| 氮素对不同大豆品种根系分泌物中有机酸的影响 |
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| 引用本文： | 张俊英,王敬国,许永利,李海港. 氮素对不同大豆品种根系分泌物中有机酸的影响[J]. 植物营养与肥料学报, 2007, 13(3): 398-403. DOI: 10.11674/zwyf.2007.0308 |
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| 作者姓名： | 张俊英 王敬国 许永利 李海港 |
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| 作者单位： | 1.中国农业大学资源与环境学院农业部植物营养与养分循环重点开放实验室教育部植物-土壤相互作用重点实验室;北京100094; |
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| 摘 要： | 采用室内溶液培养方法,分别研究了接种根瘤菌处理下,两种氮源和两种氮浓度对两个大豆品种根系分泌物中有机酸的影响。结果表明,合丰25号根系分泌的有机酸种类和数量无论苗期或花期,接种或不接种根瘤菌,均表现为硝态氮处理高于酰胺态氮处理,表明合丰25号大豆更喜硝态氮,硝态氮促进了有机酸的分泌。绥农10号在酰胺态氮下的有机酸种类和数量均高于硝态氮处理,表明其更喜酰胺态氮,酰胺态氮下根瘤菌的存在增加其根系分泌物中有机酸种类和数量。可见,大豆根系分泌物中有机酸的种类和数量因品种而异,因品种对氮源的喜好而变化;根瘤菌在不同程度上增强或减弱根系有机酸的分泌作用。柠檬酸受氮素供应浓度影响很大,当氮素供应浓度较低时,大豆根系分泌物中可检测到柠檬酸,供氮浓度升高则检测不到。
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| 关 键 词： | 氮素 根系分泌物 大豆 有机酸 |
| 文章编号： | 1008-505X（2007）03-0398-06 |
| 收稿时间： | 2006-01-24 |
| 修稿时间： | 2006-04-30 |
Effect of nitrogen on the species and contents of organic acids in root exudates of different soybean cultivars |
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| ZHANG Jun-ying,WANG Jing-guo,XU Yong-li,LI Hai-gang. Effect of nitrogen on the species and contents of organic acids in root exudates of different soybean cultivars[J]. Plant Nutrition and Fertilizer Science, 2007, 13(3): 398-403. DOI: 10.11674/zwyf.2007.0308 |
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| Authors: | ZHANG Jun-ying WANG Jing-guo XU Yong-li LI Hai-gang |
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| Affiliation: | 1.College of Resource and Environment Science;CAU;Key Laboratory of Plant Nutrition and Nutrient Cycling;MOA;Key Laboratory of Soil-Plant Interaction;MOE;Beijing 100094;China.2 College of Resource and Environment Science;Hebei Polytechnic University;Tangs |
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| Abstract: | The organic acids were detected in soybean root exudates in order to understand the effect of the two N formations and N concentration on root exudates under hydroponics culture.Two cultivars,HF25 and SN10,were chosen in this study.HF25 is a susceptible genotype for root rot,while SN10 is resistant one.Two nitrogen sources were CO(NH2)2 and Ca(NO3)2,and N levels were 2.0×10-3 and 5.0×10-3 mol/L.Rhizobium was inoculated in each N treatment with a comparison to the un-inoculation one.In this research,the organic acids in soybean root exudates were detected by HPLC at seedling stage and flowering stage.The results of seedling stage showed that rhizobium had a neglect effect on the species and concentration of organic acids in HF25 root exudates under CO(NH2)2 solution compared to noninoculation one.While the species of organic acids in Ca(NO3)2 solution with rhizobium became less.As for SN10,rhizobium decreased the species of organic acids in CO(NH2)2 solution,but no effect in Ca(NO3)2 solution.In flowering stage,rhizobium increased the organic acids in HF25 root exudates both in CO(NH2)2 and Ca(NO3)2 solutions.There were no significantly different in SN10 under the same conditions.The concentration of organic acids in both soybean genotypes root exudates at flowering stage was higher than that in seedling stage.Data also showed that the citric acid in root exudates disappeared as the concentration of Ca(NO3)2 in solution increased from 2.0×10-3 to 5.0×10-3 mol/L,which indicated that the citric acid exudation from root was influenced by nitrogen concentration.It can be concluded that organic acids exudation from soybean root was affected by N source,N concentration,rhizobium,and soybean genotype. |
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| Keywords: | nitrogen root exudates soybean organic acids |
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