Effects of PEG-induced Water Stress on Calcium Uptake in Peach Seedlings

in Journal of the American Society for Horticultural Science
Authors:
Melanie F. HaberDepartment of Horticulture and Forestry, Rutgers University, New Brunswick, NJ 08903

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Eric YoungDepartment of Horticultural Science, North Carolina State University, Raleigh, NC 27650

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M. FaustFruit Laboratory, Horticultural Science Institute, Science and Education Administration, U.S. Department of Agriculture, Beltsville, MD 20705

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Abstract

Polyethylene glycol (PEG-4000)-induced water stress (—0.5 to —7.5 bars) reduced shoot and root growth, water use, and stem 45Ca in seedlings of peach (Prunus persica (L.) Batsch). Sucrose feeding through a leaf did not affect stem 45Ca with or without osmotic stress. 45Calcium uptake per milligram water used was not different at different solution osmotic potentials. A split-root study, with half the root system receiving 45Ca and/or PEG, showed that if 45Ca was supplied only to the water-stressed root half, 45Ca uptake into stems was low regardless of whether the other root half was stressed or not. Results indicate that reduced stem Ca during water stress is probably not a direct result of decreased root energy needed for active uptake or reduced translocation out of the root. Calcium absorption appeared to be related to the amount of unsuberized root surface available for Ca uptake.

Contributor Notes

Graduate Research Assistant. Present address: RGTI Systems Software, 1 Penn Plaza, New York, NY 10001.

Assistant Professor.

Plant Physiologist.

Received for publication January 28, 1983. From a dissertation submitted by M.F. Haber in partial fulfillment of the requirements of the MS degree at Rutgers University. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

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