Relationship between transpiration and silica content of the rice [Oryza sativa] panicle under elevated atmospheric carbon dioxide concentration
2007
Takahashi, N.(Tokyo Univ. (Japan)) | Kurata, K.
Silica is distributed in rice plant by the transpiration stream. However, it is unknown the effects of atmospheric carbon dioxide concentration ([CO2]) on silica deposition in the rice plants. In the present study, we investigated the effects of elevated [CO2] on silica contents of the rice plant and focused on the relationships between transpiration rate and silica content of the panicle and leaves under elevated [CO2] at the flowering stage. The rice seedlings were grown hydroponically in two chambers until the flowering stage. The [CO2] in the chambers was maintained at 350 micromol/mol (ambient [CO2]) or 700 micromol/mol (elevated [CO2]). Silica contents of the panicle and the flag leaf under elevated [CO2] significantly decreased compared with those under ambient [CO2] when silica was applied to the culture solution. The transpiration rate of the panicle decreased with increasing panicle silica content under ambient [CO2]. No correlations between transpiration rate and silica content of the panicles and leaves were observed under elevated [CO2].
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