A5015487173- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Sunflower and Safflower Cultivation
- Ecology and Vegetation Dynamics Studies
- Turfgrass Adaptation and Management
- Photosynthetic Processes and Mechanisms
- Genetic diversity and population structure
- Atmospheric chemistry and aerosols
- Tree-ring climate responses
- Plant and animal studies
- Genetic Mapping and Diversity in Plants and Animals
- Cassava research and cyanide
- Soybean genetics and cultivation
- Plant responses to water stress
- Wheat and Barley Genetics and Pathology
- Horticultural and Viticultural Research
- Plant Stress Responses and Tolerance
- Climate variability and models
- Plant Micronutrient Interactions and Effects
- Rangeland and Wildlife Management
- Remote Sensing in Agriculture
- Leaf Properties and Growth Measurement
- Toxic Organic Pollutants Impact
- Plant Molecular Biology Research
- Plant and Fungal Interactions Research
Ohio University
2013-2023
In-Q-Tel
2020
University of Illinois Urbana-Champaign
2008-2017
Harvard University
2017
United States Department of Agriculture
2011-2013
Agricultural Research Service
2009-2013
The University of Queensland
2012
Agriculture and Food
2012
University of Georgia
2002-2010
Urbana University
2010
Hybridization is frequent in many organismal groups, but its role adaptation poorly understood. In sunflowers, species found the most extreme habitats are ancient hybrids, and new gene combinations generated by hybridization speculated to have contributed ecological divergence. This possibility was tested through phenotypic genomic comparisons of synthetic hybrids. Most trait differences hybrids could be recreated complementary action were favored selection. The same parental chromosomal...
Abstract Extensive evidence shows that increasing carbon dioxide concentration ([CO2]) stimulates, and temperature decreases, both net photosynthetic assimilation (A) biomass production for C3 plants. However the [CO2]-induced stimulation in A is projected to increase further with warmer temperature. While influence of [CO2], independent each other, on have been widely investigated, interaction between these two major global changes has not tested field-grown crops. Here, interactive effect...
Abstract Background Biochemical models predict that photosynthesis in C 3 plants is most frequently limited by the slower of two processes, maximum capacity enzyme Rubisco to carboxylate RuBP (V c,max ), or regeneration via electron transport (J). At current atmospheric [CO 2 ] levels not saturated; consequently, elevating increases velocity carboxylation and inhibits competing oxygenation reaction which also catalyzed Rubisco. In future, leaf ( A ) should be increasingly regeneration, as...
Abstract We compared the levels and distribution of genetic diversity in Eurasian North American populations Brachypodium sylvaticum (Huds.) Beauv. (false brome), a newly invasive perennial bunchgrass western America. Our goals were to identify source regions for populations, determine number independent invasion events, assess possibility that postinvasion bottlenecks hybridization have affected patterns invaded range. tested hypothesis this grass was accidentally introduced into two areas...
Microarray analysis was performed on RNA isolated from guard cells that were manually dissected leaves of Arabidopsis. By pooling our data with those two earlier studies Arabidopsis cell protoplasts, we provide a robust view the guard-cell transcriptome, which is rich in transcripts for transcription factors, signaling proteins, transporters, and carbohydrate-modifying enzymes. To test hypothesis photosynthesis-derived sugar signals to adjust stomatal opening, determined profile genes...
Abstract Globally, cassava is the second most important root crop after potatoes and fifth overall in terms of human caloric intake. In addition to its growing global importance for feed, fuel, starch, has long been vital food security Sub‐ S aharan A frica. Climate change expected have severe impact on crops insecure regions, yet little known about how productivity will respond climate change. The driver globally increasing atmospheric CO 2 concentration ([ ]). However, potential enhance an...
