Introduction and Uptake of Water and Nutrient Ions
Mineral nutrients required for optimal plant growth and development generally exist at a relatively low concentration and show seasonal variation in arable soils. To cope with wide variations in mineral concentrations in soil, plants have evolved mechanisms so that net intake of a nutrient depends on the plant’s need for this element rather than its concentration in the rooting medium.
The plasma membrane of cells contains a large number of pores or channels, which are specific for water, ions or other molecules and restrict any other type to pass through them. Such selectivity is caused by intrinsic transmembrane transporter proteins with fixed topology, lodged inside the channels. Cellular ion channel proteins are large molecules with multiple transmembrane α-helices. Channels alternate between open and closed conformations (gating) and allow water, ions and other molecules to pass through them.
KeywordsIntrinsic Protein Aquaporin Gene Major Intrinsic Protein Plasma Membrane Intrinsic Protein Uncharged Molecule
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