Effect of ammonia on sucrose synthase in pea roots

The effects of ammonium on activity of sucrose synthase (SS) in the roots of pea ( Pisum sativum L.) plants were studied. On the medium containing 14.2 mM (NH 4 ) 2 SO 4 , SS activity increased by 20–200% for 10–20 days of plant growth as compared with the roots of plants growing without nitrogen. I...

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Bibliographic Details
Published in:Russian journal of plant physiology 2010, Vol.57 (1), p.69-73
Main Authors: Nikitin, A. V., Bruskova, R. K., Andreeva, T. M., Izmailov, S. F.
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Life Sciences
Plant Physiology
Plant Sciences
Research Papers
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Summary:The effects of ammonium on activity of sucrose synthase (SS) in the roots of pea ( Pisum sativum L.) plants were studied. On the medium containing 14.2 mM (NH 4 ) 2 SO 4 , SS activity increased by 20–200% for 10–20 days of plant growth as compared with the roots of plants growing without nitrogen. Illuminance affected the degree of effects. Under natural illumination, ammonium affected SS activity not only in sunny days (up to 25 klx) but also in cloudy days (3–6 klx) but to a lower degree. Under stable low light (2.5 klx), ammonium did not affect SS activity. In the in vitro experiments, at (NH 4 ) 2 SO 4 concentrations from 0 to 1 mM, SS activity was suppressed (up to 10%), whereas 1–37.5 mM (NH 4 ) 2 SO 4 , it was increased (up to 50%).
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443710010097