摘要
采用土培实验研究不同品种小白菜（低富集硝酸盐小白菜品种＂揭农四号春白菜＂（JN4）、高富集硝酸盐小白菜品种＂香港特选奶白菜＂（HKTX））硝酸盐含量与光合系统参数及植物-土壤氮代谢关键酶的相关性。结果表明：随着光照度的增加,小白菜生物量总体呈增加趋势。与3 000 lx处理组相比较,光照度增加到6 000 lx和12 000 lx时,＂HKTX＂和＂JN4＂的地上部分干质量增加了10.51%~28.09%。随着光照度的增加,小白菜叶片硝酸盐含量显著降低。与3 000 lx处理组相比较,光照度增加到6 000 lx和12 000 lx时,＂HKTX＂和＂JN4＂的叶片硝酸盐含量降低了22.27%~43.32%,叶柄硝酸盐含量降低了8.21%~31.40%。两个供试品种小白菜叶片硝酸盐含量与净光合速率（Pn）成极显著负相关,相关系数分别为-0.686和-0.833（P〈0.01）;叶片硝酸还原酶活力与硝酸盐含量成显著负相关,相关系数分别为-0.719和-0.696（P〈0.05）;叶片、叶柄硝酸盐含量与土壤硝态氮含量成显著正相关,相关系数分别为0.692、0.726、0.676和0.796（P〈0.05）;土壤硝态氮含量与硝酸还原酶活性成极显著负相关,相关系数分别为-0.826和-0.832（P〈0.01）。
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.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2016年第13期183-188,共6页
Food Science
基金
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)
关键词
硝酸盐含量
光照度
氮代谢关键酶
相关性
小白菜品种
nitrate content
light intensity
key enzymes of nitrogen metabolism
correlation
Chinese cabbage varieties
作者简介
陈永勤（1992-）,女,硕士研究生,主要从事环境科学研究.E-mail：15023159641@163.com
通信作者：徐卫红（1969-）,女,教授,博士,主要从事植物营养与环境生态研究.E-mail：xuwei_hong@163.com
