About
22
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922
Citations
Introduction
Additional affiliations
March 2014 - present
February 2014 - February 2016
August 2012 - March 2014
Position
- Science, Tech and Policy Fellow; American Association for the Advancement of Science
Publications
Publications (22)
Mutually beneficial interactions between plants and other organisms are important to plant health and productivity. Through numerous mechanisms, including—but not limited to—the production of defensive compounds and antioxidants, mutualistic microbes can increase plant performance and resilience to a variety of perturbations. One example is the com...
Fungal endophytes have significant effects on host performance including but not limited to changes in reproductive output, as well as, biotic and abiotic stress tolerance. The ultimate mechanisms for resistance to herbiv-ory have been documented in a number of fungal-plant symbiota and involve the production of alkaloids by the fungus. Alkaloids h...
Reactive oxygen species are in all types of organisms from microbes to higher plants and animals. They are by-products of normal metabolism, such as photosynthesis and respiration, and are responsive to abiotic and biotic stress. Accumulating evidence suggests reactive oxygen species play a vital role in programmed cell death, stress responses, pla...
When a host organism is infected by a symbiont, the resulting symbiotum has a phenotype distinct from uninfected hosts. Genotypic interactions between the partners may increase phenotypic variation of the host at the population level. Neotyphodium is an asexual, vertically transmitted endophytic symbiont of grasses often existing in hybrid form. Hy...
We examined variation in growth rate, patterns of nitrogen utilization, and competitive interactions of Atractiella rhizophila isolates from the roots of Populus hosts. Atractiella grew significantly faster on media substituted with inorganic nitrogen sources and slower in the presence of another fungal genus. To determine plausible causal mechanis...
The importance of increasing crop production while reducing resource inputs and land-use change cannot be overstated especially in light of climate change and a human population growth projected to reach nine billion this century. Mutualistic plant–microbe interactions offer a novel approach to enhance agricultural productivity while reducing envir...
In this white paper, we briefly review the research literature exploring complex algal communities as a means of increasing algal biomass production via increased tolerance, resilience, and resistance to a variety of abiotic and biotic perturbations occurring within harvesting timescales. This paper will identify what data are available and whether...
This study tested whether the endophyte-promoted competitive superiority of forage grass can be used in biological weed control. Feasibility of endophytes in weed control was tested by manipulating endophyte colonization of meadow fescue (Scherodonus pratensis ex. Lolium pratense and Festuca pratensis) in three experiments. First, species richness,...
Vertically transmitted fungal endophytes can be beneficial for host grasses. While the alkaloid-mediated mechanism for herbivore resistance has been widely studied, underlying physiological mechanisms for increased tolerance to abiotic stress remain scarcely explored. In this study we used three maternal lines of perennial grass Festuca rubra to ex...
Pooideae grasses may be colonized by systemic fungal endophytes. The fitness of endophyte depends entirely on resources and seed transmission from the host plant, while colonized plants may gain increased survival, growth, and reproduction relative to their uncolonized conspecifics. Most research of endophyte-grass interactions have been carried ou...
Forecasts of species range shifts as a result of climate change are essential, because invasions by exotic species shape biodiversity and therefore ecosystem functions and services. Ecologists have focused on propagule pressure (for example, the number of individuals and invasion events), the characteristics of an invading species, and its new abio...
Most asexual fungal symbionts of grasses in the genus Neotyphodium occurring in nature are of hybrid origin. Most hybrid Neotyphodium species result from interspecific hybridization events between pathogenic EpichloA textlesstextless species or co-occurring non-hybrid Neotyphodium species. Current hypotheses for the prevalence of hybrid Neotyphodiu...
Most asexual fungal symbionts of grasses in the genus Neotyphodium occurring in nature are of hybrid origin. Most hybrid Neotyphodium species result from interspecific hybridization events between pathogenic Epichloë species or co-occurring non-hybrid Neotyphodium species. Current hypotheses for the prevalence of hybrid Neotyphodium species include...
Asexual, seedborne endophytic fungi in perennial grasses are often viewed as strong mutualists because fitness of the symbiont and host grass are closely coupled. However, at least for some native grasses, the asexual endophyte, Neotyphodium, acts parasitically, yet remains at high frequencies in natural populations. Most previous studies of Neotyp...
Asexual, systemic, and seed borne endophytes that live symbiotically in pooid grasses are thought to interact mutualistically with their hosts. The mutualism should be most evident in seed and seedling stages, where host fitness is directly affected. We tested the hypothesis that the seed borne endophyte, Neotyphodium, increases seed germination su...
Systemic endophytic fungi in agronomic and turf grasses are well known for conferring increased resistance to herbivores and to abiotic stresses, such as drought, and increasing competitive abilities. Many native grasses also harbor high frequencies of the asexual and vertically-transmitted endophyte, Neotyphodium. In Festuca arizonica (Arizona fes...
Thesis (M.S.)--Arizona State University, 2002. Includes bibliographical references (leaves [26]-36).
Questions
Questions (2)
I need peer-reviewed papers on or what limits exist in terms of engineering and breeding plants for disease and drought resistance (for example). Papers with an evolutionary query - if generalized disease resistance is expressed in plant populations with reduced genetic variation. Is this a selective force for increased disease virulence? Are these strategies temporally limited or due new techniques employing gene cassettes address such issues?
I am looking for publication (legislation, commentaries, peer-reviewed, opinions) on the reduction of synthetic chemicals in European agricultural markets. What was the motivation, what are the impacts locally to farmers and chemical producers, potential impacts to US chemical companies?
