Photosynthesis and growth of young “Niágara Branca” vines (Vitis labrusca L.) cultivated in soil with high levels of copper and liming

¹ Agronomist, Masters student, Post-graduation Program in Plant Genetic Resources, Santa Catarina Federal University, Rod. Admar Gonzaga, 1346, CEP 88034-001, Florianópolis, SC, Brazil
² Agronomist, Masters student, Post-graduation Program in Agroecosystems, Santa Catarina Federal University, Rod. Admar Gonzaga, 1346, CEP 88034-001, Florianópolis, SC, Brazil
³ Bioprocess and Biotechnology Engineer, Masters student, Post-graduation Program in Agroecosystems, Santa Catarina Federal University, Rod. Admar Gonzaga, 1346, CEP 88034-001, Florianópolis, SC, Brazil
⁴ Agronomist, Postdoc student, Santa Catarina Federal University, Rod. Admar Gonzaga, 1346, CEP 88034-001, Florianópolis, SC, Brazil
⁵ Agronomist, Postdoc, Professor, Santa Maria Federal University, Campus Universitário, CEP 97105-900, Santa Maria, RS, Brazil
⁶ Agronomist, Ph.D, Professor, Post-graduation Program in Plant Genetic Resources, Santa Catarina Federal University, Florianópolis, SC, Brazil

^a Corresponding author: danielrosa.agro@gmail.com

Abstract

The objective of this study was to evaluate the photosynthetic response and growth of young grape “Niagara Branca” vines grown in soil with high content of Cu and liming. The experiment was conducted in controlled environment with soil subjected to three levels of liming, with 0, 1.5 and 3.0 Mg ha⁻¹ of lime. The effect of additional 50 mg kg⁻¹ Cu in half of soil treatments was evaluated. The CO₂ measurements, assimilation rate, stomatal conductance and transpiration were carried out in the tenth cultivation week using the IRGA equipment (Infrared Gaz Analyzer). Plant height, fresh weight and dry weight, concentration of chlorophyll a, chlorophyll b, total chlorophyll, and carotenoids were measured. For most variables, the Cu had damaging effect on 0 and 1.5 Mg ha⁻¹ liming treatments however, there was no significant damage in the 3.0 Mg ha⁻¹ treatment. Rates of CO₂ assimilation, stomatal conductance, and transpiration were increased with the addition of 50 mg kg⁻¹ Cu. Liming to raise the pH of the soil is an effective practice to reduce the effects of Cu toxicity in young “Niagara Branca” grape vines.