Abstract
Ten day old bush bean plants (Phaseolus vulgaris L. cv Contender) were used to analyze the effects of 3 micromolar Cd on the time courses of expansion growth, dry weight, leaf water relations, stomatal resistance, and abscisic acid (ABA) levels in roots and leaves. Control and Cd-treated plants were grown for 144 hours in nutrient solution. Samples were taken at 24 hour intervals. At the 96 and 144 hour harvests, additional measurements were made on excised leaves which were allowed to dry for 2 hours. From the 48 hour harvest, Cd-treated plants showed lower leaf relative water contents and higher stomatal resistances than controls. At the same time, root and leaf expansion growth, but not dry weight, was significantly reduced. The turgor potentials of leaves from Cd-treated plants were nonsignificantly higher than those of control leaves. A significant increase (almost 400%) of the leaf ABA concentration was detected after 120 hours exposure to Cd. But Cd was found to inhibit ABA accumulation during drying of excised leaves. It is concluded that Cd-induced decrease of expansion growth is not due to turgor decrease. The possible mechanisms of Cd-induced stomatal closure are discussed.
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Claims 8
Claim · model-written summary
Cadmium lowered leaf relative water contents after 48 hours.
Verbatim
e0“From the 48 hour harvest, Cd-treated plants showed lower leaf relative water contents and higher stomatal resistances than controls.”
Claim · model-written summary
Cadmium raised stomatal resistance after 48 hours.
Verbatim
e0“From the 48 hour harvest, Cd-treated plants showed lower leaf relative water contents and higher stomatal resistances than controls.”
Claim · model-written summary
Cadmium significantly reduced root expansion growth.
Not reportedComparator
Verbatim
e0“At the same time, root and leaf expansion growth, but not dry weight, was significantly reduced.”
t0“Influence of Cadmium on Water Relations, Stomatal Resistance, and Abscisic Acid Content in Expanding Bean Leaves”
Claim · model-written summary
Cadmium significantly reduced leaf expansion growth.
Not reportedComparator
Verbatim
e0“At the same time, root and leaf expansion growth, but not dry weight, was significantly reduced.”
t0“Influence of Cadmium on Water Relations, Stomatal Resistance, and Abscisic Acid Content in Expanding Bean Leaves”
Claim · model-written summary
Cadmium did not significantly reduce dry weight.
Not reportedComparatorValue
Verbatim
e0“At the same time, root and leaf expansion growth, but not dry weight, was significantly reduced.”
t0“Influence of Cadmium on Water Relations, Stomatal Resistance, and Abscisic Acid Content in Expanding Bean Leaves”
Claim · model-written summary
Cadmium-treated leaves had nonsignificantly higher turgor potentials than control leaves.
Verbatim
e0“The turgor potentials of leaves from Cd-treated plants were nonsignificantly higher than those of control leaves.”
Claim · model-written summary
Leaf ABA concentration rose almost 400% after 120 hours of cadmium exposure.
- Taxon
- Beant0
- Treatment
- Cde0
- Outcome
- leaf ABA concentratione0
- Direction
- increasee0
- Value
- almost 400%e0
- Qualifier
- after 120 hours exposure to Cde0
Not reportedComparator
Verbatim
e0“A significant increase (almost 400%) of the leaf ABA concentration was detected after 120 hours exposure to Cd.”
t0“Bean Leaves”
Claim · model-written summary
Cadmium inhibited ABA accumulation during drying of excised leaves.
Not reportedComparator
Verbatim
e0“Cd was found to inhibit ABA accumulation during drying of excised leaves.”
t0“Bean Leaves”
The same questions in other papers
cadmium atom · growth · Phaseolus vulgaris (common bean)Results differ
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1 paper in the same direction as this paper
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.