The aquaporin NtAQP1 from Nicotiana tabacum L. is insensitive to heavy-metal ions. In addition to water, the transport of urea or glycerol is facilitated by this plasma-membrane-located water channel. Northern hybridization and whole-mount in situ hybridization revealed a high steady-state level of NtAQP1-RNA in roots, a decreased content in shoots and a low content in leaves. By immunolocalization with an antibody targeted to the N-terminus of the aquaporin, the localization of NtAQP1-protein at sites of expected high water transport rates from and to the apoplast or symplast could be demonstrated. The specific pattern of NtAQP1 distribution in petioles strongly indicates a transcellular movement of water.
Planta – Springer Journals
Published: Jul 14, 2000
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