Soil respiration induced by the D- and L-isomers of a range of amino acids
Soil respiration induced by the D- and L-isomers of a range of amino acids
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DOI：
10.1016/s0038-0717(97)00080-1
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发表时间：
1997-11-01
影响因子：
9.7
通讯作者：
Hopkins, DW
中科院分区：
文献类型：
--
作者：
O'Dowd, RW;Parsons, R;Hopkins, DW
用丙氨酸、谷氨酰胺、谷氨酸、组氨酸、蛋氨酸和色氨酸的d -和l -异构体在微生物生物量含量相似但qCO(2)（基础呼吸/生物量C）值和麦角甾醇（真菌的指示物）含量不同的两种土壤中测定了土壤产生CO2的速率。所使用的l -氨基酸包括所有主要结构基团的代表和一些在自然界中很少遇到的d -氨基酸。l -氨基酸SIRs总是大于d-氨基酸SIRs，并且在大多数情况下，在qCO(2)较低和真菌生物量较小的土壤中，l -氨基酸与d-氨基酸SIR的比值（L-to-D ratio）较大。氨基酸底物处理7d后，d -氨基酸SIR和l -氨基酸SIR的增强对链霉素的敏感性相同，对环己亚胺的敏感性较低。这些观察结果表明，d -和l -氨基酸SIRs之间的差异不是由于土壤中细菌和真菌比例的明显差异。1997爱思唯尔科学有限公司
The rates of CO2 production from soils amended with the D-and L-isomers of alanine, glutamine, glutamic acid, histidine, methionine and tryptophan have been determined in two soils with similar microbial biomass contents but contrasting qCO(2) (basal respiration/biomass C) values and ergosterol (indicator of fungi) contents. The L-amino acids used include representatives of all the main structural groups and some D-amino acids rarely encountered in nature. The L-amino acid SIRs were always greater than the D-amino acid SIRs, and in most cases the ratio of L-amino acid-to-D-amino acid SIR (L-to-D ratio) was greater for the soil with lower qCO(2) and smaller fungal biomass. The enhancements of both D-amino acid SIR and L-amino acid SIR following conditioning of the soils with the amino acid substrate for 7d were equally susceptible to streptomycin and less susceptible to cycloheximide. These observations indicate that the difference between D-and L-amino acid SIRs was not due to gross differences in the proportions of bacteria and fungi in the soils. (C) 1997 Elsevier Science Ltd.