We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Effects of HgCl<sub>2</sub> on principal parameters of exudation from maize detached root system.
- Authors
Dustmamatov, A. G.; Zholkevich, V. N.
- Abstract
To elucidate the role of aquaporins in the control of the root pressure, we tested the effects of HgCl2 (aquaporin blocker) at concentrations from 10−8 to 10−2 M on the exudation rate ( J w). Experiments were performed with detached roots of 5–7-day-old etiolated maize ( Zea mays L.) seedlings. HgCl2 suppressed exudation by 50–70% at the concentration of 2 × 10−5 M. At the concentration of 2.5 × 10−4 M, HgCl2 reduced J w during first 20–40 min, but in 2 h, it activated exudation by ten and more times. In this case, the root and osmotic pressures of the exudates increased by 1.5 times. The hydraulic conductance reduced approximately by 30% during first 30 min and increased severalfold in 2 h. The temperature coefficient (Q10) of J w attained 14 in 2 h. At the concentration of 10−2 M, HgCl2-induced acceleration of exudation was replaced by its inhibition essentially immediately. We suggested that a driving force for HgCl2-induced stimulation of the J w might be an increase in the osmotic component of the root pressure or the involvement of its nonosmotic (so-called metabolic) component. The results allow a supposition that aquaporins are involved in the control of water transport in the root.
- Subjects
AQUAPORINS; MEMBRANE proteins; EXUDATION (Botany); PLANT physiology; CORN
- Publication
Russian Journal of Plant Physiology, 2008, Vol 55, Issue 6, p814
- ISSN
1021-4437
- Publication type
Article
- DOI
10.1134/S1021443708060113