Abstract
The rice white tip nematode (RWTN), Aphelenchoides besseyi and the chrysanthemum foliar nematode (CFN), Aphelenchoides ritzemabosi are migratory plant parasitic nematodes that infect the aboveground parts of plants. In this research, Arabidopsis thaliana was infected by RWTN and CFN under indoor aseptic cultivation, and the nematodes caused recognizable symptoms in the leaves. Furthermore, RWTN and CFN completed their life cycles and proliferated. Therefore, A. thaliana was identified as a new host of RWTN and CFN. The optimum inoculum concentration for RWTN and CFN was 100 nematodes/plantlet, and the optimum inoculum times were 21 and 24 days, respectively. For different RWTN populations, the pathogenicity and reproduction rates were different in the A. thaliana Col-0 ecotype and were positively correlated. The optimum A. thaliana ecotypes were Col-0 and WS, which were the most susceptible to RWTN and CFN, respectively. Additionally, RWTN was ectoparasitic and CFN was ecto- and endoparasitic in A. thaliana. The RWTN and CFN migrated from inoculated leaves to the entire plantlet, and the number of nematodes in different parts of A. thaliana was not correlated with distance from the inoculum point. This is a detailed study of the behavior and infection process of foliar nematodes on A. thaliana.
Highlights
The rice white tip nematode (RWTN), Aphelenchoides besseyi and the chrysanthemum foliar nematode (CFN), Aphelenchoides ritzemabosi are migratory plant parasitic nematodes that infect the aboveground parts of plants
After the leaves of A. thaliana Col-0 ecotype were inoculated with RWTN from Ab-S24 and Ab-XI populations and the CFN population for 10–21 days, more nematodes were extracted from A. thaliana than were added in the inoculum
A. thaliana was inoculated with RWTN and CFN under aseptic conditions, and these nematodes infected, completed life cycles and proliferated in A. thaliana; A. thaliana is a new suitable host for RWTN and CFN
Summary
The rice white tip nematode (RWTN), Aphelenchoides besseyi and the chrysanthemum foliar nematode (CFN), Aphelenchoides ritzemabosi are migratory plant parasitic nematodes that infect the aboveground parts of plants. The RWTN and CFN migrated from inoculated leaves to the entire plantlet, and the number of nematodes in different parts of A. thaliana was not correlated with distance from the inoculum point This is a detailed study of the behavior and infection process of foliar nematodes on A. thaliana. It had been reported that A. thaliana is a good host for several sedentary root-knot and cyst nematodes and two migratory nematodes, Pratylenchus penetrans and Radopholus similis which successfully infect and complete life cycles in A. thaliana under monoxenic conditions[11,15]. These nematodes are all endoparasites of underground parts of plants. The optimum inoculum conditions were determined, and a model system for the study of interactions between A. thaliana and two foliar nematodes was established
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