| 增铵营养对番茄幼苗生长和有机酸含量的影响 |
| |
| 作者姓名： | DONG Cai-Xi SHEN Qi-Rong WANG Ge |
| |
| 作者单位： | [2]CollegeofResourcesandEnvironmentalSciences,NanjingAgriculturalUniversity,Nanjing210095（China）／E-mail：cxdong@njau.edu.cn |
| |
| 基金项目： | *1Project supported by the National Natural Science Foundation of China (No.30270790) and National Post-doctoral Foundation of China (No.2003033494). |
| |
| 摘 要： | A hydroponic experiment was conducted to study the effect of partial replacement of NO(3^-)-N by NH -N on theseedling growth and organic acid content of tomato (Lycopersicon esculentum Mill.). A completely randomized designwas established with three replications and five treatments, i.e., NO(3^-)-N/NH(4^ )-N of 100/0, 75/25, 50/50, 25/75 and0/100. Results showed that 25% replacement of NO(3^-)-N by NH(4^ )-N significantly (P = 0.05) improved fresh and dryweight, revealing that a proper percentage of NH -N was important for tomato nitrogen nutrition. This could increasethe plant growth even though tomato was a crop that preferred nitrate nutrition. Also an increase in the proportion ofNH -N in the nutrient solution led to a significant decrease (P=0.05) in malate, citrate and fumarate. However, the25% NH(4^ )-N plus 75% NO(3^-)-N treatment had no significant effect (P = 0.05) on the 2-ketoglutarate, succinate or oxalicacid content, showing that only some organic acids in tomato plants were affected. Only pyruvate increased significantly(P=0.05), and it only increased for 25% and 50% replacement of NO(3^-)-N by NH(4^ )-N. Metabolism of these organicacids, especially malate, citrate and fumarate, should be further studied at the molecular level in vegetables applied withdifferent nitrogen forms.
|
| 关 键 词： | 西红柿 生长 有机酸 离子化合物 溶液培养实验 |
Tomato growth and organic acid changes in response to partial replacement of NO3--N by NH4+-N |
| |
| DONG Cai-Xi,SHEN Qi-Rong,WANG Ge.Tomato growth and organic acid changes in response to partial replacement of NO3--N by NH4+-N[J].Pedosphere,2004,14(2):159-164. |
| |
| Authors: | DONG Cai-Xi SHEN Qi-Rong and WANG Ge |
| |
| Institution: | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China). E-mail: cxdong@njau.deu.cn;College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China). E-mail: cxdong@njau.deu.cn;College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China). E-mail: cxdong@njau.deu.cn |
| |
| Abstract: | A hydroponic experiment was conducted to study the effect of partial replacement of NO(3^-)-N by NH -N on theseedling growth and organic acid content of tomato (Lycopersicon esculentum Mill.). A completely randomized designwas established with three replications and five treatments, i.e., NO(3^-)-N/NH(4^ )-N of 100/0, 75/25, 50/50, 25/75 and0/100. Results showed that 25% replacement of NO(3^-)-N by NH(4^ )-N significantly (P = 0.05) improved fresh and dryweight, revealing that a proper percentage of NH -N was important for tomato nitrogen nutrition. This could increasethe plant growth even though tomato was a crop that preferred nitrate nutrition. Also an increase in the proportion ofNH -N in the nutrient solution led to a significant decrease (P=0.05) in malate, citrate and fumarate. However, the25% NH(4^ )-N plus 75% NO(3^-)-N treatment had no significant effect (P = 0.05) on the 2-ketoglutarate, succinate or oxalicacid content, showing that only some organic acids in tomato plants were affected. Only pyruvate increased significantly(P=0.05), and it only increased for 25% and 50% replacement of NO(3^-)-N by NH(4^ )-N. Metabolism of these organicacids, especially malate, citrate and fumarate, should be further studied at the molecular level in vegetables applied withdifferent nitrogen forms. |
| |
| Keywords: | NH4+-N nitrogen forms NO3--N organic acid tomiato (Lycopersicon esculentum Mill ) |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《土壤圈》浏览原始摘要信息 |
| 点击此处可从《土壤圈》下载免费的PDF全文 |
|
