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Water Relations of Chromium VI Treated Bush Bean Plants (Phaseolus vulgaris L. cv. Contender) under both Normal and Water Stress Conditions 总被引:1,自引:0,他引:1
BARCEL? JUAN; POSCHENRIEDER CHARLOTTE; GUNS? BENET 《Journal of experimental botany》1986,37(2):178-187
The effect of Chromium VI on leaf water potential (w), solutepotential (a), turgor potential (p) and relative water content(RWC) of primary and first trifoliatc leaves of Phaseolus vulgarisL. was studied under normal growth conditions and during anartificially induced water stress period in order to establishthe possible influence of this heavy metal on the water stressresistance of plants. Plants were grown on perlite with nutrientsolution containing 0, 10, 25, 50 or 100µg cm3 Cr as Na2Cr2O7.2H2O. The effect of Cr onwater relations was highly concentration dependent, and primaryand first trifoliate leaves were affected differently. The growthreducing concentrations of Cr (25, 50 and 100µg cm3) generally decreased s and w and increasedp in primary leaves. The 10 µg cm3 Cr treatmentdid not affect growth, but altered water relations substantially:in primary leaves w and p were increased and s decreased, whilein trifoliate leaves the effect was the opposite. All Cr treatedplants resisted water stress for longer than control plants.The higher water stress resistance may be due to the lower sand to the increased cell wall elasticity observed in Cr VItreated plants. Key words: Phaseolus vulgaris, Chromium VI, water stress, Richter plot 相似文献
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ANA RODRIGO‐MORENO NURIA ANDRÉS‐COLÁS CHARLOTTE POSCHENRIEDER BENET GUNSÉ LOLA PEÑARRUBIA SERGEY SHABALA 《Plant, cell & environment》2013,36(4):844-855
Transition metals such as copper can interact with ascorbate or hydrogen peroxide to form highly reactive hydroxyl radicals (OH?), with numerous implications to membrane transport activity and cell metabolism. So far, such interaction was described for extracellular (apoplastic) space but not cytosol. Here, a range of advanced electrophysiological and imaging techniques were applied to Arabidopsis thaliana plants differing in their copper‐transport activity: Col‐0, high‐affinity copper transporter COPT1‐overexpressing (C1OE) seedlings, and T‐DNA COPT1 insertion mutant (copt1). Low Cu concentrations (10 µm ) stimulated a dose‐dependent Gd3+ and verapamil sensitive net Ca2+ influx in the root apex but not in mature zone. C1OE also showed a fivefold higher Cu‐induced K+ efflux at the root tip level compared with Col‐0, and a reduction in basal peroxide accumulation at the root tip after copper exposure. Copper caused membrane disruptions of the root apex in C1OE seedlings but not in copt1 plants; this damage was prevented by pretreatment with Gd3+. Our results suggest that copper transport into cytosol in root apex results in hydroxyl radical generation at the cytosolic side, with a consequent regulation of plasma membrane OH?‐sensitive Ca2+ and K+ transport systems. 相似文献
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