The Transpiration Stream and Upward Translocation of Mineral Ions
Creators:O'Leary, James W.
MetadataShow full item record
Citation:The Ohio Journal of Science. v65 n6 (November, 1965), 357-362
Ca46 and P32 were supplied simultaneously to young Phaseolus vulgaris L. seedlings grown in solution. After short periods of uptake, the Ca45/P32 ratios in opposite leaves and opposite leaflets were very similar. This relationship also held when Ca45 and Cs137 were paired. Ca45/P32 ratios in lateral halves of the same leaf were in good agreement, also. However, the basal halves of leaves always had higher Ca4B/P32 ratios than terminal halves. There was a negative acropetal gradient of Ca45/P32 ratio in the stem, but the ratio in the trifoliate leaves was higher than in the primary leaves. When roots were removed prior to supplying the radioisotopes, the Ca45/P32 ratios in the foliage and stems were lower than in plants with roots intact. The data obtained support the en masse flow concept of ion movement through the stem.
Author Institution: Department of Botany, University of Arizona, Tucson
Rights:Reproduction of articles for non-commercial educational or research use granted without request if credit to The Ohio State University and The Ohio Academy of Science is given.
Items in Knowledge Bank are protected by copyright, with all rights reserved, unless otherwise indicated.