Effects of a plant parasitic nematode (Heterodera trifolii) on clover roots and soil microbial communities |
| |
Authors: | Amy M Treonis Roger Cook Lorna Dawson Susan J Grayston Tony Mizen |
| |
Institution: | (1) The Macaulay Institute, Craigiebuckler, Aberdeen, AB24 3NJ, UK;(2) Institute for Grassland and Environmental Research, Aberystwyth Research Station, Aberystwyth, SY23 3EB, UK;(3) Present address: Department of Biology, University of Richmond, 28 Westhampton Way, Richmond, VA 23173, USA;(4) Present address: Department of Forest Sciences, University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada , V6T 1Z4 |
| |
Abstract: | We studied the effects of the root endoparasitic nematode Heterodera trifolii on rhizodeposition and the root architecture of white clover (Trifolium repens). Rhizosphere solutions were collected from the root systems of plants growing with and without H. trifolii (200 juveniles per inoculated plant) in sand-based microlysimeters. The organic carbon (C) content of these solutions was
analyzed, and they were applied to plant-free soils to investigate microbial responses. Although plant biomass was unaffected
by nematodes, the architecture of the root systems was significantly altered, with a decrease in overall root length and an
increase in the density of lateral branches from the primary root. The presence of nematodes reduced the concentration of
organic compounds in the rhizosphere solutions but only on the final sampling date (75 days). Analysis of microbial signature
phospholipid fatty acids revealed no change in the structure of the microbial communities in soils to which rhizosphere solutions
were applied. However, these microorganisms did respond with changes in substrate utilization patterns (community-level physiological
profiles). Microbes in soils that received rhizosphere solutions from the nematode-infected clover showed lower utilization
of most substrates but higher utilization of oligosugars. These responses appear to be related to changes in roots and rhizodeposition
associated with nematode infection of clover roots. The results of this study suggest that root herbivory can negatively impact
carbon-limited soil microbial communities via changes in root architecture that moderate rhizodeposition. |
| |
Keywords: | Belowground herbivory CLPPs PLFA Rhizodeposition Root architecture |
本文献已被 SpringerLink 等数据库收录! |
|