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Comparing systemic defence-related gene expression changes upon migratory and sedentary nematode attack in rice
1Department of Molecular Biotechnology, Ghent University (UGent), Ghent, Belgium.
Plant Biology (Stuttgart, Germany)
|December 23, 2011
Summary
Rice plants exhibit distinct defense responses to different nematode pathogens. Root knot nematodes suppress defense genes early, while migratory nematodes initially activate them before suppression.
Area of Science:
- Plant Pathology
- Molecular Plant-Microbe Interactions
- Plant Defense Mechanisms
Background:
- Plant defense relies on complex signaling pathways regulated by hormones.
- Rice is susceptible to various biotic and abiotic stressors, necessitating robust defense mechanisms.
- Nematodes, such as root knot nematodes (RKN) and migratory root rot nematodes, pose significant threats to rice cultivation.
Purpose of the Study:
- To investigate differential gene expression in rice systemic tissues in response to two distinct nematode pathogens.
- To compare the defense responses triggered by Meloidogyne graminicola (RKN) and Hirschmanniella oryzae (migratory nematode).
- To understand how different nematode lifestyles influence plant defense suppression.
Main Methods:
- Quantitative reverse transcription PCR (qRT-PCR) was used to analyze gene expression.
- Systemic tissues of rice plants were analyzed at different time points post-infection (dpi).
- Expression levels of key defense-related genes, including isochorismate synthase, phenylpropanoid pathway, ethylene pathway, and PR genes, were quantified.
Main Results:
- Both nematode infections led to significantly lower expression of isochorismate synthase, crucial for salicylic acid production and basal defense.
- Migratory nematode infection induced a systemic defense response in rice shoots, up-regulating phenylpropanoid, ethylene, and PR genes by 3 dpi, with subsequent suppression by 7 dpi.
- RKN infection caused early and widespread suppression of defense gene expression in systemic shoot tissues by 3 dpi, notably affecting the ethylene pathway and methyl jasmonate biosynthesis.
Conclusions:
- Rice exhibits differential systemic defense responses to distinct nematode species.
- Nematodes possess mechanisms to suppress plant defense pathways, with RKN showing a more pronounced early suppression.
- These findings highlight the need for further research into nematode-induced defense suppression and its implications in multitrophic interactions.