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Plant and Cell Physiology, 1979, Vol. 20, No. 1 263-266
© 1979

Short communication

Transformation of atmospheric NO2 absorbed in spinach leaves1

Tadakatsu Yoneyama2 and Hideo Sasakawa3

2Division of Environmental Biology, National Institute for Environmental Studies P. O. Yatabe, Tsukuba, Ibaraki 300-21, Japan
3Department of Agricultural Chemistry, Nagoya University Chikusa-ku, Nagoya, Aichi 464, Japan

NO2 fumigation at 8 ppm of spinach plants resulted in nitrite accumulation in the leaves in the dark but not in the light. When spinach plants were fumigated with 15N-labeled NO2 in the light, amide nitrogen of glutamine, glutamic acid, {gamma}-amino butyric acid and aspartic acid, in this order, were highly labeled with 15N and nitrate was also labeled. These results suggest that NO2-nitrogen (at least some of it) is converted into nitrite and nitrate, and then actively assimilated into amino acids through the glutamine synthetase/glutamate synthase pathway in spinach leaves.

1This work was conducted as a part of the special research project "Studies on evaluation and amelioration of air pollution by plants" (1976–1978) at the National Institute for Environmental Studies.

(Received July 24, 1978; )
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M. Takahashi, Y. Sasaki, S. Ida, and H. Morikawa
Nitrite Reductase Gene Enrichment Improves Assimilation of NO2 in Arabidopsis
Plant Physiology, June 1, 2001; 126(2): 731 - 741.
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