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《Food Science》 2015-23
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Relationships between Nitrate Contents and NO_3~-/NH_4~+ Ratio or Key Enzymes of Nitrogen Metabolism in Bok Choy(Brassica rapa var. chinensis)

CHI Sunlin;YANG Yun;XU Weihong;CHEN Xugen;CHEN Yongqin;XIE Wenwen;XIONG Shijuan;WANG Zhengyin;XIE Deti;College of Resources and Environmental Sciences,Southwest University;  
Solution culture experiments were carried to explore the relationships between nitrate contents,parameters relevant to photosynthesis and key enzymes involved in nitrogen metabolism in ten bok choy varieties(Brassica chinensis L.)by setting NO_3~-/NH_4~+ratio as 50:50,75:25 and 100:0.The results showed that six out of ten bok choy varieties investigated indicated an increase in total dry weight respectively by 12.66%76.88%and 17.98%95.07%at NO_3~-/NH_4~+ ratio of 75:25and 100:0 compared with that at NO_3~-/NH_4~+ ratio of 50:50,though total dry weight of the Tianjin and Datouqmgjiang varieties decreased firstly and then increased whereas the Xianggang Chunxiu Tianbaicai 236 and Zhengwangda 88 varieties exhibited an initial increase followed by a decrease with increasing NO_3~-/NH_4~+ ratio.Nitrate contents of leaves and roots of bok choy rose,while those of petiole increased initially and then decreased.Moreover,the decreasing order of nitrate contents was petiole(3 882.62-5 448.81 mg/kg) leaf(2 004.86-4 146.50 mg/kg) root(505.39-2 188.68 mg/kg).Increasing NO_3~-/NH_4~+ ratio could result in an increase in nitrate contents of leaves and roots of most bok choy varieties and an initial increase and then decrease in petiole.Significantly negative correlation was observed between nitrate reductase(NR)and nitrate content in leaves of bok choy,while there was significantly positive correlation between nitrite reductase(NiR)and glutamine synthetase(GS).Nitrate content of bok choy leaves decreased with an increase in net photosynthetic rate(Pn)and intercellular CO_2 concentration(Ci),while enhancing along with an increase in transpiration(Tr).
【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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