2 research outputs found
Cellular investigation on the role Of Osmotic Pressure in Limiting the Toxic Effects of Pesticidesin Durum Wheat (Triticum durum Desf.)
No full textInternational audienceSoil salinity is considered a major limiting factor in plant development, given the importance of cereals as an essential nutritional material worldwide. The present study is interested in demonstrating the effects of the salt stress / herbicide interaction on the roots of a plant model: durum wheat (Triticum durum) of the WAHA variety.The results obtained show that wheat is a plant sensitive to the action of NaCl. However, we have observed morphophysiological and metabolic disturbances in seeds subjected to saline stress in increasing doses, after germination.The measurement of the enzymatic activity shows a stimulation of the Catalase activity (CAT) accompanied by a production of hydrogen peroxide at the origin of oxidative stress, this increase is proportional to the degree of stress induced. Also, this stress induced the release of electrolytes.In parallel, we were interested in the toxicity of glyphosate. The penetration of the herbicide inside the plant has led to remarkable morpho-physiological and biochemical disturbances.Regarding the NaCl / Glyphosate interaction, we note a clear improvement in the majority of the measured parameters, this can be considered as an antagonism effect between the two stresses allowing better root growth
Silicij kot potencialno bioremediacijsko sredstvo za ublažitev toksičnosti aluminija v vodnih mikroalgah: Posledice za trajnostne kmetijske ekosisteme
No full textHeavy metal pollution in agricultural and aquatic ecosystems poses significant threats to microorganisms essential for ecological balance. Microalgae, as primary producers, are particularly vulnerable to such contaminants while being vital components of sustainable agricultural systems. This study investigated the comparative effects of silicon (Si) and aluminum (Al) on three economically important microalgae species: Chlorella vulgaris, Haematococcus pluvialis, and Tetraselmis suecica. Microalgae cultures were exposed to varying concentrations of aluminum (1, 10, and 100 mg/L) and silicon (100, 150, and 200 mg/L) for three weeks under controlled conditions. Aluminum treatment resulted in significant concentration-dependent growth inhibition (37-62%) and decreased total chlorophyll content, with observable morphological alterations including cell swelling and chlorophyll degradation. Conversely, silicon treatment exhibited minimal adverse effects on microalgal growth, biomass, and chlorophyll content compared to both Al-exposed and control groups. These findings suggest that silicon could serve as an effective protective agent against aluminum toxicity in aquatic ecosystems, with potential applications in agricultural water management and bioremediation of metal-contaminated irrigation systems. The study contributes to understanding metalloid interactions in aquatic microorganisms, supporting sustainable agricultural practices through improved water quality management and protection of beneficial microalgae in farm ecosystems.Onesnaženje s težkimi kovinami v kmetijskih in vodnih ekosistemih močno ogroža mikroorganizme, ki so bistveni za ekološko ravnovesje. Mikroalge kot primarni proizvajalci so še posebej občutljive na takšne onesnaževalce. V tej raziskavi so izvedli nadzorovan laboratorijski poskus, da bi ocenili in primerjali posebne vplive izpostavljenosti siliciju (Si) in aluminiju (Al) na rast, biomaso, vsebnost klorofila in morfologijo treh gospodarsko pomembnih vrst mikroalg: Chlorella vulgaris, Haematococcus pluvialis in Tetraselmis suecica. Kulture so bile tri tedne v nadzorovanih razmerah izpostavljene različnim koncentracijam aluminija (1, 10 in 100 mg l-1) in silicija (100, 150 in 200 mg l-1). Rezultati so pokazali, da je aluminij povzročil pomembno, od koncentracije odvisno zaviranje rasti (37–62 %), zmanjšal skupno vsebnost klorofila in povzročil morfološke spremembe, kot sta nabrekanje celic in razgradnja klorofila. Nasprotno pa obravnavanje s silicijem ni pokazalo le minimalnih škodljivih učinkov, ampak tudi delno zaščitno vlogo z ohranjanjem večje rasti in večje vsebnosti klorofila v primerjavi s skupinami, izpostavljenimi Al. Te ugotovitve jasno kažejo, da lahko silicij ublaži toksičnost aluminija v mikroalgah in poveča njihovo odpornost na obremenitev s kovinami. Čeprav te ugotovitve niso neposredno uporabne za višje rastline, ponujajo vpogled v interakcije mikrobnih metaloidov, ki so pomembne za zaščito pridelka, posredovano s Si
