Aphid-Responsive Defense Networks in Hybrid Switchgrass
Kyle G Koch1, Nathan A Palmer2,3, Teresa Donze-Reiner4
1Department of Entomology, University of Nebraska at Lincoln, Lincoln, NE, United States.
Frontiers in Plant Science
|August 28, 2020
Summary
Hybrid switchgrass (SxK) exhibits distinct hormonal and metabolic defense responses to greenbug (GB) and yellow sugarcane aphids (YSA). Understanding these aphid-induced plant defense networks, including key transcription factors, is crucial for developing resistant switchgrass varieties.
Area of Science:
- Plant science
- Molecular biology
- Agronomy
Background:
- Aphid herbivory triggers plant defense mechanisms influenced by host genetics.
- Switchgrass cultivars 'Summer' and 'Kanlow' show differential resistance to greenbug (GB) and yellow sugarcane aphids (YSA).
- Hybrid switchgrass (SxK) exhibits susceptibility to both aphid species, necessitating investigation into its defense pathways.
Purpose of the Study:
- To delineate the defense networks induced by aphid feeding in SxK switchgrass.
- To identify plant transcription factors (TFs) regulating these defense responses.
- To understand the interplay of metabolism and transcriptional changes during aphid herbivory in hybrid switchgrass.
Main Methods:
- Hormone and metabolite profiling.
- RNA-Seq analysis of plant transcriptomes.
- Gene co-expression network analysis to identify TF-regulated modules.
Main Results:
- Abscisic acid (ABA) levels increased in response to GB and YSA, with distinct temporal patterns.
- Jasmonic acid and salicylic acid levels were altered by aphid infestation.
- YSA infestation led to significant enrichment of flavonoids and upregulation of related biosynthesis genes.
- Aphid-specific and common defense-related gene co-expression modules were identified and linked to specific TFs.
Conclusions:
- Aphid feeding induces complex hormonal and metabolic reprogramming in SxK switchgrass.
- Specific transcription factors, including WRKYs, are likely regulators of these defense responses.
- These findings provide insights into the molecular mechanisms underlying hybrid switchgrass defense against multiple aphid species.
Related Concept Videos
02:26Defenses Against Pathogens and Herbivores
29.2K
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
29.2K
01:25Cell Signaling in Plants
6.0K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
6.0K