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Plant Physiol, December 2001, Vol. 127, pp. 1773-1780
Role of Root Hairs and Lateral Roots in Silicon Uptake by
Rice
Jian Feng
Ma,*
Shoko
Goto,
Kazunori
Tamai, and
Masahiko
Ichii
Faculty of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho,
Kita-gun, Kagawa 761-0795, Japan
The rice plant (Oryza sativa L. cv Oochikara)
is known to be a Si accumulator, but the mechanism responsible for the
high uptake of Si by the roots is not well understood. We investigated the role of root hairs and lateral roots in the Si uptake using two
mutants of rice, one defective in the formation of root hairs (RH2) and
another in that of lateral roots (RM109). Uptake experiments with
nutrient solution during both a short term (up to 12 h) and relatively long term (26 d) showed that there was no significant difference in Si uptake between RH2 and the wild type (WT), whereas the
Si uptake of RM109 was much less than that of WT. The number of silica
bodies formed on the third leaf in RH2 was similar to that in WT, but
the number of silica bodies in RM109 was only 40% of that in WT, when
grown in soil amended with Si under flooded conditions. There was also
no difference in the shoot Si concentration between WT and RH2 when
grown in soil under upland conditions. Using a multi-compartment
transport box, the Si uptake at the root tip (0-1 cm, without lateral
roots and root hairs) was found to be similar in WT, RH2, and RM109.
However, the Si uptake in the mature zone (1-4 cm from root tip) was
significantly lower in RM109 than in WT, whereas no difference was
found in Si uptake between WT and RH2. All these results clearly
indicate that lateral roots contribute to the Si uptake in rice plant,
whereas root hairs do not. Analysis of F2 populations
between RM109 and WT showed that Si uptake was correlated with the
presence of lateral roots and that the gene controlling formation of
lateral roots and Si uptake is a dominant gene.
*
Corresponding author; e-mail maj{at}ag.kagawa-u.ac.jp; fax
81-87-891-3137.
© 2001 American Society of Plant Physiologists
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