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Effects of SO2 and salinity on nitrogenase activity, nitrogen concentration and growth of young soybean plants
Journal article   Peer reviewed

Effects of SO2 and salinity on nitrogenase activity, nitrogen concentration and growth of young soybean plants

M. Qifu and F. Murray
Environmental and Experimental Botany, Vol.33(4), pp.529-537
1993
DOI: https://doi.org/10.1016/0098-8472(93)90027-D
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Abstract

Young soybean plants (Glycine max L.) were exposed to three SO2 concentrations (2, 110 and 250 ppb) and two levels of soil salinity (no added NaCl and 27 mM NaCl) in a factorial experiment for 16 days. SO2 exposure was for 5 hr day−1. Exposure to 250 pbb (high) SO2 decreased the number and weight of root nodules, suppressed nitrogenase activity, and reduced shoot and root nitrogen concentrations, whereas 110 ppb (low) SO2 usually had no effect on these parameters. High and low SO2 concentrations increased the shoot-to-root ratios by reducing root growth and stimulating shoot growth, respectively. Soil salinity decreased root nodulation and N-fixation, but it ameliorated SO2-induced injury. Twelve days after exposure to SO2, foliar injury was apparent in the treatment of high SO2 alone but was negligible in the high SO2 and salinity treatment. The reduced SO2 injury under saline conditions was probably achieved by decreasing SO2 uptake through stomatal closure.

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Source: InCites

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33 Record Views
2 Times Cited - Web of Science

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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
Environmental Sciences
Plant Sciences
ESI research areas
Plant & Animal Science
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