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Plant Signal Behav. 2014;9(2):e28033. Epub 2014 Feb 13.

Nitrogen dioxide is a positive regulator of plant growth.

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  • 1Department of Mathematical and Life Sciences; Hiroshima University; Higashi-Hiroshima, Japan.


Atmospheric nitric oxide (NO) and nitrogen dioxide (NO₂) have long been recognized as either detrimental or beneficial for plant development. Recent research has established that NO is a phytohormone. Our present knowledge of the physiological role of NO₂ is incomplete. We do know, however, that exogenous NO₂ positively regulates the vegetative and reproductive growth of plants. We may therefore postulate that NO₂ is a positive growth regulator for plants. We are now in a position to coherently summarize what is known of NO₂ physiology; collated information on the topic is presented here.


cell enlargement; cell proliferation; hormone signaling; nitric oxide signaling; nitrogen dioxide; organ growth; organ size control

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