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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

Abstract:

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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