title: A cooperative system of silicon transport in plants.
abstract: The high accumulation of silicon (Si) protects plants from biotic and abiotic stresses. Two different types of Si transporter [Low Silicon 1 (Lsi1) and 2 (Lsi2)] involved in the uptake and distribution of Si have been identified. Lsi1, a Si permeable channel, belongs to the Nod26-like major intrinsic protein (NIP) III subgroup of the aquaporin membrane protein family with a distinct selectivity, whereas Lsi2, an efflux Si transporter, belongs to an uncharacterized anion transporter family. These transporters are localized to the plasma membrane, but, in different plant species, show different expression patterns and tissue or cellular localizations that are associated with different levels of Si accumulation. A recent mathematical modeling study revealed that cooperation of Lsi1 and Lsi2, which show a polarized localization, is required for the efficient transport of Si in rice.
authors.affiliation: Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046, Japan. Electronic address: maj@rib.okayama-u.ac.jp.
authors.forename: Jian Feng
authors.initials: JF
authors.lastname: Ma
authors.affiliation: Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Yamaji
mesh_terms: D001692:Biological Transport; D002352:Carrier Proteins / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D012825:Silicon / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D002352:Carrier Proteins; D010940:Plant Proteins; D012825:Silicon
keywords: distribution; efflux; influx; silicon; stress tolerance; uptake