Scott A. Heckathorn

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Atmospheric carbon dioxide (CO2) and global mean temperature are expected to be significantly higher by the end of the 21st century. Elevated CO2 (eCO2) and higher temperature each affect plant physiology and growth, but their interactive effects have not been reviewed statistically with respect to higher chronic mean temperatures and abrupt heat stress. In(More)
The relative importance of stomatal and nonstomatal limitations to net photosynthesis (A) and possible signals responsible for stomatal limitations were investigated in unhardened Pinus taeda seedlings at low soil temperatures. After 2 days at soil temperatures between 13 and 7 degrees C, A was reduced by 20 to 50%, respectively. The reduction in A at these(More)
Chloroplast-localized small heat-shock proteins (Cp-sHSP) protect Photosystem II and thylakoid membranes during heat and other stresses, and Cp-sHSP production levels are related to plant thermotolerance. However, to date, a paucity of Cp-sHSP sequences from C4 or CAM species, or from other extremely heat-tolerant species, has precluded an examination to(More)
The chloroplast small heat shock proteins (Cp-sHSP) protect photosystem II and thylakoid membranes during heat and other types of stresses. The amount of Cp-sHSPs produced is correlated with plant thermotolerance. Cp-sHSPs of Chenopodium album have already been shown to be heat-regulated and have a novel promoter architecture containing some conserved(More)
Effects of elevated CO2 on N relations are well studied, but effects on other nutrients, especially micronutrients, are not. We investigated effects of elevated CO2 on response to variation in boron (B) availability in three unrelated species: seed geranium (Pelargonium x hortorum), barley (Hordeum vulgare), and water fern (Azolla caroliniana). Plants were(More)
Plants are sessile organisms that have to cope with different environmental stresses during their life cycle. Photosystem II is one of the most labile processes affected by abiotic stress. The chloroplast small heat shock proteins (Cp-sHSPs) are known to protect photosystem II and thylakoid membranes during heat stress. Previously, we reported several(More)
The use of microalgae for biofuel production has the potential to reduce fossil fuel consumption. Ideal candidate species of microalgae for bio-oil production need both relatively high growth rates and lipid content. Here, we report on the effects of temperature, nutrients (N, Si), and salinity on growth rates and lipid content of the common freshwater(More)
Plants with Crassulacean acid metabolism must cope with severe environmental stresses including heat-limited, water-limited, and CO2-limited environments throughout their life cycles in arid or semiarid habitats. Heat stress affects the rate of photosynthesis and related thermotolerance in many plants. To elucidate the mechanism(s) of heat tolerance and the(More)
Heat-waves with higher intensity and frequency and longer durations are expected in the future due to global warming, which could have dramatic impacts in agriculture, economy and ecology. This field study examined how plant responded to heat-stress (HS) treatment at different timing in naturally occurring vegetation. HS treatment (5 days at 40.5°C) were(More)
Dreissena spp. (zebra and quagga mussels) are invasive to North America and increase light to the benthos, provide hard structure for algal attachment, and may contribute limiting nutrients to benthic algae, thereby facilitating algal blooms. We conducted experiments to determine how Dreissena affect nutrient stoichiometry and growth of Lyngbya wollei and(More)