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Response of soybean glycine max cultivar hodgson to low concentrations of ozone ii. effects on growth biomass allocation and flowering



Response of soybean glycine max cultivar hodgson to low concentrations of ozone ii. effects on growth biomass allocation and flowering



Journal of Environmental Quality 15(2): 161-167



Soybean plants were subjected to ozone (O2) and water stress to determine whether the two stresses interact to alter growth. Potted soybean (Glycine max [L.] Merrill cv. Hodgson) plants were exposed to O3 for 6.8 h daily in four controlled environment chambers. The air supply to the chambers was filtered, and constant amounts of O3 were added: 0.01, 0.05, 0.09, or 0.13 .mu.L L-1. Within each O3 treatment, half of the plants were watered daily and half had water withheld 2 or 3 d per week. At 2-week intervals plants were harvested and divided into leaves, stems and roots. Exposure to increasing concentrations of O3 resulted in a linear decline in growth, but did not influence the allocation of biomass to roots, stems, and leaves. Ozone also delayed the onset of flowering. Weekly water stress periods of 2 or 3 d duration significantly inhibited the growth of soybean but did not alter the allocation of biomass or delay the onset of flowering. Water stress acted to close stomates and reduce the effective O3 dose which resulted in a reduced percent reduction in growth that could be attributed to O3 stress.

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