Physiological and biochemical impacts of magnesium-deficiency in two cultivars of coffee

• Published in: Plant and soil Vol. 382; no. 1-2; pp. 133 - 150
• Main Authors: Meireles da Silva, Dayane, Brandão, Isabel Rodrigues, Alves, Jose Donizeti, de Santos, Meline Oliveira, de Souza, Kamila Rezende Dázio, de Silveira, Helbert Rezende Oliveira
• Format: Journal Article
• Language: English
• Published: Cham Springer-Verlag 01.09.2014; Springer; Springer International Publishing; Springer Nature B.V
• Subjects: Agricultural research; Agricultural soils; Agronomy. Soil science and plant productions; Animal, plant and microbial ecology; antioxidant activity; Antioxidants; Biochemistry; Biological and medical sciences; Biomass; Biomedical and Life Sciences; Carbohydrates; carotenoids; Chlorophyll; Chlorophylls; Coffea arabica; Coffee; Cultivars; dry matter partitioning; Ecology; Enzymatic activity; enzyme activity; Enzymes; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Genetics and breeding of economic plants; Health aspects; Leaves; Life Sciences; Magnesium; Magnesium in the body; metabolism; Oxidative stress; Physiology; Plant Physiology; Plant roots; Plant Sciences; Plant-soil relationships; Plants; plastics; reactive oxygen species; Regular Article; roots; Seedlings; shoots; Soil Science & Conservation; Soil-plant relationships. Soil fertility; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Sugars; Chlorophyll; Oxidative stress; Biomass allocation; Carbohydrate partitioning; Partition; Biochemical compound; Biochemistry; Alkaline earth metal; Biomass; Coffee; Partitioning; Photosynthetic pigment; Carbohydrate; Physiology; Magnesium; Soil plant relation; Cultivar
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/s11104-014-2150-5

AIM: To evaluate biochemical and physiological impacts of magnesium-deficiency on seedlings of two cultivars (Catuaí and Acaiá) of Coffea arabica L.. METHODS: Six month old seedlings from both cultivars were transferred to plastic receptacles containing solutions with different concentrations of magnesium (Mg). Fully expanded leaves and roots were evaluated at the beginning of treatment and after 10, 20 and 30 days for chlorophyll and carotenoid content, biomass allocation, partitioning of carbohydrates and antioxidant metabolism. RESULTS: Mg-deficiency was characterized by an increase in the shoot/root dry weight ratio, which may be related to accumulation of carbohydrates in leaves. This accumulation is probably responsible for triggering a reduction in the consumption of reducing equivalents, providing favorable conditions for the formation of reactive oxygen species (ROS). The increase in ROS production was accompanied by increases in ascorbate concentration and enzyme activity of the antioxidant metabolism. CONCLUSIONS: The Catuaí cultivar is more sensitive to Mg-deficiency than the Acaiá cultivar. When exposed to magnesium deficiency the Catuaí cultivar had reduced growth and its antioxidant metabolism was less efficient at removing ROS.