Changes of Photosynthetic and Antioxidant Activity of Phaseolus vulgaris to Potassium
Virgílio Gavicho Uarrota *
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil and Laboratory of Seed Analysis, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Cristiane Segatto
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Camila Pereira Barbosa
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Daicon Godeski Moreira
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Deivid L. V. Stefen
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Emanuel Mattos
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Gustavo Viana Junkes
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Camila Corrêa
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Marcelo Eduardo Tormem
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Maira Maier Bisato
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Cileide Maria Medeiros Coelho
Laboratory of Seed Analysis, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
Clovis Arruda Souza
Laboratory of Crop Plants, Department of Agronomy, Agroveterinary Science Center, Postgraduate Program in Plant Production, University of the State of Santa Catarina, Luiz de Camões Avenue 2090, 88520-000, Lages, Santa Catarina, Brazil.
*Author to whom correspondence should be addressed.
Abstract
Greenhouse experiment was conducted with two cultivars of common beans and four concentrations of potassium (1, 2, 10 and 20 millimolar –mM ) were supplied to the soil pots aiming to access variations in plant antioxidant defense systems (secondary metabolites and enzymatic mechanisms), growth parameters and leaf gas-exchange measurements. The total fresh leaf mass increased in both cultivars from 1 to 10 mM of potassium and the dry matter content decreased from 1 to 20 mM. Root volume significantly increased in Uirapuru cultivar. Potassium increased chlorophyll A in both in the range of 1 to 10 Mm. Catalase activity and carotenoids increased only in Dama cultivar. Potassium increased the photosynthetic activity in cultivar-dependent manner. Cultivar ‘Dama’ showed higher intrinsic water use efficiency, NDVI index, chlorophyll contents, total leaf mass and higher catalase activity. If the selection of cultivar under those traits is aimed, ‘Dama’ cultivar is a candidate and presented a linear stomatal conductance model.
Keywords: Common beans, potassium nutrition, photosynthesis, stomatal conductance models, growth parameters;, antioxidant defense mechanisms, phenolics; normalized vegetative index, catalase