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- Title
Salicylic acid can regulate phloem unloading in the root tip.
- Authors
Burmistrova, N. A.; Krasavina, M. S.; Akanov, E. N.
- Abstract
In three-day-old maize ( Zea mays L.) seedlings, we removed the endosperm, coleoptile with leaflets, and adventitious roots. Primary roots were exposed to 0–10−3 M salicylic acid (SA) for 1–5 h; scutellum, to 10−2 M 2-desoxy-D-glucose (2dG). 2dG-sucrose synthesized from 2dG was transported from scutella to the roots along the phloem. Its accumulation in 5-mm-long root tips was the measure of phloem unloading. At the concentrations higher than 10−4 M, SA suppressed unloading. Simultaneously, the uptake of 14C-5,5-dimethyloxazolidinedione (DMO) by root segments was inhibited, indicating cytoplasm acidification. 10−3 M SA also inhibited root respiration and growth. The lower SA concentrations (10−5 and 10−6 M) activated unloading under conditions of weak sucrose phloem transport to the root. They did not affect DMO uptake, respiration, and growth. 10−4 M SA stimulated unloading during 1- or 2-h exposure but did not affect it at longer treatments. A dependence of SA action on its concentration and exposure duration implies its involvement in the control of phloem unloading in the root tip.
- Subjects
SALICYLIC acid; PHLOEM; CORN growth; PLANT cells &; tissues; RESPIRATION in plants
- Publication
Russian Journal of Plant Physiology, 2009, Vol 56, Issue 5, p627
- ISSN
1021-4437
- Publication type
Article
- DOI
10.1134/S1021443709050070