Our Research (Group of Plant Growth Regulation)RECRUIT
This group is a new one, started from April 2008.
Now, 8 members are studying in this laboratory (April, 2014).
We are interested in the regulation mechanism of plant growth under environmental
stresses, which will be studied at cellular, tissue, organ and whole plant
We are now focusing on on aluminum (Al) ion, a major inhibitory factor
of plant growth in acidic soils, and analysis of the mechanisms of Al toxicity
and tolerance, using a cultured cell system and whole plants. Since Al-enhanced
production of reactive oxygen species (ROS) is related to cell death, the
production mechanism of ROS as well as the mechanism of protection from
ROS have been examined, focusing on energy metabolism.
For Al-tolerance mechanism, we isolated wheat ALMT1 gene encoding Al-activated
malate transporter and found to be Al-tolerant as well as acidic-soil tolerant
gene, for the first time in crops. The molecular details of the structure
and functions and the expression mechanism of this transporter are now
In addition, since the ALMT gene and its homologues have been found only
in plants, we are trying to elucidate the functions of individual ALMT
Root growth inhibition in acidic soils is caused by
Compared to neutral soil, plant growth in acidic soils is
inhibited, which is mainly due to Al ion.
In this picture, germinated pea seeds were grown in either acidic soil
(Andisol was used) or neutral soil (control) for 10 days. Compared to the control, growth in the acidic
soil is less in both root and shoot.
Hematoxylin staining indicates the accumulation of Al ion on the root
part grown in acidic soils, but not in neutral soil.
Al ion enhances reactive oxygen species (ROS)
production in roots.
accumulation of Al ion on root surface immediately enhances ROS production. In this picture, root part of pea seedling is
treated hydroponically without (control, right root each time) or with Al (left
root) for up to 12 h. At times
indicated, root parts were stained with fluorescent reagent to detect ROS (shown
with orange color).
Function of ALMT1 and growth of ALMT1-transgenic
barley on acid soil.
gene encodes an Al activated malate transporter that confers Al tolerance to the
plant. The transgenic barley showed a high level Al tolerance on acid
- Contact us
- Prof. Yoko Yamamoto
Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1,
Kurashiki, Okayama 710-0046, Japan
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