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[SANET-MG] humanized rice that remediates atrazine and simazine
I have concern about growing such humanized rice in open environments.
Not only will the rice remediate atrazine and simazine but it will also
convert other compounds such as air polluting PAH and soil pollutants
into active carcinogens. Even if the rice is not eaten by people will be
consumed by birds and other wildlife.
J. Agric. Food Chem., ASAP Article 10.1021/jf051370f S0021-8561(05)01370-1
Web Release Date: September 30, 2005
Transgenic Rice Plants Expressing Human CYP1A1 Remediate the Triazine
Herbicides Atrazine and Simazine
Hiroyuki Kawahigashi,* Sakiko Hirose, Hideo Ohkawa, and Yasunobu Ohkawa#
Plant Biotechnology Department, National Institute of Agrobiological
Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan; Faculty of
Life Science and Biotechnology, Fukuyama University, Gakuencho 1,
Fukuyama, Hiroshima 729-0292, Japan; and Agriculture, Forestry and
Fisheries Research Council Secretariat, 1-2-1 Kasumigaseki Chiyodaku,
Tokyo 100-8950, Japan
The human cytochrome P450 CYP1A1 gene was introduced into rice plants
(Oryza sativa cv. Nipponbare). One-month-old CYP1A1 plants grown in soil
clearly showed a healthy growth and tolerance to 8.8 M atrazine and 50 M
simazine, but nontransgenic plants were completely killed by the
herbicides. Although transgenic and nontransgenic plants metabolized the
two herbicides into the same sets of compounds, CYP1A1 plants
metabolized atrazine and simazine more rapidly than did control plants.
In small-scale experiments, residual amounts of atrazine and simazine in
the culture medium of CYP1A1 plants were 43.4 and 12.3% of those in
control medium; those of nontransgenic Nipponbare were 68.3 and 57.2%,
respectively. When cultivated in soil with 2.95 M atrazine and 3.15 M
simazine for 25 days, CYP1A1 plants eliminated 1.3 times more atrazine
and 1.4 times more simazine from the soil than did control plants. Thus,
CYP1A1 rice plants make it possible to remove atrazine and simazine more
rapidly from the culture medium and soil than can nontransgenic Nipponbare.
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