Expression pattern of transcripts encoding water channel-like proteins in Norway spruce (Picea abies)

被引:0
|
作者
Peter Oliviusson
Jan Salaj
Inger Hakman
机构
[1] Stockholm University,Department of Botany
[2] Slovak Academy of Sciences,Institute of Plant Genetics
[3] Kalmar University,Department of Biology and Environmental Science
来源
Plant Molecular Biology | 2001年 / 46卷
关键词
aquaporin; conifer; hybridizations root; tonoplast intrinsinc protein (TIP); vascular tissue;
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学科分类号
摘要
With the aim of identifying cells and tissues with high expression of aquaporins (water channels) or homologous genes in Norway spruce (Picea abies), we report the expression patterns of such transcripts in seedlings, in roots of various ages, and in needles. In situ hybridization experiments with a conserved area of a tonoplast intrinsic protein (TIP) gene from P. abies gave high expression signals in differentiating vascular tissues and in the columella cells of the seedling root cap. High-staining signals were also seen in guard cells and in the bundle sheath cells of needles. Moreover, a slightly increased staining signal was seen in cells forming lateral roots as well as in adventitious roots formed from hypocotyl cuttings. By using PCR-based procedures we also identified a full-length aquaporin-like cDNA (mipr) from roots of two-week old seedlings. Sequence homology analysis of the gene suggests that it belongs to the TIP subgroup within the large MIP (major intrinsic protein) family. A phylogenetic analysis of the plant MIP family, including both plasmamembrane (PIP) and tonoplast intrinsic protein (TIP) from Picea, suggests that MIP subgroups evolved already 330 million years ago, as this is the dating of conifer and angiosperm divergence.
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页码:289 / 299
页数:10
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