Water relations of chromium VI treated bush bean plants (Phaseolus vulgaris L. cv. contender) under both normal and water stress conditions

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Abstract

The effect of Chromium VI on leaf water potential (ψw), solute potential (ψa), turgor potential (ψp) and relative water content (RWC) of primary and first trifoliatc leaves of Phaseolus vulgaris L. was studied under normal growth conditions and during an artificially induced water stress period in order to establish the possible influence of this heavy metal on the water stress resistance of plants. Plants were grown on perlite with nutrient solution containing 0, 1{dot operator}0, 2{dot operator}5, 5{dot operator}0 or 10{dot operator}0 μg cm-3Cr as Na2Cr2O7.2H2O. The effect of Cr on water relations was highly concentration dependent, and primary and first trifoliate leaves were affected differently. The growth reducing concentrations of Cr (2{dot operator}5, 5{dot operator}0 and 10{dot operator}0 μg cm-3) generally decreased ψsand ψwand increased ψpin primary leaves. The 1{dot operator}0 μg cm-3Cr treatment did not affect growth, but altered water relations substantially: in primary leaves ψwand ψpwere increased and ψsdecreased, while in trifoliate leaves the effect was the opposite. All Cr treated plants resisted water stress for longer than control plants. The higher water stress resistance may be due to the lower ψsand to the increased cell wall elasticity observed in Cr VI treated plants. © 1986 Oxford University Press.
Original languageEnglish
Pages (from-to)178-187
JournalJournal of Experimental Botany
Volume37
DOIs
Publication statusPublished - 1 Feb 1986

Keywords

  • Chromium VI
  • Phaseolus vulgaris
  • Richter plot
  • Water stress

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