Chemical components of root exudates from four urban greening tree species
[Objective] The variations in chemical compounds in root exudates from fourcommon greening tree species in southern China were studied to providedata and scientific basis for further research in selection of greening tree species and phytoremediation of contaminated environments.[Method] Chemical components oftotal carbon(TC)and total nitrogen(TN) inroot exudates offour urban greening tree species (Koelreuteria paniculata,Magnolia lilii flora,Cinnamomum camphora,and Osmanthus fragrans)were identified and analyzed using GC-MS.[Result] A total of 35 chemical components were found in root exudates of M.liliiflora,followed by O.fragrans (16),K.paniculata (15),and C.camphora (7).The types of chemical components from root exudates included alkane,phenol,olefin,aldehyde,ester,ketone,ether,furan,amidoxime,pyridine,carbazole,quinoline,organic acid,and amino acid with the highest contents of phenol,quinone and alkane.Specifically,the ratios of phenol and quinone in the total detected compounds from K.paniculata,M.liliiflora,C.camphora and O.fragranswere 20.22％,13.61％,41.94％ and 42.07 ％,respectively.The alkane contents were 56.65 ％,7.77 ％,37.29 ％ and 33.13 ％,respectively.Five common components in root exudates of all four studied tree species were eicosane,tricosane,2,2'-methylenebis[6-(1,1-dimethylethyl)-4-methyl-,Pyridine-3-carboxamide,oxime,N-(2-t rifluoromethylphenyl)-,and 2-Quinolinecarboxaldehyde,8-hydroxy-.Two components (Heneicosane and Tetracosane) were found in root exudates of K.paniculata,M.liliiflora and O.fragransand Z-14-Nonacosane was detected in root exudates of K.paniculata,C.camphora and O.fragrans.TC contentswere in the order of K.paniculata (28.78 mg/L)＞M.liliiflora(24.15 mg/L)＞O.fragrans(8.58 mg/L)＞C.camphora(7.98 mg/L)while TN contents were in the order of K.paniculata (6.65 mg/L)＞C.camphora (5.55 mg/L)＞M.liliiflora (0.98 mg/L)＞O.fragrans(0.76 mg/L).[Conclusion] There were differences in types and contents of root exudates from different tree species.
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