Plant Physiol. Drug Metab Dispos
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Plant Physiology 61:521-524 (1978)
© 1978 American Society of Plant Biologists

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Articles

Influence of Varied Phosphorus Supply on Growth and Xylem Sap Cytokinin Level of Sycamore (Platanus occidentalis L.) Seedlings

Sukhraj S. Dhillon1

Division of Forestry and Wildlife, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

Effects of varying levels of phosphorus (P) on sycamore (Platanus occidentalis L.) growth and on the endogenous cytokinin levels in the xylem sap were tested. The seedlings were grown in aerated nutrient solutions in the greenhouse. Photoperiod was held constant at 16 hours. Four P concentrations, 0.02, 0.10, 0.50, and 2 mM, were used. There were no P deficiency symptoms even at the lowest P concentration. The maximum growth occurred in seedlings grown in 0.10 mM P. The greatest dry matter yield as well as stem height, stem diameter, and leaf area were produced at 0.10 or 0.50 mM P. The amount of cytokinin in xylem sap for each harvest during P nutrition followed closely the dry matter values, stem height, stem diameter, and leaf area.

1 Present address: Department of Botany, North Carolina State University, Raleigh, North Carolina 27607.






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Copyright © 1978 by the American Society of Plant Biologists