Nakajima Hiromitsu, Itoh Kiminori
Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogayaku, Yokohama, 240-8501, Japan.
J Plant Res. 2017 Jan;130(1):135-141. doi: 10.1007/s10265-016-0867-3. Epub 2016 Oct 19.
Scopelophila ligulata is known to be a Fe-hyperaccumulator moss; however, its mechanism of accumulation and the effects of Fe on pigments remain unclear. To clarify the effects, we measured its metal and pigment concentrations. The Fe concentration in S. ligulata was 10-61 times higher than that in normal mosses, confirming that the moss is a Fe-hyperaccumulator. The black samples of S. ligulata had the highest Fe concentration (2.9 wt%) and the second in the order of decreasing Fe concentration (2.2 wt%), which explains their color and indicates that the excess amount of Fe is distributed through the plant body. Moreover, we observed that the concentration of Ca is negatively correlated with the concentrations of pigments and, conversely, that the concentration of K is positively correlated with the concentrations of pigments. This inverse relationship between Ca and K can be explained by the reduced uptake of K in S. ligulata in response to Ca stress, which is supported by the fact that the concentration of Ca is negatively correlated with that of K. These findings provide a better understanding of the relationships between metals and pigments in the Fe-hyperaccumulator moss S. ligulata.
已知舌叶藓是一种铁超积累苔藓；然而，其积累机制以及铁对色素的影响仍不清楚。为了阐明这些影响，我们测量了其金属和色素浓度。舌叶藓中的铁浓度比正常苔藓高10 - 61倍，证实该苔藓是铁超积累植物。舌叶藓的黑色样本铁浓度最高（2.9 wt%），按铁浓度递减顺序排第二的样本为2.2 wt%，这解释了它们的颜色，并表明过量的铁分布于整个植物体。此外，我们观察到钙的浓度与色素浓度呈负相关，相反，钾的浓度与色素浓度呈正相关。钙和钾之间的这种反比关系可以通过舌叶藓在钙胁迫下钾吸收减少来解释，钙浓度与钾浓度呈负相关这一事实支持了这一点。这些发现有助于更好地理解铁超积累苔藓舌叶藓中金属与色素之间的关系。
