The role of Ca ions in changes induced by excess Cu2+ in bean plants. Growth parameters

The effect of Ca on Cu toxicity in runner bean plants (Phaseolus coccineus L. cv. Piěkny Jaś) grown hydroponically in nutrient solution was studied. The toxic effect of excess Cu on plants depends on their age and Ca content in the medium. Copper applied in excess to the plants at the early phase of...

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Bibliographic Details
Published in:Acta physiologiae plantarum 1998-01, Vol.20 (4), p.411-417
Main Authors: Maksymiec, Waldemar, Baszyński, Tadeusz
Format: Article
Language:English
Subjects:
Accumulation
Beans
Calcium ions
Chloroplasts
Copper
Growth stage
Hydroponics
Ions
Leaves
Low level
Nutrient content
Nutrient uptake
Organs
Phaseolus coccineus
Pigments
Plants
Senescence
Toxicity
Translocation
Water deficit
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Summary:The effect of Ca on Cu toxicity in runner bean plants (Phaseolus coccineus L. cv. Piěkny Jaś) grown hydroponically in nutrient solution was studied. The toxic effect of excess Cu on plants depends on their age and Ca content in the medium. Copper applied in excess to the plants at the early phase of leaf development strongly limits the uptake of Ca ions from the nutrient solution, particularly their translocation to leaves. Increased Ca content limits the inhibitory effect of Cu on leaf growth and decreases the content of chloroplast pigments to the level approximate to that of control. At this growth stage the effect of excess Cu is at least partially connected with limited Ca transport to leaves.At the intermediate leaf phase Cu-treated plants react slightly to changed Ca content.At the end of the primary leaf development increased Ca concentration in the medium intensifies senescence processes induced by excess Cu. The changes are partially connected with intensified water deficit. Increased Ca content in the nutrient solution limits Cu accumulation in the individual organs of Cu-treated plants. However, Cu accumulation in leaves is not decreased at a high level of Ca. Copper generally decreases Ca content in the youngest plants, whereas in the oldest ones only in the case of a low level of Ca in the nutrient solution.
ISSN:0137-5881
1861-1664
DOI:10.1007/s11738-998-0028-y