Topological Differences Between Big bluestem and Switchgrass

Roles of Mycorrhizas & Nematodes in the Movement of Nitrogen in Plants and Soil

Topological Differences Between Big bluestem and Switchgrass Sara KrznarichNorthern Arizona UniversityDr. Nancy Johnson

Research QuestionAre there differences in the topology and mycorrhizal responses of big bluestem (Andropogon geradii) and switchgrass (Panicum virgatum)?

Photo by Wikimedia Commonscommons.wikimedia.org16001200Search by imageFile:Prairie en Chine du nord.jpg5PurposeCompare plant adaptations to obtain nutrients

Photo by Wikimedia Commonscommons.wikimedia.org16001200Search by imageFile:Prairie en Chine du nord.jpg6Experimental DesignFactorial greenhouse experiment2 grass species: Big bluestem and Switchgrass2 mycorrhizal fungi: Gigaspora and Glomus

Photo by Nancy JohnsonExperimental set-up

Photo by Nancy JohnsonExperimental set-up

0 months4 monthsAnalysis: Computer SoftwareWinRhizoRoot topology analysis

JMPSurface areaRoot lengthSpecific root length (length/weight)Analysis: WinRhizo

Analysis: WinRhizo

Big bluestemSwitchgrassAnalysis: WinRhizo

SwitchgrassBig bluestemConclusionMycorrhizal treatment: unsuccessful

Surface area: not significantly different

Total root length and specific root length differed significantlyBig bluestem > Switchgrass

Different strategies for nutrient uptakeAcknowledgementsDr. Nancy Johnson

Northern Arizona University Space Grant Program

Arizona Space Grant Consortium

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