中文摘要：

采用纸层析法与紫外分光光度法，对来源于禾本科植物的64株内生固氮菌产γ-氨基丁酸的特性进行分析鉴定．筛选到3株γ-氨基丁酸产量较高的内生固氮菌：Y28（0．754mg·mL^-1）、Y21（0．597mg·mL^-1）、W3（0．539mg·mL^-1）．菌株Y28的产量比国内同行研究者初筛选到的产γ-氨基丁酸菌的产量（0．55mg·mL^-1）都要高，兼具固氮活性，具有很高的研究及应用价值．

英文摘要：

The gama-aminobutyric acid production ability of sixty-four endophytic diazotrophs from Gramineae were tested by paper chromatography and ultraviolet spectrophotometer. Strains Y28, Y21 and W3 can produce the gama-aminobutyric acid （0. 754 ±0. 004）, （0. 597 ±0. 001 ） and （0. 539 ±0. 002） mg·mL^-1, respectively. Diazotrophic strain Y28 can produce the highest gama-aminobutyric acid than that of known description and may be potential application.