根凝集素对根际微生物活性的影响。
Effect of root agglutinin on microbial activities in the rhizosphere.
机构信息
Department of Microbiology, Soochow University, Shih Lin, Taipei, Taiwan, Republic of China.
出版信息
Appl Environ Microbiol. 1988 Jul;54(7):1838-41. doi: 10.1128/aem.54.7.1838-1841.1988.
A total of 220 bacterial isolates were obtained from pea rhizosphere and nonrhizosphere samples. Of these samples, 100 isolates were chosen randomly to test for their agglutinative reaction against pea root exudate. The percentage of positive agglutination of bacteria isolated from the nonrhizosphere sample was significantly lower than that of bacteria isolated from the rhizosphere sample. Moreover, this agglutinative reaction could not be blocked either by treating the bacterial cells or root exudate with different carbohydrates before they were mixed or by boiling the root exudate first. Bacteria that could be agglutinated by pea root exudate followed the downward growth of the pea root through the soil profile. The greater abilities of such bacteria to colonize the pea rhizosphere were indicated by their higher rhizosphere-colonizing (rhizosphere/nonrhizosphere) ratios, whether the bacteria were added alone or together with nonagglutinating bacteria. However, bacteria did show different agglutinative reactions toward root exudates obtained from different plants.
从豌豆根际和非根际样本中总共获得了 220 株细菌分离株。从这些样本中随机选择了 100 株分离株，以测试它们对豌豆根分泌物的凝集反应。从非根际样本中分离出的细菌的阳性凝集率明显低于从根际样本中分离出的细菌。此外，在混合前用不同的碳水化合物处理细菌细胞或根分泌物，或者先煮沸根分泌物，都不能阻止这种凝集反应。能够被豌豆根分泌物凝集的细菌会随着豌豆根在土壤剖面上的向下生长而向下生长。通过添加单独或与非凝集细菌一起添加，这类细菌在豌豆根际的定殖能力更强，其根际定殖（根际/非根际）比率更高。然而，细菌对不同植物的根分泌物确实表现出不同的凝集反应。
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