文献类型： 外文期刊
作者： Li, Xiaorong 1 ; Li, Jianfeng 1 ; Zhang, Hongzhi 1 ; Wang, Lihong 1 ; Wang, Zhong 1 ; Zhang, Yueqiang 1 ; Fan, Zheru 1 ;
作者机构： 1.Xinjiang Acad Agr Sci, Inst Nucl & Biol Technol, Urumqi 830091, Peoples R China
2.Minist Agr, Key Lab Crop Ecophysiol & Farming Syst Desert Oas, Urumqi 830091, Peoples R China
关键词： Low light stress; Homeostasis; ROS; Shading; Transcriptome; Wheat
期刊名称：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY （ 影响因子：0.822； 五年影响因子：0.906 ）
ISSN： 1560-8530
年卷期： 2020 年 24 卷 2 期
页码：
收录情况： SCI
摘要： Wheat-based intercropping systems are widely applied by farmers to improve the land equivalent ratio. However, intercropping leads to shading of wheat and the grain yield might be decreased due to reduced photosynthetic rate and leaf area index. This study was conducted to investigate the changes on transcriptional profile of wheat leaves in response to different levels of shading. Winter wheat (Triticum aestivum L. 'Xindong 20) was planted under three shading levels, namely, no-shading (control), 25% shading, and 75% shading. The dry weight of wheat plants was determined at flowering and maturity periods. The photosynthetic rate of flag leaves was determined at flowering and filling stages. Flag leaves from each group were collected at the heading stage for RNA sequencing. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was used to validate the results of RNA sequencing. Wheat plants had longer growth period, decreased dry weight and photosynthetic rate of flag leaves under different levels of shading. A total of 12,597 and 28,349 differentially expressed genes (DEGs) were identified in 25% shading group and 75% shading group, respectively. Functional enrichment analyses suggested that upregulated genes in 25% shading group were mainly involved in regulating cell homeostasis, especially in redox homeostasis. The upregulated genes in the 75% shading group were involved in nitrogen compound metabolic process. In addition, the downregulated genes of the two groups were both enriched in phosphorus metabolic processes. A total of 2,015 unigenes were identified as transcription factors. Ten of 16 DEGs (At3g21620, ETR1, 1-SST, PSB28, HEMH, Os10g0493600, 6-FEH, CIN2, PORA, and CPX) involved in porphyrin and chlorophyll metabolism, photosynthesis, and galactose metabolism were successfully validated by qRT-PCR. In conclusion, these data, revealed transcriptional dynamics of wheat under different shading levels, will provide essential clues for deciphering the gene regulatory networks mediating the wheat response to shading, especially at heading stage. 2020 Friends Science Publishers
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