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首页> 外文期刊>Acta Physiologiae Plantarum >High tolerance of aluminum in the grass species Cynodon aethiopicus
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High tolerance of aluminum in the grass species Cynodon aethiopicus

机译：草种Cynodon aethiopicus对铝的高耐受性

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Concentrations of aluminum (Al) were determined in leaves of native terrestrial plants, macrophytes and fruit parts (watermelon and tomato) using inductively coupled plasma mass spectrometry. Al concentrations in water and soil were determined by inductively coupled plasma optical emission spectrometry. Potamogeton thunbergii (macrophyte) and Cynodon aethiopicus (terrestrial grass) had the highest leaf Al concentrations (2 and 1 g kg~(-1) dw, respectively). Transfer factors (mg kg~(-1) dw plants/mg kg~(-1) dw soil) based on total Al concentrations in soil varied from 2 × 10~(-3) to 0.05 and from 1.9 to 78 based on mobile Al concentrations determined after sequential extraction. Bioconcentration factors (mg kg~(-1) dw plants/mg L~(-1) water) variedfrom 19 to 9.5 × 103 L kg~(-1) dw. Plants can accumulate high concentrations of Al when growing in neutral pH soils and slightly alkaline lakes in the Ethiopian Rift Valley. Controlled experiments showed that C. aethiopicus can accumulate high levels ofAl both in root and shoot. Compared to Arabidopsis thaliana, C. aethiopicus was more tolerant to Al exposure as >+400 mu M AlCl3 was needed to inhibit root growth compared to 200 μM in A. thaliana. After exposing C. aethiopicus and A. thaliana in 800 mu M AlCl3, alkaline comet assay indicates significant DNA (deoxyribonucleic acid) damage in A. thaliana while C. aethiopicus was unaffected. No significant induction of reactive oxygen species (ROS), in terms of leaf H2O2 levels, could be observed in C.aethiopicus. C. aethiopicus has mechanisms to suppress both Al-induced ROS and DNA damage, thereby increasing tolerance of the species to high Al concentrations.
机译：使用电感耦合等离子体质谱法测定天然陆生植物，大型植物和水果部分（西瓜和番茄）的叶子中铝（Al）的浓度。水和土壤中的铝浓度通过电感耦合等离子体发射光谱法测定。紫花苜蓿（Potamogeton thunbergii）和草拟青狗（Cynodon aethiopicus）（陆地草）具有最高的叶片铝浓度（分别为2和1 g kg〜（-1）dw）。基于土壤中总Al浓度的迁移因子（mg kg〜（-1）dw植物/ mg kg〜（-1）dw植物）从2×10〜（-3）到0.05以及基于移动的1.9至78在连续提取后确定铝浓度。生物富集因子（mg kg〜（-1）dw植物/ mg L〜（-1）水分）从19到9.5×103 L kg〜（-1）dw。在中性pH值土壤和埃塞俄比亚纵谷中的弱碱性湖泊中生长时，植物可以积累高浓度的Al。对照实验表明，aethiopicus可以在根和茎中积累高水平的Al。与拟南芥相比，拟南芥对铝暴露的耐受性更高，因为与拟南芥中的200μM相比，需要> +400μMAlCl3抑制根生长。在将拟南芥和拟南芥暴露于800μMAlCl3中后，碱性彗星试验表明拟南芥中的DNA（脱氧核糖核酸）受到了明显的破坏，而拟南芥不受影响。就叶片中的过氧化氢水平而言，在硫代梭菌中未观察到明显的活性氧（ROS）诱导。 C. aethiopicus具有抑制Al诱导的ROS和DNA损伤的机制，从而增加了物种对高Al浓度的耐受性。

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