Ultraviolet-absorbing scytonemin and mycosporine-like amino acid derivatives in exposed, rock-inhabiting cyanobacterial lichens
Ultraviolet-absorbing scytonemin and mycosporine-like amino acid derivatives in exposed, rock-inhabiting cyanobacterial lichens
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DOI：
10.1007/s004420050296
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发表时间：
1997-10-01
期刊：
影响因子：
2.7
通讯作者：
GarciaPichel, F
中科院分区：
文献类型：
--
作者：
Budel, B;Karsten, U;GarciaPichel, F
本文首次报道了从产自强光生境的Collema属、Gonohymenia属和Peltula属的蓝藻地衣中检出丝胞胺和真菌孢素-甘氨酸等紫外线吸收物质。除了具有丝状褐藻的Collema外，所有其他蓝藻生物都属于单细胞的Chroococcidiopsis、Cyanosarcina、Gloeocapsa或Myxosarcina。从透射电镜研究可以明显看出，色素沉着（丝胞浆蛋白）位于细胞外，位于外菌体部分的鞘中。荧光显微镜和微探针测量清楚地显示了紫外线辐射进入地衣菌体，因此紫外线防晒霜与保护生物体的相关性。
The occurrence of ultraviolet (UV)-absorbing substances like scytonemin and mycosporine-glycine is reported for the first time from cyanobacterial lichens of the genera Collema, Gonohymenia and Peltula, all coming from high-light intensity habitats. Except for Collema with the filamentous Nostoc, all other cyanobionts belong to the unicellular genera Chroococcidiopsis, Cyanosarcina, Gloeocapsa or Myxosarcina. From transmission electron microscope studies it is evident that the pigmentation (scytonemin) is located extracellularly in the sheath of the outer thallus parts. Fluorescence microscopy and microprobe measurements clearly show UV radiation into the lichen thallus and hence the relevance of UV sunscreens for the protection of the organism.