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首页> 外文期刊>The New Phytologist >Seasonal fluctuations of selenium and sulfur accumulation in selenium hyperaccumulators and related nonaccumulators
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Seasonal fluctuations of selenium and sulfur accumulation in selenium hyperaccumulators and related nonaccumulators

机译：硒超累积物和相关非累积物中硒和硫累积量的季节性波动

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摘要

Some plants hyperaccumulate selenium (Se) up to 1% of dry weight. This study was performed to obtain insight into whole-plant Se fluxes in hyperaccumulators. Selenium hyperaccumulators Astragalus bisulcatus and Stanleya pinnata were monitored over two growing seasons for seasonal fluctuations in concentrations of Se and the chemically similar element sulfur (S). The related nonhyperaccumulators Astragalus sericoleucus, Oxytropis sericea and Thlaspi montanum were included for comparison. In both hyperaccumulators leaf Se decreased from April to October, coinciding with Se hyperaccumulation in flowers and seeds. Root Se levels were lowest in summer. Selenium concentration decreased with leaf age in both hyperaccumulators. Leaf S levels peaked in summer in all plant species, as did Se levels in nonhyperaccumulators. Selenium and S levels tended to be negatively correlated in hyperaccumulators, and positively correlated in nonhyperaccumulators. These results suggest a specific flow of Se in hyperaccumulator plants over the growing season, from root to young leaves in spring, followed by remobilization from aging leaves to reproductive tissues in summer, and back to roots in the autumn.
机译：一些植物会富集高达干重1％的硒（Se）。进行这项研究的目的是了解超级蓄积物中全植物硒通量。在两个生长季节中监测了硒超富集剂黄芪（Astragalus bisulcatus）和赤松（Stanleya pinnata）的硒和化学相似元素硫（S）浓度的季节性波动。包括相关的非高蓄积性黄芪，绢毛棘豆和褐藻（Thlaspi montanum）进行比较。在这两种超富集植物中，从4月到10月，叶片中的硒含量都下降了，这与花朵和种子中硒的富集程度相吻合。夏季的根硒水平最低。两种超级蓄积剂中硒的含量均随着叶龄的增加而降低。所有植物种类的叶片S含量均在夏季达到峰值，非高蓄积元素中的Se含量也达到峰值。硒和硫水平在超级蓄积物中趋于负相关，而在非超级蓄积物中呈正相关。这些结果表明，在整个生长季节中，硒在超级蓄积植物中有特定的流动，从春季的根部到幼叶，然后在夏季从衰老的叶部迁移到生殖组织，然后在秋天的根部重新迁移。

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