Publications

iron-oxidizing bacteria are associated with ferric hydroxide precipitates (fe-plaque) on the roots of wetland plants	the presence of fe-oxidizing bacteria in the rhizosphere of four different species of wetland plants was investigated in a diverse wetland environment that had fe(ii) concentrations ranging from tens to hundreds of micromoles per liter and a ph range of 3.5 to 6.8. enrichments for neutrophilic, putatively lithotrophic fe-oxidizing bacteria were successful on roots from all four species; acidophilic fe-oxidizing bacteria were enriched only on roots from plants whose root systems were exposed to s ...	1999	10347074
chiral response of oryzeae and paniceae plants in alpha-methylbenzyl-3-p-tolyl urea agar medium.	the results presented here support the hypothesis that plants of the tribe oryzeae respond enantioselectively and homogeneously to optically active 1-alpha-methylbenzyl-3-p-tolylurea (mbtu) in root growth inhibition, in contrast to echinochloa species. the oryzeae plants tested in this study belong to different genera (oryza, leersia, chikusichloa and zizania), to different species (o sativa, o glaberrima, o alta, o coarctata, o latifolia, o minuta, o rufipogon), to various ecospecies of oryza ( ...	2004	14727742
innovative uses of vegetated drainage ditches for reducing agricultural runoff.	vegetated agricultural ditches play an important role in mitigation of pesticides following irrigation and storm runoff events. in a simulated runoff event in the mississippi (usa) delta, the mitigation capacity of a drainage ditch using the pyrethroid esfenvalerate (asana xl) was evaluated. the pesticide was amended to soil prior to the runoff event to simulate actual runoff, ensuring the presence of esfenvalerate in both water and suspended particulate phases. water, sediment, and plant sample ...	2004	15053106
some effects of acidic growing conditions on three emergent macrophytes: zizania aquatica, leersia oryzoides and peltandra virginica.	transplants of zizania aquatica l., leersia oryzoides (l.) shwartz, and peltandra virginica (l.) schott and endl. were grown for ten weeks in simulated marsh conditions under acidic (ph 3.0, ph 4.0) treatment regimes and compared with controls (ph 5.6). mortality was low in all treatments and nearly all plants of z. aquatica and l. oryzoides flowered. under acidic conditions, transplant height and root biomass of z. aquatica were significantly reduced, with greater culm numbers and total lengths ...	1992	15091985
plant senescence: a mechanism for nutrient release in temperate agricultural wetlands.	the beneficial uptake of nutrients by wetland plants is countered to some extent by nutrient release back into the aquatic environment due to vegetative die-back. this current study examined whether leersia oryzoides, a common wetland plant, exhibits luxury uptake of nutrients from simulated farm runoff. the study also tested whether with subsequent decomposition, these nutrients are released back into the water column. when exposed to elevated (>2mg/l n and p) runoff, l. oryzoides assimilated s ...	2007	16905226
phytoextraction of arsenic from soil by leersia oryzoides.	the potential of leersia oryzoides (rice-cut grass) to remediate arsenic-contaminated soil was studied in greenhouse pot experiments. leersia oryzoides grown in soil amended with arsenic to a concentration of 110 mg kg(-1), extracted up to 305 mg kg(-1) and 272 mg kg(-1) arsenic into its shoots and roots, respectively, giving a shoot:root quotient of 1.12 and phytoextraction coefficients up to 2.8. plants in the arsenic-amended soil showed visible signs of stress in the first 8 wk of growth, but ...	2017	18246713
ability of four emergent macrophytes to remediate permethrin in mesocosm experiments.	increased focus is being placed on the ability of native vegetation to mitigate potential harmful effects of agricultural runoff, especially pyrethroid insecticides. replicate 379 l rubbermaid tubs (1.25 m [l] x 0.6 m [w] x 0.8 m [h]) were planted with individual species of cutgrass (leersia oryzoides), cattails (typha latifolia), bur-reed (sparganium americanum), and powdery alligator-flag (thalia dealbata), all common wetland macrophytes found in the mississippi delta, usa, agricultural region ...	2009	19458989
aqueous pesticide mitigation efficiency of typha latifolia (l.), leersia oryzoides (l.) sw., and sparganium americanum nutt.	agricultural pesticide use is necessary to help meet the increased demand for a safe and secure food supply for the united states, as well as the global community. even with proper application and careful management, the possibility of pesticide leaching and detachment in runoff still exists following certain storm events. several different management practices have been designed to reduce the impacts of pesticides on aquatic receiving systems. many such practices focus on the use of vegetation ...	2013	23732006
recovery of freshwater marsh vegetation after a saltwater intrusion event.	greenhouse mesocosms of freshwater marsh vegetation were exposed to a simulated saltwater intrusion event followed by a recovery period during which water levels and interstitial water salinity were adjusted over a range of conditions. virtually all above-ground vegetation, including the three dominant species, sagittaria lancifolia l., leersia oryzoides (l.) swartz, and panicum hemitomon schultes, was killed by the initial saltwater intrusion event. p. hemitomon did not recover, but s. lancifol ...	1995	28306946
mitigation of atrazine, s-metolachlor, and diazinon using common emergent aquatic vegetation.	by the year 2050, the population of the united states is expected to reach over 418 million, while the global population will reach 9.6 billion. to provide safe food and fiber, agriculture must balance pesticide usage against impacts on natural resources. challenges arise when storms cause runoff to be transported to aquatic receiving systems. vegetated systems such as drainage ditches and constructed wetlands have been proposed as management practices to alleviate pesticide runoff. twelve exper ...	2017	28571845
seasonal differences in relationships between nitrate concentration and denitrification rates in ditch sediments vegetated with rice cutgrass.	increased application of nitrogen (n) fertilizers in agricultural systems contributes to significant environmental impacts, including eutrophication of fresh and coastal waters. rice cutgrass [ (l.) sw.] can significantly enhance denitrification potential in agricultural ditch sediments and potentially reduce n export from agricultural watersheds, but relationships with known drivers are not well understood. to address this, we examined effects of nitrate (no) availability on dinitrogen gas (n) ...	2017	29293830