Photosynthesis and nitrogen fixation in soybean exposed to nitrogen dioxide and carbon dioxide

Journal Article · · Journal of Environmental Quality; (United States)

DOI:https://doi.org/10.2134/jeq1992.00472425002100040016x· OSTI ID:6825160

Gupta, G; Li, Yuncong; Sandhu, R ^[1]

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1. Univ. of Maryland Eastern Shore, Princess Anne (United States)

Williams-82 Soybean plants, at the flowering stage, were exposed to NO[sub 2] (0.1 [mu]mol mol[sup [minus]1], 7 h d[sup [minus]1]) and CO[sub 2] (450 [mu]mol mol[sup [minus]1], 12 h d[sup [minus]1]) for 5 d singly and in combination in open-top field chambers. The rate of photosynthesis (PN), specific root nodule nitrogenase activity (SNA), and leaf N were measured after exposure using the LICOR 6200 Portable Photosynthesis system, the acetylene-ethylene reduction method, and the Kjeldahl digestion, respectively. The plants exposed to NO[sub 2] (with 350 [mu]mol mol[sup [minus]1] CO[sub 2]) showed significantly higher PN, SNA, and N compared with the control plants. The SNA and N were reduced, with no change in PN on exposing the plants to CO[sub 2] (in the absence of NO[sub 2]). When the plants were exposed to a combination of these two gases, SNA was increased but the PN and N did not change. The stimulatory effect of NO[sub 2] was reduced by the inhibitory impact of CO[sub 2] on the parameters studied. 78 refs., 2 tabs.

• OSTI ID: 6825160
• Journal Information: Journal of Environmental Quality; (United States), Vol. 21:4; ISSN 0047-2425
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
CARBON DIOXIDE
BIOLOGICAL EFFECTS
NITROGEN DIOXIDE
SOYBEANS
CARBON DIOXIDE FIXATION
NITROGEN FIXATION
PHOTOSYNTHESIS
AIR POLLUTION
DOSE-RESPONSE RELATIONSHIPS
PLANT GROWTH
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
FOOD
GROWTH
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
POLLUTION
SYNTHESIS
VEGETABLES
553000* - Agriculture & Food Technology