Kariuki G M, Dickson D W
Post Doctoral Research Scientist and Former Graduate Student, and Professor, Entomology and Nematology Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611-0620.
J Nematol. 2007 Mar;39(1):55-61.
Pasteuria penetrans isolate P-20 has been attributed as the cause of soil suppressiveness to peanut root-knot nematode in Florida. In this study, P. penetrans was transferred from a suppressive site to a new site and established by growing susceptible hosts to the peanut root-knot nematode during both summer and winter seasons. When two soil fumigants, 1,3-dichloropropene (1,3-D) and chloropicrin, were applied broadcast at the rate of 168 liters/ha and 263 kg/ha, respectively, the bacterium was not adversely affected by 1,3-D but was adversely affected by chloropicrin. In autumn 2005, after the harvest of the second peanut crop, the greatest number of J2 was recorded in the chloropicrin-treated plots, followed by the non-fumigated plots and 1,3-D-fumigated plots. The percentage J2 encumbered with endospores, endospores per J2 and percentage of P. penetrans-infected females were greatest in the non-fumigated plots, followed by 1,3-D- and chloropicrin-fumigated plots. This study demonstrates that P. penetrans can be transferred from a suppressive site to a new site and increased to suppressive densities against the peanut root-knot nematode.
巴氏杆菌Pasteuria penetrans分离株P - 20被认为是佛罗里达州土壤对花生根结线虫具有抑制作用的原因。在本研究中，P. penetrans从一个抑制性位点转移到一个新位点，并通过在夏季和冬季种植对花生根结线虫敏感的宿主来定殖。当分别以168升/公顷和263千克/公顷的用量播撒两种土壤熏蒸剂1,3 - 二氯丙烯（1,3 - D）和氯化苦时，该细菌不受1,3 - D的不利影响，但受到氯化苦的不利影响。2005年秋季，在第二季花生收获后，在氯化苦处理的地块中记录到的二龄幼虫数量最多，其次是非熏蒸地块和1,3 - D熏蒸地块。未被孢子包裹的二龄幼虫百分比、每个二龄幼虫的孢子数以及被P. penetrans感染的雌虫百分比在非熏蒸地块中最高，其次是1,3 - D和氯化苦熏蒸地块。本研究表明，P. penetrans可以从一个抑制性位点转移到一个新位点，并增加到对花生根结线虫具有抑制作用的密度。
