Microbiology Program, The Pennsylvania State University, University Park, Pennsylvania 16802.
Appl Environ Microbiol. 1986 Oct;52(4):819-23. doi: 10.1128/aem.52.4.819-823.1986.
The existence of nonobligate bacterial predators of bacteria in soil has been previously reported. Several additional predators were isolated from soil and tested for predation in situ in soil by use of the indirect bacteriophage analysis technique. The trials were conducted with nutritionally poor and nutritionally enriched soil. Certain of the predators that were gram negative were found to attack a range of both gram-positive and gram-negative host cell species, including at least some of the other predator bacteria, both gram positive and gram negative. The attack occurred in both the nutritionally poor and rich soils, but in some instances it was somewhat depressed in the rich soil. This may be due to the nonobligate nature of the predation. The gram-positive predators attacked a relatively narrow range of prey species, and the attack occurred only in the nutritionally rich soil. In addition, the gram-positive predators were subject to attack by certain of the gram-negative predators. These gram-negative predators therefore appeared to play a dominant role in the control of bacterial numbers in soil.
先前已有报告表明土壤中存在非专性细菌捕食者。从土壤中分离出了几种额外的捕食者，并通过间接噬菌体分析技术在土壤中进行了现场捕食测试。这些试验是在营养贫瘠和营养丰富的土壤中进行的。某些革兰氏阴性捕食者被发现能够攻击一系列革兰氏阳性和革兰氏阴性宿主细胞物种，包括至少一些其他的革兰氏阳性和革兰氏阴性捕食细菌。攻击发生在营养贫瘠和丰富的土壤中，但在某些情况下，在丰富的土壤中有些抑制。这可能是由于捕食的非专性。革兰氏阳性捕食者攻击相对狭窄的猎物物种范围，并且攻击仅发生在营养丰富的土壤中。此外，革兰氏阳性捕食者受到某些革兰氏阴性捕食者的攻击。因此，这些革兰氏阴性捕食者似乎在控制土壤中细菌数量方面发挥了主导作用。
