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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (4): 146-152.DOI: 10.11686/cyxb20140418

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Organic acid composition analysis of root exudation of Chinese milk vetch genotypes

LIN Xin-jian,LAN Zhong-ming,ZHANG Hui,WANG Fei,HE Chun-mei   

  1. Institute of Soil and Fertilizer,Fujian Academy of Agricultural Sciences Agricultural Resource and Environmental Centre,Fujian Academy of Agricultural Sciences,Fuzhou 350013,China
  • Received:2013-07-09 Online:2014-08-20 Published:2014-08-20

Abstract: A low soil phosphorus content is one of the most important limiting factors affecting crop growth. Root exudations of organic acids which can activate insoluble phosphate have an important effect on enhancing crop P nutrition. Nine Chinese milk vetch (Astragalus sinicus) species were selected as research objects using soil culture in-situ methods to collect root exudates (organic acids) and high performance liquid chromatography (HPLC) was used to measure organic acid compositions and contents. Chinese milk vetch root exudates contain oxalic acid,malic acid,lactic acid,acetic acid,and succinic acid. There were significant differences between species,but the coefficient of individual species had large variations. There were significant positive correlations between malic acid and biomass,and between succinic acid and biomass. Thus,to some extent,the amount of malic and succinic acid secretion could represent the level of Chinese milk vetch biomass. In addition,the correlation between the total amount of organic acids and biomass was significantly (P<0.05) positive. Therefore,the level of exudation of organic acids,malic and succinic acids in particular,has a significant impact on Chinese milk vetch plant growth and biomass.

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