title: Insights from the Cold Transcriptome and Metabolome ofDendrobium officinale: Global Reprogramming of Metabolic and Gene Regulation Networks during Cold Acclimation.
abstract: Plant cold acclimation (CA) is a genetically complex phenomenon involving gene regulation and expression. Little is known about the cascading pattern of gene regulatroy network and the link between genes and metabolites during CA.Dendrobium officinale(DOKM) is an important medicinal and ornamental plant and hypersensitive to low temperature. Here, we used the large scale metabolomic and transcriptomic technologies to reveal the response to CA in DOKM seedlings based on the physiological profile analyses. Lowering temperature from 4 to -2°C resulted in significant increase (P< 0.01) in antioxidant activities and electrolyte leakage (EL) during 24 h. The fitness CA piont of 0°C and control (20°C) during 20 h were firstly obtained according to physiological analyses. Subsequently, massive transcriptome and metabolome reprogramming occurred during CA. The gene to metabolite network demonstrated that the CA associated processes are highly energy demanding through activating hydrolysis of sugars, amino acids catabolism and citrate cycle. The expression levels of 2,767 genes were significantly affected by CA, including 153-fold upregulation of CBF transcription factor, 56-fold upregulation of MAPKKK16 protein kinase. Moreover, the gene interaction and regulation network analysis revealed that the CA as an active process, was regulated at the transcriptional, post-transcriptional, translational and post-translational levels. Our findings highligted a comprehensive regulatory mechanism including cold signal transduction, transcriptional regulation, and gene expression, which contributes a deeper understanding of the highly complex regulatory program during CA in DOKM. Some marker genes identified in DOKM seedlings will allow us to understand the role of each individual during CA by further functional analyses.
authors.affiliation: Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural Sciences Wenzhou, China.
authors.forename: Zhi-Gang
authors.initials: ZG
authors.lastname: Wu
authors.affiliation: Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural Sciences Wenzhou, China.
authors.forename: Wu
authors.initials: W
authors.lastname: Jiang
authors.affiliation: Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural SciencesWenzhou, China; School of Applied Sciences, Health Innovations Research Institute, Royal Melbourne Institute of Technology University, MelbourneVIC, Australia.
authors.forename: Song-Lin
authors.initials: SL
authors.lastname: Chen
authors.affiliation: School of Applied Sciences, Health Innovations Research Institute, Royal Melbourne Institute of Technology University, Melbourne VIC, Australia.
authors.forename: Nitin
authors.initials: N
authors.lastname: Mantri
authors.affiliation: Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural Sciences Wenzhou, China.
authors.forename: Zheng-Ming
authors.initials: ZM
authors.lastname: Tao
authors.affiliation: Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural Sciences Wenzhou, China.
authors.forename: Cheng-Xi
authors.initials: CX
authors.lastname: Jiang
keywords: Cold acclimation; Dendrobium officinale; metabolic network; regulatory mechanism; signal transduction; transcriptome