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

机译：两种咖啡品种中镁缺乏的生理生化影响

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摘要

To evaluate biochemical and physiological impacts of magnesium-deficiency on seedlings of two cultivars (Catuai and Acaia) of Coffea arabica L.. 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. 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. The Catuai cultivar is more sensitive to Mg-deficiency than the Acaia cultivar. When exposed to magnesium deficiency the Catuai cultivar had reduced growth and its antioxidant metabolism was less efficient at removing ROS
机译：为了评估缺镁对阿拉伯咖啡的两个品种（Catuai和Acaia）幼苗的生化和生理影响。将两个品种的六个月大的幼苗转移到装有不同浓度镁（Mg）溶液的塑料容器中。在处理开始时以及在10、20和30天后评估完全膨胀的叶和根的叶绿素和类胡萝卜素含量，生物量分配，碳水化合物分配和抗氧化剂代谢。缺镁的特征是茎/根干重比增加，这可能与叶片中碳水化合物的积累有关。这种积累可能是引发减少还原当量消耗的原因，为形成活性氧（ROS）提供了有利条件。 ROS产生的增加伴随着抗氧化剂代谢中抗坏血酸浓度和酶活性的增加。 Catuai品种比Acaia品种对缺镁更为敏感。当暴露于镁缺乏时，Catuai品种生长减慢，其抗氧化代谢去除ROS的效率降低

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