ISHS Acta Horticulturae 226: International Symposium on Propagation of Ornamental Plants
ENVIRONMENTAL FACTORS INFLUENCING FOLIAR ABSORPTION OF PHOSPHORUS AND RUBIDIUM BY ROOTED CUTTINGS OF CHRYSANTHEMUM AND PILEA |
| Authors: | S. Marczynski, H.B. Tukey Jr |
| Abstract:
Cuttings of Chrysanthemum morifolium 'Indianapolis White' and Pilea cadierei were rooted under intermittent water mist for 2 weeks. Rooted cuttings were grown in Hoagland's solution in growth chambers and leaves were treated with rubidium phosphate double - labeled with 33P and 86Rb. With all variables teasted, uptake and translocation of Rb was much greater than P. Absorption of both P and Rb through the lower surface was 8 times greater than through upper surface, especially with Pilea. Light had a greater effect upon uptake of both P and Rb by Chrysantthemum than by Pilea. Uptake through both surfaces increased as light intensity increased. Generally the greatest increase in uptake was between the dark and 900 lux treatment but significant increases in uptake were shown even between the dark and 100 lux treatment in some cases. A rise in light intensity between 2700 lux and 25000 lux dit not change uptake at all. Day length generally had a lesser influence on ion uptake, but there were some significant differences. Air humidity differentially affected the folian absorption of 33P and 86Rb by Chrysanthemum and Pilea. As the relative humidity increased from 47% RH to 80% RH in most cases, there was an increase in uptake. Further raising of humidity to 92% increase uptake of Rb and P by Chrysanthemum leaves only when guttation did not occured. Air humidity influenced the most strongly uptake of Ca-phosphate probably due to its low solubility. | |
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