The dynamics of the cytokinin content in detached leaves of wheat (Triticum durum, cv. Bezenchukskaya 139) seedlings moistened with ammonium nitrate or water (control) was studied by immunoenzyme analysis. Leaf treatment with water was accompanied by a transient accumulation of cytokinins, maybe due to their release from their O-glucosylated forms. An increase in the contents of zeatin and its riboside after their initial decrease in detached leaves treated with ammonium nitrate could not occur due to their release from stored forms (nucleotides or O-glucosides) because the contents of zeatin and its riboside increased simultaneously with the content of stored cytokinins. The accumulation of isopentenyladenosine and zeatin nucleotide, which occurred simultaneously with an increase in the content of zeatin and zeatin riboside, permits a supposition that cytokinins can be synthesized in detached wheat leaves treated with ammonium nitrate.
Russian Journal of Plant Physiology – Springer Journals
Published: Mar 20, 2007
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