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Interrelationships between Root-nodule Bacteria, Plant-parasitic Nematodes and their Leguminous Host
Journal of Nematology
|March 28, 2009
Summary
Plant-parasitic nematodes Meloidogyne javanica and Heterodera trifolii do not hinder white clover nodule formation or nitrogen fixation efficiency. However, early nodule disintegration by M. javanica and stunting from H. trifolii impact plant nutrition.
Area of Science:
- Plant Pathology
- Agronomy
- Microbiology
Background:
- White clover (Trifolium repens) forms symbiotic nodules with Rhizobium trifolii for nitrogen fixation.
- Plant-parasitic nematodes can negatively impact root health and symbiotic relationships.
Purpose of the Study:
- To investigate the effects of Meloidogyne javanica and Heterodera trifolii on Rhizobium trifolii nodules in white clover.
- To assess the impact on nodule number, size, structure, and nitrogen-fixation efficiency.
Main Methods:
- White clover was inoculated with Rhizobium trifolii and subsequently infected with M. javanica or H. trifolii at different times.
- Nodule formation, size, structure, and plant total nitrogen content were analyzed.
Main Results:
- Nematode infection did not hinder nodule formation or size, nor did it impair nitrogen-fixation efficiency.
- M. javanica caused earlier nodule disintegration, impacting nitrogen supply.
- H. trifolii infection led to plant stunting and reduced total nitrogen.
Conclusions:
- While nematodes do not directly inhibit nodulation or nitrogen fixation efficiency, their presence can indirectly affect plant nutrition through root damage and premature nodule senescence.
- Nematode management is crucial for maintaining optimal plant growth and nitrogen status in white clover systems.
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