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Water use efficiency and photosynthesis of glyphosate-resistant soybean as affected by glyphosate
Authors:Luiz Henrique Saes Zobiole  Rubem Silvério de Oliveira Jr  Jamil Constantin  Antonio Saraiva Muniz
Institution:a Center for Advanced Studies in Weed Science (NAPD), State Univ. of Maringá, Colombo Av., 5790, 87020-900 Maringá, PR, Brazil
b United States Department of Agriculture, Agricultural Research Service, Cropping Systems and Water Quality Research Unit, Columbia, MO 65211, USA
c Biology Department, State Univ. of Maringá, Colombo Av., 5790, 87020-900 Maringá, PR, Brazil
d Agronomy Department, State Univ. of Maringá, Colombo Av., 5790, 87020-900 Maringá, PR, Brazil
Abstract:Previous studies comparing cultivars of different maturity groups in different soils demonstrated that early maturity group cultivars were more sensitive to glyphosate injury than those of other maturity groups. In this work, we evaluated the effect of increasing rates of glyphosate on water absorption and photosynthetic parameters in early maturity group cultivar BRS 242 GR soybean. Plants were grown in a complete nutrient solution and subjected to a range of glyphosate rates either as a single or sequential leaf application. Net photosynthesis, transpiration rate, stomatal conductance, sub-stomatal CO2, carboxylation efficiency, fluorescence, maximal fluorescence and chlorophyll content were monitored right before and at different stages after herbicide application; water absorption was measured daily. All photosynthetic parameters were affected by glyphosate. Total water absorbed and biomass production by plants were also decreased as glyphosate rates increased, with the affect being more intense with a single full rate than half the rate applied in two sequential applications. Water use efficiency (WUE) was significantly reduced with increasing rates of glyphosate.
Keywords:Glyphosate-resistant soybean  Glyphosate  Physiology  Photosynthesis  Chlorophyll  Water use efficiency  Water absorption
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