1,721,168 research outputs found
INTERAZIONE TRA STRESS TIPICI DELL'AREA MEDITERRANEA: DANNI DA OZONO E DA CARENZA IDRICA SU TRIFOLIUM REPENS E LOLIUM PERENNE.
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Ozone and water stress: effects on the behaviour of two white clover (Trifolium repens L.) biotypes.
No full textSince ozone penetration in vegetation occurs mainly through stomata, all factors which alter plant-atmosphere relations could be able to modify plant response to ozone. Interaction between ozone and water stress in Mediterranean environment was studied on ozone resistant (R) and sensitive (S) biotypes of white clover, which were grown in charcoal filtered and not-filtered Open Top Chambers. Measurements of biomass, leaf area and stomata conductance were made during the growth period. Ozone injuries were estimated by the ratio between biomass yield gained in not-filtered and in filtered OTC; ozone uptake was estimated by the stomata conductance and ozone hourly concentrations. In presence of ozone, biomass yield was higher in R biotype than in S biotype, while no difference between the two biotypes was recorded in filtered air. Water stress partially reduced ozone injuries, as well as water stress effect was partially reduced in S biotype grown in the presence of ozone, while no interaction between ozone and water stress was noticed in R biotype. Yield losses of S was significantly correlated to cumulated ozone uptake, while yield losses of R was not influenced by variations in ozone fluxes. Flux based models could better estimate yield losses due to ozone in Mediterranean environments in which other stresses could be contemporary present; therefore, the new European directives might modify the actual thresholds based on ozone concentration with others based on models of stomata flux of ozone
THE DYNAMICS OF OZONE ABSORBING BY A COVER CROP UNDER MEDITERRANEAN CLIMATE: PRELIMINARY RESULTS.
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Ozone and Water Stress: two years of trials In Open Top Chambers with two White Clover (Trifolium repens L.) Biotypes
No full textInteraction between Stress typical of the Mediterranean Area: Ozone damages and Water Stress on Trifolium repens and Lolium perenne.
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Effect of organic fertilisers in Southern Italy: preliminary data on nitrogen dynamics in soil-plant system.
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