Does Parmelina tiliacea lichen photosystem II survive at liquid nitrogen temperatures?

详细信息    查看全文

• 作者：Abdallah Oukarroum^a ; ^b ; ^{oukarroum.abdallah@uqam.ca} ; ^{abdallah.oukarroum@gmail.com} ; Mohamed El Gharous^a ; Reto J. Strasser^b
• 关键词：Parmelina tiliacea ; Liquid nitrogen ; Dry and wet state ; Chlorophyll a fluorescence rise
• 刊名：Cryobiology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：74
• 期：Complete
• 页码：160-162
• 全文大小：500 K
• 卷排序：74

文摘

Parmelina tiliacea lichens kept in the wet and dry state were stored in liquid nitrogen for 1 week and the subsequent recovery of their photosynthetic apparatus was followed. The chlorophyll a fluorescence rise and the maximum quantum yield of primary photochemistry φPo (FV/FM) were analysed for this purpose. Storage of wet thalli for 1 week in liquid nitrogen led to an impairment of photosystem II and probably the photosynthetic apparatus as a whole, from which the thalli did not recover over time. Thalli exposed in the dry state thalli were far less affected by the treatment and recovered well. These results indicate that the thalli are extremely tolerant to liquid nitrogen temperatures only in the dry state.