seedlings of five canola genotypes (hyola308, hyola401, hyola60, optlon50, and rgs003), were grown in hoagland nutrient solution containing s1=0, s2=100, s3=200 and s4=300 mm nacl in controlled environment. such antioxidant activities as catalase (cat), ascobrate peroxidase (apx) and guaiacol peroxidase (gpx), as well as osmolyte concentration (proline), chlorophyll fluorescence and some enzyme...

heavy metal pollution is a worldwide problem with serious environmental consequences. the objective of the present experiment was to investigate whether arginine as nitric oxide precursor and or polyamines substrate can decrease the destructive effects of oxidative stress induced by nickel contamination in hyoscyamus niger plant. in this study the effects of arginine pretreatment on alkaloid co...

This paper describes a series of environmental chamber experiments and gas/particlephase chemical analysis performed in order to elucidate the mechanisms of SOA formation from biomass burning intermediates: phenol, guaiacol, and syringol under low NOx conditions. Time-profiles of signals observed by the CIMS, in comparison with SOA mass, suggested that ring-fragment carboxylic acids were in equ...

In some ways the effects of hexylresorcinol on Nitella resemble those of guaiacol but in others they differ. Both substances depress the P.D. reversibly and both decrease the potassium effect. Hexylresorcinol decreases the apparent mobility of Na(+) and of K(+). Guaiacol increases that of Na(+) but not of K(+). The action of hexylresorcinol is more striking than that of guaiacol since 0.0003 M ...

Typha latifolia (cattail) forms natural stands in the transition zone of artificial flotation and mine tailings ponds is contaminated with extremely high concentrations metals. We assessed absorption capacity plant, metal transfer to leaves, effects elevatedmetal on antioxidant enzyme activities. Soil acidity, pseudo-total available content substrate, plants were examined. The elevated activiti...

The aim of this study was to assess the antioxidant response towards urban air pollution three widespread ornamental species—Tilia tomentosa, Fraxinus excelsior and Pinus nigra. Saplings were planted in four plots with different anthropogenic impacts, periodic observations performed on their development. Three types biochemical markers, representing plant responses by mechanisms, analyzed: phot...

Plants of Oh43 X Wf9 corn (Zea mays L.), grown in a sand culture system, were watered daily with nutrient solution containing 0.025, 1.25, or 2.5 ppm Fe. Plants also were grown in a soil-sand mixture. Leaf extracts were assayed quantitatively for peroxidase activity, and samples of the extracts were subjected to gel electrophoresis. A positive relationship was observed between Fe supply and pro...