Categories of Resistance to Greenbug and Yellow Sugarcane Aphid (Hemiptera: Aphididae) in Three Tetraploid Switchgrass Populations
TLDR
These studies are the first attempt to analyze the categories of resistance in switchgrass and provide critical information for characterizing the biological mechanisms of resistance and improving the knowledge of the plant–insect interactions within this system.Abstract:
Switchgrass, Panicum virgatum L., has been targeted as a bioenergy feedstock. However, little is currently known of the mechanisms of insect resistance in this species. Here, two no-choice studies were performed to determine the categories (antibiosis and tolerance) and relative levels of resistance of three switchgrass populations (Kanlow–lowland ecotype, Summer–upland ecotype, and third generation derivatives between Kanlow × Summer plants, K×S) previously identified with differential levels of resistance to the greenbug, Schizaphis graminum (Rondani), and yellow sugarcane aphid, Sipha flava (Forbes). No-choice studies indicated that Kanlow possessed multi-species resistance, with high levels of antibiosis to both aphid species, based on aphid survival at 7 and 14 days after aphid introduction and cumulative aphid days, while K×S possessed low-to-moderate levels of antibiosis to S. flava. Further, functional plant loss indices based on plant height and biomass indicated that tolerance is an important category of resistance for Summer plants to S. graminum. These studies also indicated that Summer lacks both tolerance and antibiosis to S. flava, relative to the other switchgrasses tested, whereas K×S lack tolerance and antibiosis to S. graminum. These studies are the first attempt to analyze the categories of resistance in switchgrass and provide critical information for characterizing the biological mechanisms of resistance and improving our knowledge of the plant–insect interactions within this system.read more
Citations
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Journal ArticleDOI
Plant Tolerance: A Unique Approach to Control Hemipteran Pests.
TL;DR: In this review, results from studies on plant tolerance to hemipterans are summarized, and potential models to understand tolerance are presented.
Journal ArticleDOI
Transcriptional analysis of defense mechanisms in upland tetraploid switchgrass to greenbugs
Teresa Donze-Reiner,Nathan A. Palmer,Erin D. Scully,T. J. Prochaska,T. J. Prochaska,Kyle G. Koch,Tiffany Heng-Moss,Jeffrey D. Bradshaw,Paul Twigg,Keenan Amundsen,Scott E. Sattler,Gautam Sarath +11 more
TL;DR: Extensive remodeling of the plant transcriptome and the production of ROS and several defensive metabolites in an upland switchgrass cultivar were observed in response to GB feeding.
Journal ArticleDOI
Fall armyworm (Spodoptera frugiperda Smith) feeding elicits differential defense responses in upland and lowland switchgrass.
Nathan A. Palmer,Saumik Basu,Tiffany Heng-Moss,Jeffrey D. Bradshaw,Gautam Sarath,Gautam Sarath,Joe Louis +6 more
TL;DR: Global transcriptome analysis revealed a stronger response in Kanlow plant relative to Summer plants suggesting that enhanced biosynthesis or accumulation of antifeedants could have negatively impacted FAW larval mass gain on Kanlow plants relative toSummer plants.
References
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Journal ArticleDOI
The Biology and Agronomy of Switchgrass for Biofuels
David J. Parrish,John H. Fike +1 more
TL;DR: Switchgrass has potential as a renewable fuel source, but such use will likely require large infrastructural changes; and, even at maximum output, such systems could not provide the energy currently being derived from fossil fuels.
Journal ArticleDOI
Describing and Quantifying Growth Stages of Perennial Forage Grasses
Kenneth J. Moore,Lowell E. Moser,Kenneth P. Vogel,Steven S. Waller,Blaine Earl Johnson,Jeffrey F. Pedersen +5 more
TL;DR: A system for identifying and quantifying the stages of growth and development of perennial forage grasses was developed and a universal set of morphological descriptors for forage and range grasses and a continuous numerical index was developed.
Book
Grass Varieties in the United States
TL;DR: Varieties and Experimental Lines: Descriptions Appendix A: USDA Plant Hardiness Zone Map Land Resource Regions Map and Descriptions and Abbreviations used in Handbook.