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

Qifu, M. and Murray, F. (1993) Effects of SO2 and salinity on nitrogenase activity, nitrogen concentration and growth of young soybean plants. Environmental and Experimental Botany, 33 (4). pp. 529-537.

Link to Published Version: http://dx.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.

Publication Type: Journal Article
Murdoch Affiliation: School of Biological and Environmental Sciences
Publisher: Elsevier
Copyright: © 1993 Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/15279
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