Premium
Nitrogen Nutrition and Cytokinin Activity in Solanum tuberosum
Author(s) -
SATTELMACHER B.,
MARSCHNER H.
Publication year - 1978
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1978.tb02545.x
Subject(s) - cytokinin , exudate , shoot , solanum tuberosum , zeatin , nitrogen , callus , botany , meristem , biology , horticulture , chemistry , auxin , biochemistry , organic chemistry , gene
In water culture experiments with potato plants ( Solanum tuberosum L. cv. Ostara), the influence of continuous nitrogen nutrition (constant supply of NO 3 − ) and discontinuous nitrogen nutrition (interruption of NO 3 − supply, i. e., nitrogen 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 cotyledons) and soya callus test were used to determine the cytokinin activity. With continuous nitrogen, the cytokinin activity decreased slightly with time in both roots and shoots but rose in the exudate. With discontinuous nitrogen, the nitrogen 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 nitrogen withdrawal period. These nitrogen‐induced changes in cytokinin activity in the roots and shoots of potato should presumably have an important influence 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.