Laboratory of Plant Cell Biology in Totipotency, Department of Integrated Biosciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba, Japan.
J Plant Res. 2011 Sep;124(5):631-8. doi: 10.1007/s10265-010-0389-3. Epub 2010 Nov 17.
Considerable attention has recently been focused on the use of hyperaccumulator plants for the phytoremediation of soils contaminated with heavy metals. The moss, Scopelophila cataractae (Mitt.) Broth., is a typical hyperaccumulator that is usually observed only in copper-rich environments and which accumulates high concentrations of copper in its tissues. However, many of the physiological processes and mechanisms for metal hyperaccumulation in S. cataractae remain unknown. To address this issue, we examined the mechanisms regulating gemma formation, which is considered the main strategy by which S. cataractae relocates to new copper-rich areas. From this study we found that treatment of S. cataractae with high concentrations of copper suppressed gemma formation but promoted protonemal growth. The suppressive effect was not observed by treatment with heavy metals other than copper. These results suggest the importance of copper-sensitive asexual reproduction in the unique life strategy of the copper moss, S. cataractae.
最近，人们对利用超积累植物进行重金属污染土壤的植物修复给予了极大关注。藓类 Scopelophila cataractae (Mitt.) Broth. 是一种典型的超积累植物，通常只在富含铜的环境中观察到，其组织中积累了高浓度的铜。然而，许多 S. cataractae 中金属超积累的生理过程和机制仍不清楚。为了解决这个问题，我们研究了调节芽胞形成的机制，这被认为是 S. cataractae 重新定位到新的富含铜区域的主要策略。从这项研究中我们发现，用高浓度的铜处理 S. cataractae 会抑制芽胞的形成，但会促进原丝体的生长。用铜以外的重金属处理则不会观察到这种抑制作用。这些结果表明，在铜藓 S. cataractae 独特的生活策略中，铜敏感的无性繁殖非常重要。
