Nitrogen nutrition and cyto kinin activity in solanum tuberosum

Sattelmacher, B.; Marschner, H.

Physiologia Plantarum 42(2): 185-189

1978


ISSN/ISBN: 0031-9317
DOI: 10.1111/j.1399-3054.1978.tb02545.x
Accession: 005987023

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Abstract
In water culture experiments with potato plants (S. tuberosum L. cv. Ostara), the influence of continuous N nutrition (constant supply of NO3-) and discontinuous N nutrition (interruption of NO3- supply, i.e., N withdrawal for 6 days) on the endogeneous cytokinin level in the roots, shoots and exudate of decapitated plants was studied. Harvests took place at intervals of 3 days. The chlorophyll formation test (cucumber [Cucumis sativus] cotyledons) and soya callus test were used to determine the cytokinin activity. With continuous N, the cytokinin activity decreased slightly with time in both roots and shoots but rose in the exudate. With discontinuous N, the N withdrawal led to a temporary, pronounced increase in cytokinin activity in the roots; at the same time, the cytokinin activity in the exudate decreased sharply. It is assumed that this temporary increase in cytokinin activity in the roots is a reflection of increased meristem activity in the roots. In the shoots, the cytokinin activity decreased during the N withdrawal period. These N-induced changes in cytokinin activity in the roots and shoots of potato should presumably have an important influenece on the physiological age of the shoot, with all its consequences in the further development of the plant. Zeatin riboside was likely the main cytokinin component involved.

Nitrogen nutrition and cyto kinin activity in solanum tuberosum