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Is there a relationship between water use efficiency and soil carbon dioxide emissions in soybean genotypes?
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1  Agronomy departament, Federal University of Mato Grosso do Sul, Campus de Chapadão do Sul, Mato Grosso do Sul, Brazil
Academic Editor: Dilantha Fernando

Abstract:

Selecting water-use-efficient (WUE) soybean genotypes is one of the main strategies of addressing climate change. Understanding soil carbon dioxide emissions is important for identifying production systems with plants that are more adapted to climate change, meeting Sustainable Development Goals 12 (responsible consumption and production) and 13 (climate action). This study aimed to verify whether there is a relationship between water use efficiency in soybean genotypes and soil carbon dioxide emissions (FCO2). Twenty-five soybean genotypes were evaluated in a randomized block design with three replicates. At 60 days after crop emergence, the following variables were evaluated in each experimental unit: net photosynthesis (A, mmol CO2 m-2 s-1), transpiration (E, mmol H2O m-2 s-1), and FCO2. The WUE was calculated by the ratio between A and E evaluated in three plants of each plot using an infrared gas analyzer (IRGA Li-6400XT) and was assessed using the portable EGM-5 system. Initially, the data were subjected to analysis of variance and grouping of means. Subsequently, the data were subjected to Pearson’s correlation. There was a significant difference between the soybean genotypes for the variables evaluated. The correlation between WUE and FCO2 is of low magnitude. However, it is possible to select genotypes with higher WUE and lower FCO2. The results reported here may guide selection strategies in soybean breeding programs.

Keywords: Glycine max L. Merril; climate change; plant physiology
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