A transporter regulating silicon distribution in rice shoots

Naoki Yamaji, Namiki Mitatni, Jian Feng Ma

Research output: Contribution to journalArticle

172 Citations (Scopus)

Abstract

Rice (Oryza sativa) accumulates very high concentrations of silicon (Si) in the shoots, and the deposition of Si as amorphous silica helps plants to overcome biotic and abiotic stresses. Here, we describe a transporter, Lsi6, which is involved in the distribution of Si in the shoots. Lsi6 belongs to the nodulin-26 intrinsic protein III subgroup of aquaporins and is permeable to silicic acid. Lsi6 is expressed in the leaf sheath and leaf blades as well as in the root tips. Cellular localization studies revealed that Lsi6 is found in the xylem parenchyma cells of the leaf sheath and leaf blades. Moreover, Lsi6 showed polar localization at the side facing toward the vessel. Knockdown of Lsi6 did not affect the uptake of Si by the roots but resulted in disordered deposition of silica in the shoots and increased excretion of Si in the guttation fluid. These results indicate that Lsi6 is a transporter responsible for the transport of Si out of the xylem and subsequently affects the distribution of Si in the leaf.

Original languageEnglish
Pages (from-to)1381-1389
Number of pages9
JournalPlant Cell
Volume20
Issue number5
DOIs
Publication statusPublished - May 2008

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Silicon
silicon
transporters
rice
shoots
Xylem
leaf blade
Silicon Dioxide
silica
xylem
guttation
Silicic Acid
nodulins
leaves
silicic acid
Aquaporins
aquaporins
Meristem
xylem vessels
biotic stress

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology

Cite this

A transporter regulating silicon distribution in rice shoots. / Yamaji, Naoki; Mitatni, Namiki; Ma, Jian Feng.

In: Plant Cell, Vol. 20, No. 5, 05.2008, p. 1381-1389.

Research output: Contribution to journalArticle

Yamaji, Naoki ; Mitatni, Namiki ; Ma, Jian Feng. / A transporter regulating silicon distribution in rice shoots. In: Plant Cell. 2008 ; Vol. 20, No. 5. pp. 1381-1389.
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