Associative nitrogen fixation (ANF) in switchgrass (Panicum virgatum) across a nitrogen input gradient

PloS One
Sarah S RoleyG Philip Robertson


Associative N fixation (ANF), the process by which dinitrogen gas is converted to ammonia by bacteria in casual association with plants, has not been well-studied in temperate ecosystems. We examined the ANF potential of switchgrass (Panicum virgatum L.), a North American prairie grass whose productivity is often unresponsive to N fertilizer addition, via separate short-term 15N2 incubations of rhizosphere soils and excised roots four times during the growing season. Measurements occurred along N fertilization gradients at two sites with contrasting soil fertility (Wisconsin, USA Mollisols and Michigan, USA Alfisols). In general, we found that ANF potentials declined with long-term N addition, corresponding with increased soil N availability. Although we hypothesized that ANF potential would track plant N demand through the growing season, the highest root fixation rates occurred after plants senesced, suggesting that root diazotrophs exploit carbon (C) released during senescence, as C is translocated from aboveground tissues to roots for wintertime storage. Measured ANF potentials, coupled with mass balance calculations, suggest that ANF appears to be an important source of N to unfertilized switchgrass, and, by extension, to ...Continue Reading


Jan 1, 1980·Annual Review of Microbiology·R L Robson, J R Postgate
Aug 30, 2011·Ecology·Steven S Perakis, Emily R Sinkhorn
Jul 9, 2014·Ecology·Kendra K McLauchlanTroy W Ocheltree
Jul 9, 2014·Applied and Environmental Microbiology·Rahul A BahulikarMichael K Udvardi
Oct 16, 1998·Angewandte Chemie·Felix Tuczek, Nicolai Lehnert

❮ Previous
Next ❯


Jan 20, 2019·Applied and Environmental Microbiology·Darian N SmercinaLisa K Tiemann
Jul 31, 2019·Ecological Applications : a Publication of the Ecological Society of America·Jennifer Blesh
Nov 24, 2019·Ecological Applications : a Publication of the Ecological Society of America·Laura C Jach-Smith, Randall D Jackson
Oct 16, 2019·Frontiers in Microbiology·Esther SingerThomas E Juenger
Nov 22, 2019·Frontiers in Molecular Biosciences·Vadakattu V S R GuptaJames M Tiedje
Oct 11, 2020·FEMS Microbiology Ecology·Darian N SmercinaLisa K Tiemann
Jan 12, 2020·Communications Biology·Rachel HestrinJohannes Lehmann
Jun 22, 2021·Environmental Science and Pollution Research International·Aliya FazalYonghua Yang

❮ Previous
Next ❯

Methods Mentioned


Software Mentioned


Related Concepts

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.


Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.


Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.