Year: 1980
Type: article
Abstract: Polyethylene glycol (PEG)-induced water stress in nutrient solutions decreased both water consumption and 45 Ca uptake by apple seedlings ( Malus domestica Borkh.) The decrease in water uptake was more severe than the decrease in 45 Ca uptake. When 45 Ca uptake was calculated on the basis of water consumption, it was found that 45 Ca uptake was not dependent on water uptake although water was necessary for movement of 45 Ca. In split-root experiments, PEG and 45 Ca were either applied to the same half of the root or to separate halves. Calcium uptake decreased in plants subjected to water stress. The results indicated that the site of this decrease was at the root, not the aerial portion of the plant which, indirectly, may affect root function and thus 45 Ca uptake. Split-root experiments also indicated that the unstressed half of the root cannot fully compensate for the stressed half of the root in either water or 45 Ca uptake. Water use of plants with half of their root under a −5.0 bar water stress was decreased by 30%. Urea-nitrogen pretreatment did not modify the effect of osmotic stress on leaf Ca, Mg and K concentrations, water use or dry matter production during the period of applied water stress. All these parameters decreased with increasing solution osmotic stress.
Authors: I. Gergely, R. F. Korcak, M. Faust
Institution: United States Department of Agriculture
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W2587789975