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Journal of Integrative Agriculture  2025, Vol. 24 Issue (6): 2155-2170    DOI: 10.1016/j.jia.2024.08.026
Horticulture Advanced Online Publication | Current Issue | Archive | Adv Search |
The circadian clock shapes diurnal gene expression patterns linked to glucose metabolic processes in Chinese cabbage
Shan Wang, Kailin Shi, Yufan Xiao, Wei Ma, Yiguo Hong, Daling Feng#, Jianjun Zhao#
State Key Laboratory of North China Crop Improvement and Regulation/Key Laboratory of Vegetable Germplasm Innovation and Utilization of Hebei/Ministry of Education of China–Hebei Province Joint Innovation Center for Efficient Green Vegetable Industry, College of Horticulture, Hebei Agricultural University, Baoding 071000, China
 Highlights 
The circadian clock broadly regulates gene expression in Chinese cabbage, with gene expression peaks occurring earlier in short-period lines compared to long-period lines.
Circadian-controlled alternative splicing was firstly identified in Chinese cabbage on a genome-wide scale, approximately 250 splicing events linked with circadian rhythm.
All diurnal cycling and rhythmic splicing genes were significantly enriched in glucose metabolic processes.
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摘要  

生物钟作为植物体内的内源计时系统,通过调控基因表达的节律性以及各种生理代谢过程,从而提高植物对环境变化的适应性和竞争力,以达到最优化生长。大白菜(Brassica rapa ssp.pekinensis)作为十字花科重要的蔬菜作物,具有重要的经济价值。因此,解析生物钟对昼夜节律基因的影响,对提高大白菜的农艺性状和产量具有重要的指导意义。本研究以2份短周期自交系(“SPcc-1”和“SPcc-2”)和2份长周期自交系(“LPcc-1”和“LPcc-2”)为试材,在20ºC持续光照条件下取样进行时序转录组测序分析,发现大白菜32.7~50.5%的基因表达受生物钟调控,且节律基因的表达峰在短周期材料中出现较早,在长周期材料中出现较晚。大约250个可变剪切事件呈昼夜节律变化,其中内含子保留为主要的可变剪切类型。节律剪切基因包括生物钟核心基因:LATE ELONGATED HYPOCOTYLBrLHY)、REVEILLE 2BrRVE2)和EARLY FLOWERING 3BrELF3)。经转录水平及转录后水平分析,生物钟广泛影响着光合作用、卡尔文循环和三羧酸循环等糖代谢相关基因的周期性表达。本研究明确了生物钟参与的主要代谢途径,有助于利用生物钟调控大白菜的生长发育。



Abstract  

The plant circadian clock temporally drives gene expression throughout the day and coordinates various physiological processes with diurnal environmental changes.  It is essential for conferring plant fitness and competitive advantages to survive and thrive under natural conditions through the circadian control of gene transcription.  Chinese cabbage (Brassica rapa ssp. pekinensis) is an economically important vegetable crop worldwide, although there is little information concerning its circadian clock system.  Here we found that gene expression patterns are affected by circadian oscillators at both the transcriptional and post-transcriptional levels in Chinese cabbage.  Time-course RNA-seq analyses were conducted on two short-period lines (SPcc-1 and SPcc-2) and two long-period lines (LPcc-1 and LPcc-2) under constant light.  The results showed that 32.7–50.5% of the genes were regulated by the circadian oscillator and the expression peaks of cycling genes appeared earlier in short-period lines than long-period lines.  In addition, approximately 250 splicing events exhibited circadian regulation, with intron retention (IR) accounting for a large proportion.  Rhythmically spliced genes included the clock genes LATE ELONGATED HYPOCOTYL (BrLHY), REVEILLE 2 (BrRVE2) and EARLY FLOWERING 3 (BrELF3).  We also found that the circadian oscillator could notably influence the diurnal expression patterns of genes that are associated with glucose metabolism via photosynthesis, the Calvin cycle and the tricarboxylic acid (TCA) cycle at both the transcriptional and post-transcriptional levels.  The collective results of this study demonstrate that circadian-regulated physiological processes contribute to Chinese cabbage growth and development.


Keywords:  circadian clock       transcriptomek        alternative splicingk        glucose metabolismsk        Chinese cabbage  
Received: 22 February 2024   Accepted: 17 June 2024 Online: 29 August 2024  
Fund: 

This work was supported by the Science and Technology Program of Hebei Province, China (236Z2903G) and the Innovative Research Group Project of Hebei Natural Science Foundation, China (C2024204246). 

About author:  Shan Wang, E-mail: 1542293753@qq.com; #Correspondence Daling Feng, E-mail: bjdalingfeng@163.com; Jianjun Zhao, E-mail: jjz1971@aliyun.com

Cite this article: 

Shan Wang, Kailin Shi, Yufan Xiao, Wei Ma, Yiguo Hong, Daling Feng, Jianjun Zhao. 2025. The circadian clock shapes diurnal gene expression patterns linked to glucose metabolic processes in Chinese cabbage. Journal of Integrative Agriculture, 24(6): 2155-2170.

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