|
| Effects of Different Ratios of Exogenous Glycine, Nitrate and Ammonium on Growth and Quality of Pakchoi(Brassica chinensis L.) |
| Received:April 21, 2015 |
| View Full Text View/Add Comment Download reader |
| KeyWord:nitrogen concentration and form ratio;amino acid;biomass and quality;root morphology;partial sterile cultivation |
| Author Name | Affiliation | E-mail | | CAO Xiao-chuang | State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China | | | LI Xiao-yan | Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | ZHU Lian-feng | State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China | | | ZHANG Jun-hua | State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China | | | YU Sheng-miao | State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China | | | JIN Qian-yu | State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China | | | WU Liang-huan | Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | finm@zju.edu.cn |
|
| Hits: 2767 |
| Download times: 2572 |
| Abstract: |
| Plants not only absorb nitrate(NO3--N) and ammonium(NH4+-N), but also have the ability to take up intact amino acids, such as glycine(Gly-N). It has been known that exogenous nitrogen(N) form in fertilizers is a major factor determining the nitrate accumulation and nutritional quality of plant edible parts. However, the effects of applying different N form mixture on plant growth and nutritional quality are still poorly understood. In this study, the effects of different concentrations and forms of exogenous Gly-N, NO3--N, and NH4+-N on biomass, root morphology and nutritional quality of pakchoi(Brassica chinensis L.) were explored under partial sterile hydroponic cultivation condition. Results showed that the biomass and nutritional quality of pakchoi was significantly affected by the ratios of three N forms(P <0.05). The highest pakchoi biomass(94.5 mg·plant-1) was achieved in the treatment supplied with high Gly-N(2500 μmol·L-1), high NH4+-N(2500 μmol·L-1), and low NO3--N(250 μmol·L-1). The total root length, total root surface area, total root volume, and root activity followed a similar variation trend to the pakchoi biomass. Simultaneous applications of high Gly-N and low inorganic N resulted in the highest content of total soluble proteins, total free amino acids, and total soluble sugars in pakchoi plants(about 26.2 mg·g-1, 126 mg·kg-1, and 24.0 mg·kg-1, respectively). Accumulation of nitrate was significantly decreased by high Gly-N and low inorganic N treatments, compared with the high inorganic N treatments(P <0.05). It suggests that appropriate formula of N sources, particularly higher Gly-N while in lower NO3--N, can partly improve the nutritional quality of pakchoi under sterile hydroponic conditions. Our results shed light on nutritional quality improvement of vegetables by optimizing the composition of different N forms in protected vegetable cultivation. |
|
|
|
