Effects of Cu on the content of chlorophylls and secondary metabolites in the Cu-hyperaccumulator lichen Stereocaulon japonicum.
Effects of Cu on the content of chlorophylls and secondary metabolites in the Cu-hyperaccumulator lichen Stereocaulon japonicum.
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DOI：
10.1016/j.ecoenv.2014.12.038
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发表时间：
2015-03
影响因子：
6.8
通讯作者：
H. Nakajima;K. Hara;Yoshikazu Yamamoto;K. Itoh
中科院分区：
文献类型：
--
作者：
H. Nakajima;K. Hara;Yoshikazu Yamamoto;K. Itoh
了解Cu与Cu超富集地衣之间的关系对其在重金属污染监测和评价中的应用具有重要意义。对日本几个铜污染和控制地的cu超富集地衣进行了调查，发现该地衣分布广泛。测定了其Cu、叶绿素和次生代谢产物浓度、叶绿素相关指标和吸收光谱，发现Cu对这些浓度和指标有负影响。然而，对于高铜污染的样品（干重100 ppm），我们发现Cu和叶绿素浓度之间存在显著的线性相关性。这可以看作是光生物inS的响应。日本铜应力。在高铜污染的样品中，叶绿素相关指数和总次生代谢物浓度几乎不变，与Cu浓度无关。这说明叶绿素浓度随着Cu浓度的增加而增加，提高了单位生物量光合生产力，这将为Cu胁迫下维持叶绿素相关指标提供额外的结构和能量。叶绿素浓度升高与叶绿素浓度升高的关系。地衣次生代谢物浓度的下降可以从地衣中碳水化合物的平衡来解释。我们发现光谱指数a372−a394可以作为Cu和总次生代谢产物inS浓度的有用指标。日本血吸虫。这些结果表明叶绿素和次生代谢产物inS的含量发生了调整。为Cu与Cu超富集地衣之间的关系提供了更好的认识。
Understanding the relationship between Cu and Cu-hyperaccumulator lichens is important for their application in monitoring and assessing heavy metal pollution. We investigated the Cu-hyperaccumulator lichenStereocaulonjaponicumat several Cu-polluted and control sites in Japan, and found the lichen to be widely distributed. Its concentrations of Cu, chlorophylls, and secondary metabolites, chlorophyll-related indices, and absorption spectra were measured, and we observed negative effects of Cu on these concentrations and indices. For highly Cu-polluted samples (>100 ppm dry weight), however, we found significant linear correlations between Cu and chlorophyll concentrations. This can be considered as the response of the photobiont inS. japonicumto Cu stress. In highly Cu-polluted samples the chlorophyll-related indices and concentration of total secondary metabolites were almost constant regardless of Cu concentration. This suggests that the increase in chlorophyll concentration with the increase in Cu concentration enhances photosynthetic productivity per unit biomass, which will allow the production of extra structure and energy for maintaining the chlorophyll-related indices under Cu stress. The relationship between the increase in chlorophyll concentration ofS. japonicumand the decrease in secondary metabolite concentration of the lichen can be explained by considering the balance of carbohydrates in the lichen. We found that a spectral indexA372−A394can be a useful index of the concentrations of Cu and total secondary metabolites inS. japonicum. These findings show the adjustment of the content of chlorophylls and secondary metabolites inS. japonicumto Cu stress, and provide a better understanding of the relationship between Cu and the Cu-hyperaccumulator lichen.