title: Transcriptome-based identification of genes revealed differential expression profiles and lignin accumulation during root development in cultivated and wild carrots.
abstract: Carrot root development associates lignin deposition and regulation. Carrot is consumed worldwide and is a good source of nutrients. However, excess lignin deposition may reduce the taste and quality of carrot root. Molecular mechanisms underlying lignin accumulation in carrot are still lacking. To address this problem, we collected taproots of wild and cultivated carrots at five developmental stages and analyzed the lignin content and characterized the lignin distribution using histochemical staining and autofluorescence microscopy. Genes involved in lignin biosynthesis were identified, and their expression profiles were determined. Results showed that lignin was mostly deposited in xylem vessels of carrot root. In addition, lignin content continuously decreased during root development, which was achieved possibly by reducing the expression of the genes involved in lignin biosynthesis. Carrot root may also prevent cell lignification to meet the demands of taproot growth. Our results will serve as reference for lignin biosynthesis in carrot and may also assist biologists to improve carrot quality.
authors.affiliation: State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Guang-Long
authors.initials: GL
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Xin-Yue
authors.initials: XY
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Zhi-Sheng
authors.initials: ZS
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China. xiongaisheng@njau.edu.cn.
authors.forename: Ai-Sheng
authors.initials: AS
authors.lastname: Xiong
mesh_terms: D053898:Biosynthetic Pathways / Q000235:genetics; D018552:Daucus carota / Q000235:genetics* / Q000254:growth & development; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008031:Lignin / Q000378:metabolism*; D008856:Microscopy, Fluorescence; D063245:Plant Development / Q000235:genetics; D018517:Plant Roots / Q000235:genetics* / Q000254:growth & development*; D059467:Transcriptome / Q000235:genetics*; D052584:Xylem / Q000378:metabolism
chemical_list: D008031:Lignin
keywords: Daucus carota L.; Gene regulation; Lignin; Root development; Transcriptome