Lead researcher Tesfamariam Mekete, a U of I post-doctoral research associate, said the team's first step was to identify potential pathogenic nematodes of these top two energy-yielding cellulosic-ethanol feedstock plants.
"Nematodes are a part of our soil systems," Mekete said. "However, when it comes to potential crops for biofuel production, we simply don't know which nematodes are present in these crops and at what levels."
The 2008-09 nematode survey included samples from 37 Miscanthus and 48 switchgrass plots in Illinois, Georgia, Iowa, Kentucky, South Dakota and Tennessee.
All sample sites had at least two nematode species that have been reported to reduce biomass in most monocotyledon hosts. The damaging population thresholds for these nematodes to Miscanthus and switchgrass are still unknown. However, the population densities encountered may present a potential risk to biofuels production when compared with threshold densities reported on other monocotyledon hosts, Mekete said.
Researchers discovered lesion (Pratylenchus), dagger (Xiphinema), needle (Longidorus), lance (Hoplolaimus), stunt (Tylenchorhynchus), spiral (Helicotylenchus), and ring (Criconema) in Miscanthus and switchgrass. These nematodes have previously been reported to cause damage to several plant species such as corn, bent grass, switchgrass and turf grasses.
"The high levels of nematodes found in our survey and the damage symptoms observed in infected roots suggest parasitism may contribute to the decline of biomass production," Mekete said.
Needle nematodes, discovered at high levels in the sandy soils of Havana, Ill., and Georgia, caused visible stunting of lateral roots and destruction of the fibrous root system. Mekete's team hopes to do further research in Havana to study the interaction between this nematode and biomass yield.
Researchers are now studying damage thresholds of lesion, root-knot and needle nematodes to Miscanthus and switchgrass under greenhouse conditions. Future studies will include host suitability and population dynamics of the most prevalent nematodes associated with these perennial grasses.
In addition to discovering information on the distribution, presence, abundance and identification of these nematodes, researchers also developed species-specific DNA tests to help identify nematodes so future research can focus on developing control tactics.
"Diseases and pests have the potential to cause significant constraints on biomass production, putting the crops at risk for reductions in biomass yield and quality," Mekete said. "Of the many pests and diseases, plant-parasitic nematodes are of great economic importance because they can directly influence plant biomass and predispose plants to attack by other soil-borne pathogens."
Portions of this research have been published in GCB Bioenergy. The research was funded by EBI. The research team included Tesfamariam Mekete, Kimberly Reynolds, Horacio Lopez-Nicora, Michael Gray and Terry Niblack of the U of I.
The EBI is the world's largest public/private consortium dedicated to the development of bioenergy and the holistic assessment of a future biofuels industry. It is a partnership of three public institutions and a corporate sponsor: the University of California, Berkeley; the University of Illinois at Urbana-Champaign; Lawrence Berkeley National Laboratory; and the international energy company BP. Now in its third year, the EBI is comprised of more than 300 researchers pursuing 60 programs and projects. BP has committed $500 million over 10 years to support the institute.
Single-stranded DNA and RNA origami go live
15.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard
New antbird species discovered in Peru by LSU ornithologists
15.12.2017 | Louisiana State University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences