,
Qinglin Zhang
1,
Fang Sheng
1,
Cuiyun Wu
2,3,
Rui Zhang
2,3 and
Zhengrong Luo
1,*
1
Key Laboratory of Horticultural Plant Biology, Huazhong Agricultural University, Wuhan 430070, China
2
College of Horticulture and Forestry, Tarim University, Alar 843300, China
3
Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Alar 843300, China
4
Institute of Economic Crops, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
*
Author to whom correspondence should be addressed.
Horticulturae 2022, 8(2), 136; https://doi.org/10.3390/horticulturae8020136
Submission received: 8 January 2022 / Revised: 2 February 2022 / Accepted: 3 February 2022 / Published: 5 February 2022
(This article belongs to the Collection Epigenetic Modifications and Breeding Application in Horticultural Plants)
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Abstract

For tree crops, shortening the juvenile phase is a vital strategy to advance fruit bearing and enhance the breeding efficiency. Walnut (Juglans regia L.) seedlings usually take at least eight to 10 years to flower, but early-flowering (EF) types can flower one or two years after planting. In this study, RNA sequencing (RNA-Seq) and microRNA sequencing (miRNA-Seq) were used for a transcriptome-wide analysis of gene and miRNA expression in hybrids of the Xinjiang EF walnut variety ‘Xinwen 81’ and later-flowering (LF) walnut. Based on a high-quality chromosome-scale reference genome, a total of 3009 differentially expressed genes (DEGs) were identified, of which 933 were upregulated (accounting for 31%) and 2076 were downregulated (accounting for 69%). DEGs were functionally annotated, and the flowering-related genes FLOWERING LOCUS T (FT), SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1), and LEAFY (LFY) showed remarkable upregulation in EF compared with in the LF walnut. In addition, miRNAs associated with floral transition were screened as candidates for flowering time regulation in the walnut. This work provides new insights into walnut floral transition, which may ultimately contribute to genetic improvement of the walnut.
Keywords: Walnut; Juglans regia; Flowering time; RNA-Seq; MicroRNA-Seq; Floral transition Walnut; Juglans regia; Flowering time; RNA-Seq; MicroRNA-Seq; Floral transition
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MDPI and ACS Style

Jin, Q.; Mo, R.; Chen, W.; Zhang, Q.; Sheng, F.; Wu, C.; Zhang, R.; Luo, Z. Identification and Comparative Analysis of Genes and MicroRNAs Involved in the Floral Transition of the Xinjiang Early-Flowering Walnut (Juglans regia L.). Horticulturae 2022, 8, 136. https://doi.org/10.3390/horticulturae8020136

AMA Style

Jin Q, Mo R, Chen W, Zhang Q, Sheng F, Wu C, Zhang R, Luo Z. Identification and Comparative Analysis of Genes and MicroRNAs Involved in the Floral Transition of the Xinjiang Early-Flowering Walnut (Juglans regia L.). Horticulturae. 2022; 8(2):136. https://doi.org/10.3390/horticulturae8020136

Chicago/Turabian Style

Jin, Qiang, Rongli Mo, Wenxing Chen, Qinglin Zhang, Fang Sheng, Cuiyun Wu, Rui Zhang, and Zhengrong Luo. 2022. "Identification and Comparative Analysis of Genes and MicroRNAs Involved in the Floral Transition of the Xinjiang Early-Flowering Walnut (Juglans regia L.)" Horticulturae 8, no. 2: 136. https://doi.org/10.3390/horticulturae8020136

APA Style

Jin, Q., Mo, R., Chen, W., Zhang, Q., Sheng, F., Wu, C., Zhang, R., & Luo, Z. (2022). Identification and Comparative Analysis of Genes and MicroRNAs Involved in the Floral Transition of the Xinjiang Early-Flowering Walnut (Juglans regia L.). Horticulturae, 8(2), 136. https://doi.org/10.3390/horticulturae8020136

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