Abstract There is an increasing necessity to understand how climate change factors, particularly atmospheric concentrations of CO 2 ([CO ]) and rising temperature, will influence photosynthetic carbon assimilation ( A ). Based on theory, increased [CO ] concomitant with a rise in temperature increase C3 plants beyond that alone. However, uncertainty surrounding the acclimation response key parameters these changes can this response. In work, responses photosynthesis for soybean measured at...
The primary requirement for a new diploid species to arise via hybridization is ecological divergence from its parental species. Ecological protects the nascent hybrid competition with progenitor and may contribute reproductive isolation. However, means by which might facilitate necessary adaptive transitions are poorly understood. Here, we report results of glasshouse experiment in 42 morphological ecophysiological traits were measured three sunflower (Helianthus anomalus, Helianthus...
Abstract Much of our knowledge speciation genetics stems from quantitative trait locus (QTL) studies. However, interpretations the size and distribution QTL underlying species differences are complicated by in way magnitudes estimated. Also, many studies fail to exploit information about directions or compare inter- intraspecific variation. Here, we comprehensively analyze an extensive data set for interspecific backcross between two wild annual sunflowers, Helianthus annuus H. petiolaris,...
Leaf ecophysiological traits related to carbon gain and resource use are expected be under strong selection in desert annuals. We used comparative phenotypic approaches investigate the importance of leaf for Helianthus anomalus, a diploid annual sunflower species hybrid origin that is endemic active dunes. Comparisons were made within among five genotypic classes: H. its ancestral parent (H. annuus petiolaris), two backcrossed populations parental (designated BC2ann BC2pet) representing...
Habitats that differ in soil resource availability are expected to for selection on resource-related plant traits. Here, we examined spatial and temporal variation phenotypic leaf ecophysiological traits 10 Helianthus populations, including two species of hybrid origin, anomalus deserticola, artificial hybrids their ancestral parents. Leaf assessed were size, succulence, nitrogen (N) concentration water-use efficiency (WUE). Biomass indicate the actively moving dune habitat H. was more...
Hybrid speciation is thought to be facilitated by escape of early generation hybrids into new habitats, subsequent environmental selection and adaptation. Here, we ask whether two homoploid hybrid plant species (Helianthus anomalus, H. deserticola) diverged sufficiently from their ancestral parent (H. annuus, petiolaris) during so that they are more fit than the in habitats. parental were reciprocally transplanted Helianthus anomalus was actively moving desert dune habitat. The abilities...
Photosynthetic efficiency is a critical determinant of crop yield potential, although it remains below the theoretical optimum in modern varieties. Enhancing mesophyll conductance (i.e. rate carbon dioxide diffusion from substomatal cavities to sites carboxylation) may increase photosynthetic and water use efficiencies. To improve efficiency, should be increased without concomitantly increasing stomatal conductance. Here, we partition variance within- among-cultivar components across soybean...
Summary Leaf shape, a spectacularly diverse plant trait, varies across taxonomic levels, geography and in response to environmental differences. However, comprehensive intraspecific analyses of leaf shape variation variable environments is surprisingly absent. Here, we performed multilevel analysis using accessions sweet potato ( Ipomoea batatas ), uncovered the role genetics, environment, G×E on this important trait. We examined variety morphometric analyses, complement with transcriptomic...
The diploid hybrid species Helianthus deserticola inhabits the desert floor, an extreme environment relative to its parental annuus and petiolaris. Adaptation floor may have occurred via selection acting on transgressive, or extreme, traits in early hybrids between species. We explored this possibility through a field experiment species' native habitat using H. deserticola, annuus, petiolaris, two populations of early‐generation (BC2) species, which served as proxies for ancestral genotype...
Abstract The atmospheric [ CO 2 ] in which crops grow today is greater than at any point their domestication history and represents an opportunity for positive effects on seed yield that can counteract the negative of heat drought this century. In order to maximize yields under future ], we need identify study crop cultivars respond most favorably elevated understand mechanisms contributing responsiveness. Soybean ( Glycine max Merr.) a widely grown oilseed shows genetic variation response...