The effects of root nitrogen supplies on the absorption of atmospheric NO2 by soybean leaves

Z. Qiao; F. Murray

doi:10.1046/j.1469-8137.1997.00730.x

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The effects of root nitrogen supplies on the absorption of atmospheric NO2 by soybean leaves

Journal article

Open access

Peer reviewed

The effects of root nitrogen supplies on the absorption of atmospheric NO2 by soybean leaves

Z. Qiao and F. Murray

New Phytologist, Vol.136(2), pp.239-243

1997

DOI: https://doi.org/10.1046/j.1469-8137.1997.00730.x

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Abstract

Twelve-day-old soybean plants were exposed to atmospheric NO2 (0.3 μl 1-1) and simultaneously supplied, via the roots; with 5 mM or 1 mM of NaNO3 or NH4Cl. After exposure for 7 d, the amount of NO2 absorbed per plant was greater in plants supplied with nitrate than in plants supplied with the same concentration of ammonium. The NO2 AR (absorption rate) decreased with increasing exposure time. At the beginning of exposure, the NO2 AR for all plants was c. 12 mg NO2 h-1 m-2 μl l. On the day 7 of exposure, the NO2 AR declined to 8.46, 8.97, 8;27, and 9.04 mg NO2 h-1 m-2 μl-1 1 for plants receiving 1 mM ammonium, 1 mM nitrate, 5 mM ammonium, and 5 mM nitrate respectively. The plants supplied with nitrate had a higher concentration of leaf nitrate and a higher pH than those supplied with the equivalent concentration of ammonium. These results suggest that the NO2 absorption rate might be attenuated by the accumulation of H+ produced from N uptake and assimilation.

Details

Title: The effects of root nitrogen supplies on the absorption of atmospheric NO2 by soybean leaves
Authors/Creators: Z. Qiao (Author/Creator)
F. Murray (Author/Creator)
Publication Details: New Phytologist, Vol.136(2), pp.239-243
Publisher: Blackwell Publishing
Identifiers: 991005543144507891
Murdoch Affiliation: School of Biological and Environmental Sciences
Language: English
Resource Type: Journal article

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Citation topics: 3 Agriculture, Environment & Ecology; 3.40 Forestry; 3.40.1396 CO2 and Ozone Effects
Web Of Science research areas: Plant Sciences
ESI research areas: Plant & Animal Science