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园艺学报 ›› 2017, Vol. 44 ›› Issue (4): 768-777.doi: 10.16420/j.issn.0513-353x.2017-0002

• 研究报告 • 上一篇    下一篇

红蓝光质对番茄幼苗氮水平和代谢关键酶及基因表达的影响

王丽伟1,李 岩2,3,*,辛国凤2,魏 珉2,3,杨其长1,*,米庆华3,4   

  1. (1中国农业科学院农业环境与可持续发展研究所,北京 100081;2山东农业大学园艺科学与工程学院,山东泰安 271018;3农业部黄淮海设施农业工程科学观测实验站,山东泰安 271018;4山东农业大学发展规划处,山东泰安 271018)
  • 出版日期:2017-04-25 发布日期:2017-04-25

Effects of Red and Blue Light Quality on Nitrogen Levels,Activities and Gene Expression of Key Enzymes Involved in Nitrogen Metabolism from Leaves of Tomato Seedlings

WANG Liwei1,LI Yan2,3,*,XIN Guofeng2,WEI Min2,3,YANG Qichang1,*,and MI Qinghua3,4,   

  1. (1Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China;2College of Horticultural Science and Engineering,Shangdong Agricultural University,Tai’an,Shandong 271018,China;3Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region,Ministry of Agriculture,Tai’an,Shandong 271018,China;4Development and Planning Department,Shangdong Agricultural University,Tai’an,Shandong 271018,China)
  • Online:2017-04-25 Published:2017-04-25

摘要:

采用LED(发光二极管)精量调制光源,以番茄品种‘SV0313TG’为试材,设置红光、蓝光和红蓝(31)组合光处理,以白光处理为对照,测定番茄幼苗叶片中主要含氮物质(全氮、硝态氮、铵态氮、游离氨基酸、可溶性蛋白质)含量和氮代谢关键酶[硝酸还原酶(NR)、亚硝酸还原酶(NiR)、谷氨酰胺合成酶(GS)、谷氨酸脱氢酶(GDH)、天冬酰胺合成酶(AS)和谷氨酸合成酶(GOGAT)]活性及其基因表达。结果表明,红蓝组合光处理下硝态氮含量、NR和GDH活性及6种氮代谢关键酶的基因表达量显著高于对照和其他处理,可溶性蛋白含量明显高于红光和对照处理,但与蓝光处理无显著差异;与对照和其他处理相比,蓝光处理下铵态氮和游离氨基酸含量显著升高,NR、NiR、GS和GOGAT活性及NRNiRGS2FdGOGATLEAS1相对表达量显著高于对照;与对照相比,红光显著降低了全氮含量,NiR、GOGAT、GDH和AS活性及GDH1表达量均受到抑制。综上,与对照相比,红光处理降低了番茄幼苗叶片全氮含量和部分氮代谢酶活性;蓝光处理则提高了游离氨基酸和铵态氮含量;红蓝组合光能够提高氮代谢相关酶转录水平和部分关键酶活性,进而促进氮素吸收并向可溶性蛋白转化。可见,适宜比例的红蓝组合光可促进番茄幼苗氮的同化及转化氮的吸收,加速物质积累,进而促进番茄幼苗生长。

关键词: 番茄, 光质, 氮含量, 氮代谢, 氨基酸

Abstract:

The light-emitting-diode(LED)as precision modulation light sources were used in this study with 3 treatments comprised of red(R)light,blue(B)light and combination of red and blue light with proportion of 31(3R1B),white light as the control. The content of main nitrogenous substances including total nitrogen,nitrate nitrogen,ammonium nitrogen,free amino acids and soluble protein,activities and gene expression of key enzymes from nitrogen metabolism including nitrate reductase(NR),nitrite reductase(NiR),glutamine synthetase(GS),glutamate dehydrogenase(GDH),asparagine synthetase(AS)and glutamate synthase(GOGAT)in leaf of tomato seedlings with‘SV0313TG’as experiment material were determined. The results showed that the nitrate nitrogen content and activities of NR and GDH and gene expression levels of 6 key enzymes for nitrogen metabolism under treatment of 3R1B were significantly higher than those of other treatments and the control,and the soluble protein content was also higher under this treatment than that of red and white light. While no significant difference was found between this treatment and blue light. In addition,the content of ammonium nitrogen and free amino acids under blue light was significantly increased compared with those of other treatments and the control,and activities of NR,NiR,GS and GOGAT,as well as relative expression of NRNiRGS2FdGOGAT and LEAS1 were significantly higher than those of the control. Comparing with white light,red light significantly reduced the total nitrogen content,and activities of NiR,GOGAT,GDH and AS and expression of GDH1 were inhibited as well. In conclusion,in comparison with white light,the total nitrogen content and activities of some nitrogen metabolizing enzymes were reduced by red light. However,the content of free amino acids and ammonium nitrogen were enhanced by blue light. Combination of red and blue light could improve transcription levels of nitrogen metabolism-related enzymes and activities of some key enzymes in this pathway,thereby,promoting nitrogen absorption and converting into soluble protein. It is evidently that the combination of red and blue light with appropriate proportion could promote the nitrogen assimilation and the absorption of transformed nitrogen in tomato seedlings,accelerating substances accumulation,and then,stimulating the growth of tomato seedlings.

Key words: tomato, light quality, nitrogen content, nitrogen metabolism, amino acid

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