Soil texture and irrigation influence the transport and the development of Pasteuria penetrans, a bacterial parasite of root-knot nematodes
- 作者：Dabiré ; K.R. ; Mateille ; T.
- 关键词：Clay ; Meloidogyne javanica ; Pasteuria penetrans ; Percolation ; Soil texture
- 刊名：Soil Biology & Biochemistry
- 出版年：2004
- 期刊代码：96_00380717
- 类别：abs
- 出版时间：March, 2004
- 卷：36
- 期：3
- 页码：539-543
- 文件大小：93.5 K
摘要
The transport of the spores of Pasteuria penetrans was studied in three contrasted textured soils (a sandy, a sandy-clay and a clay soils), cultivated with tomato, inoculated with juveniles of Meloidogyne javanica and watered with 25 or 150mmday−1. One month after inoculation of the nematodes, 53%of the spores inoculated were leached by water flow in the sandy soil but only 14%in the sandy-clay soil and 0.1%in the clay soil. No nematodes survived in the clay soil, while the population was multiplied both in the sandy and in the sandy-clay soils. But juveniles of M. javanica were more infected by P. penetrans in the sandy-clay soil than in the sandy soil. Comparing different combinations of bare soils containing 1.1–57%of clay showed that the best spore percolation and retention balance occurred in soils amended with 10–30%clay. However, the spore recoveries decreased when the soil was enriched with more than 30%clay. The role of clay particles on the extractability of spores and on their availability to attach to the nematode cuticle in the soil is discussed.