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vol. 4, nr. 1 (2004)
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Some aspects of aquaporin mediated water transport in pea seeds
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Grażyna Plenzler
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Department of Physics, University of Agriculture, ul. Wojska Polskiego 38/42, 60-637 Poznań |
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vol. 4 (2004), nr. 1,
pp. 141-148
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abstract:
Aquaporins are membrane water channels that play fundamental roles in controlling the water contents of cells. An increasing number of aquaporins has been identified on both the vacuolar (tonoplast) and plasma membranes of plant cells. Direct or indirect regulation of aquaporin activity appears to be a mechanism by which plants can control cellular and tissue water movement and adapt to a constantly changing environment. Recent studies have concentrated on the explanation of this mechanism. This paper reports a study, which tends towards recognition of aquaporins role in water flow during pea seeds germination in osmotic stress conditions. It has been observed that the water uptake decreases in the presence of HgCl2, in the germinating medium. That indicates the aquaporins participation in the effect observed because mercuric chloride is known as an inhibitor of water channels. For the seeds germinating in the stress conditions the uptake/loss of water has been found not to be affected by the presence of HgCl2. This result is consistent with the model proposed earlier for cytosolic osmoregulation of water transport activity by aquaporins phosphorylation and dephosphorylation.
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keywords:
membranes, aquaporins (water channels), germination, pea seeds, osmoregulation
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original in:
Polish
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