Luá Taibo Timpone, Lucas F. Bacci, Renato Goldenberg, Gustavo Habermann
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引用次数: 0
Key message
Miconia predominantly accumulates Al regardless of soil saturation, though certain clades within this high-accumulating group may exhibit distinctly lower Al concentrations in their leaves.
Abstract
In acidic soils (pH < 5.0), aluminum (Al) occurs as Al3+, which is toxic to most plants. Tolerant species include Al avoiders and those that accumulate Al in the leaves without toxicity symptoms. The genus Miconia (Melastomataceae), mainly found in moist forests, includes Al-accumulators from the Cerrado vegetation in South America. To explore Al accumulation, we collected Miconia species in four Atlantic rainforest areas, southeastern Brazil, hypothesizing that soil Al saturation (m%) could explain the leaf Al concentration. Both parameters were measured, and a phylogenetic analysis was conducted among the species to ascertain whether Al accumulation resulted from m% or was species dependent. The 27 species found grow on dystrophic soils with m% above 70%. Despite expecting non-accumulators (reported at 15% in the genus), all 27 species were Al-accumulators, some exceeding 25,000 mg Al kg−1 dry leaf, which did not cluster in any specific group in the phylogenetic analysis. Three species (M. willdenowii, M. brunnea, and M. flammea) might have lost the ability to accumulate Al above 1,500 mg kg−1. When the same species occurred at different sites, m% did not drive Al accumulation. Accumulation of Al in Miconia within the Atlantic rainforest stands at a 20-fold higher accumulation range when compared to Miconia spp. from Cerrado. Leaf Al accumulation in Miconia species within the Atlantic rainforest appears to remain unaffected by m%. Within a group where a high capacity for Al accumulation seems to be prevalent, species in certain clades may exhibit distinctly lower Al concentration in their leaves.
尽管在这个高富集组中的某些分支可能在其叶片中表现出明显较低的铝浓度，但无论土壤饱和度如何，iconia都主要积累铝。在酸性土壤（pH < 5.0）中，铝（Al）以Al3+的形式存在，对大多数植物具有毒性。耐受性物种包括避免铝和那些在叶片中积累铝而没有毒性症状的物种。Miconia属（Melastomataceae）主要分布于潮湿的森林中，包括来自南美洲Cerrado植被的铝蓄积物。为了探索铝的积累，我们在巴西东南部的四个大西洋雨林地区收集了Miconia种，假设土壤Al饱和度（m%）可以解释叶片Al浓度。测量了这两个参数，并对物种进行了系统发育分析，以确定铝的积累是由m%引起的还是物种依赖的。所发现的27种植物生长在营养不良的土壤上，70%以上。尽管预计非积累性（据报道在属中占15%），所有27种都是铝积累者，有些超过25000 mg Al kg−1干叶，在系统发育分析中没有聚集在任何特定的类群中。3个物种（M. willdenwii， M. brunnea和M. flammea）可能已经失去了积累超过1500 mg kg - 1的铝的能力。当同一物种发生在不同地点时，m%不驱动Al积累。与塞拉多的Miconia相比，大西洋雨林中Miconia的Al积累范围高出20倍。大西洋雨林中薇onia物种的叶片铝积累似乎不受m%的影响。在一个群体中，高铝积累能力似乎普遍存在，某些进化支系的物种可能表现出明显较低的叶片铝浓度。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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