Transcriptome analysis of genes involved in flower and leaf color of Oncidium by RNA-seq

Ma-Yin Wang

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
https://orcid.org/0009-0001-7707-9031

Yu Ding

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
https://orcid.org/0000-0001-7803-0806

Ye Zhang

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
https://orcid.org/0009-0000-2575-0025

Lu Sun

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
https://orcid.org/0009-0007-7062-8636

Xi-Qiang Song

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
https://orcid.org/0000-0001-7690-707X

Dai-Cheng Hao

Hainan Boda Orchid Technology Co. Ltd, Haikou 570311, China
https://orcid.org/0009-0001-6811-8334

Wei-Shi Li

Hainan Boda Orchid Technology Co. Ltd, Haikou 570311, China
https://orcid.org/0009-0009-9095-4732

Min-Qiang Tang

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China

Peng Ling

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China

Shang-Qian Xie

Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
https://orcid.org/0000-0002-8590-1814


Abstract

Oncidium, an important tropical orchid, has high ornamental value due to its specific color and occupies a significant market position for the worldwide flower. Transcriptome analysis of flower and leaf color formation provides new sources for producing novel Oncidium hybridum cultivars. We sequenced 12 samples of flowers (yellow and white) and leaves (striped and regular) of O. hybridum and assembled 381,136 and 453,566 unigene sequences from RNA-seq data, respectively. Among unigenes, 662 and 1,324 differentially expressed genes were identified in flower and leaf samples, respectively. Gene ontology and pathway enrichment showed that secondary metabolite biosynthetic pathways were responsible for flower and leaf color formation. It was determined that UGT75C1, E2.4.1.115, CCD7, E2.1.1.76, and CCoAOMT are involved in regulating flower color, and UGT75C1, LHCB, UGT, RP-L18Ae, and ABCB1 play crucial roles in regulating leaf color. Kyoto Encyclopedia of Genes and Genomes analysis revealed that UGT75C1 was significantly enriched in the anthocyanin biosynthetic pathway, showing effects on flower and leaf colors. This study was the first detailed analysis of the molecular mechanisms of O. hybridum flower and leaf colors, and the results advanced the understanding of the genetic basis of flower and leaf colors; they also provided additional support for improving commercial value and producing novel cultivars of O. hybridum.

Keywords:

Oncidium hybridum, RNA-seq, differential analysis, differentially expressed genes, key genes

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Ma-Yin Wang 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China https://orcid.org/0009-0001-7707-9031
Yu Ding 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China https://orcid.org/0000-0001-7803-0806
Ye Zhang 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China https://orcid.org/0009-0000-2575-0025
Lu Sun 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China https://orcid.org/0009-0007-7062-8636
Xi-Qiang Song 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China https://orcid.org/0000-0001-7690-707X
Dai-Cheng Hao 
Hainan Boda Orchid Technology Co. Ltd, Haikou 570311, China https://orcid.org/0009-0001-6811-8334
Wei-Shi Li 
Hainan Boda Orchid Technology Co. Ltd, Haikou 570311, China https://orcid.org/0009-0009-9095-4732
Min-Qiang Tang 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
Peng Ling 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China
Shang-Qian Xie 
Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, College of Horticulture, Hainan University, Haikou 570228, China https://orcid.org/0000-0002-8590-1814



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