Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China.
Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China.
Sci Total Environ. 2020 Jun 1;719:137442. doi: 10.1016/j.scitotenv.2020.137442. Epub 2020 Feb 20.
Phenolic compounds constitute probably the largest group of plant secondary metabolites and have key roles in plant metabolism. Simulated nitrogen (N) deposition is important to agriculture and has considerable impacts on plant phenolic metabolism but a systematic understanding of such effects is lacking. We here synthesized results from 123 articles and evaluated the responses of plant biomass, in vivo N status, soluble sugar concentrations, carbon (C)/N ratios and multiple phenolic compounds to the simulated N deposition. This meta-analysis showed that the simulated N deposition significantly increased plant biomass and N content but reduced the concentrations of phenolic compounds in a dose-depended manner. This was linked to the suppression of phenolic generating phenylalanine ammonia_lyase activity and key associated gene expression by the simulated N deposition. Total phenolic concentrations were negatively related to biomass but were positively correlated with C/N and soluble sugar contents. Overall, our results indicated adverse effects of simulated N deposition on phenolic metabolism which could compromise key aspects of crop quality and are apparently hidden by positive effects on plant biomass. Our findings have significant ecological and biological implications for plant phenolic metabolism facing global N deposition.
酚类化合物可能构成了植物次生代谢物中最大的一组，并且在植物代谢中具有关键作用。模拟氮（N）沉积对农业很重要，并且对植物酚代谢有很大的影响，但对这种影响缺乏系统的理解。在这里，我们综合了 123 篇文章的结果，并评估了植物生物量、体内 N 状况、可溶性糖浓度、C/N 比和多种酚类化合物对模拟 N 沉积的响应。这项荟萃分析表明，模拟 N 沉积以剂量依赖的方式显著增加了植物生物量和 N 含量，但降低了酚类化合物的浓度。这与模拟 N 沉积抑制了酚类物质生成的苯丙氨酸解氨酶活性和关键相关基因的表达有关。总酚浓度与生物量呈负相关，但与 C/N 和可溶性糖含量呈正相关。总的来说，我们的研究结果表明，模拟 N 沉积对酚代谢有不利影响，这可能会损害作物质量的关键方面，而对植物生物量的积极影响则掩盖了这一点。我们的研究结果对全球 N 沉积下植物酚代谢具有重要的生态和生物学意义。
