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《Food Science》 2016-13
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Relationship between Nitrate Contents of Chinese Cabbage(Brassica chinensis L.) and Light Intensity or Key Enzymes of Nitrogen Metabolism

CHEN Yongqin;FENG Bo;XU Weihong;YANG Yun;CHI Sunlin;CHEN Xugen;WANG Zhengyin;XIE Deti;College of Resources and Environment, Southwest University;  
Pot experiment was carried to explore the relationships of nitrate contents with photosynthetic system parameters in two Chinese cabbage varieties(Brassica chinensis L.)(the low-nitrate variety ‘JN4' and the high-nitrate variety ‘HKTX') under different light intensities(3 000, 6 000 and 12 000 lx) as well as with the key enzymes of nitrogen metabolism in soil and plants. The results showed that the biomass of Chinese cabbage had an increasing trend with increasing light intensity. The dry weight of shoots of ‘HKTX' and ‘JN4' increased by 10.51%-28.09% under light intensities of 6 000 and 12 000 lx as compared with that under 3 000 lx. The nitrate contents in leaves of the two Chinese cabbage varieties decreased significantly with increasing light intensity. The nitrate contents in leaf blades and petioles of ‘HKTX' and ‘JN4' decreased respectively by 22.27%-43.32% and 8.21%-31.40% under 6 000 and 12 000 lx as compared with those under 3 000 lx. There were significantly negative correlations between nitrate content and either net photosynthetic rate(Pn) with correlation coefficients of-0.686 and-0.833(P 0.01) or nitrate reductase(NR) activity in leave blades with correlation coefficients of-0.719 and-0.696(P 0.05) for the varieties ‘HKTX' and ‘JN4', respectively. Significantly positive correlations existed between the content of nitrate in either leaf blades or petioles and NO3--N level in soil with correlation coefficients of 0.692, 0.726, 0.676 and 0.796 for ‘JN4' and ‘HKTX'(P 0.05), respectively. Moreover, significantly negative correlations were observed between soil NO3--N content and nitrate reductase activity with correlation coefficients of-0.826 and-0.832(P 0.01), respectively.
【Fund】: 国家现代农业(大宗蔬菜)产业技术体系建设专项(Nycytx-35-gw16);; “十一五”国家科技支撑计划项目(2007BAD87B10)
【CateGory Index】: S634.3
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