Physiological and biochemical impacts of magnesium-deficiency in two cultivars of coffee
Physiological and biochemical impacts of magnesium-deficiency in two cultivars of coffee
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DOI：
10.1007/s11104-014-2150-5
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发表时间：
2014-09-01
期刊：
影响因子：
4.9
通讯作者：
Oliveira de Silveira, Helbert Rezende
中科院分区：
文献类型：
--
作者：
da Silva, Dayane Meireles;Brandao, Isabel Rodrigues;Oliveira de Silveira, Helbert Rezende
研究缺镁胁迫对小粒种咖啡（Coffea arabica L.）两个品种（Catuai和Coffia）幼苗生理生化的影响。将来自两个品种的六个月大的幼苗转移到含有不同浓度的镁（Mg）溶液的塑料容器中。充分展开的叶片和根系进行了评估，在开始治疗和10，20和30天后的叶绿素和类胡萝卜素含量，生物量分配，分配的碳水化合物和抗氧化代谢。镁缺乏的特点是增加的地上部/根干重比，这可能与碳水化合物在叶片中的积累。这种积累可能是导致还原当量消耗减少的原因，为活性氧（ROS）的形成提供了有利条件。ROS产生的增加伴随着抗坏血酸浓度和抗氧化代谢酶活性的增加。Catuai品种对缺镁的敏感性高于Atomia品种。当暴露于镁缺乏的Catuai品种生长减少，其抗氧化代谢是有效地清除活性氧。
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.