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Asplenium ceterach belongs to a group of poikilohydric ferns and it can  recover uninjured from an almost completely dehydrated state. In our study,  short term dehydration (24h) at four different water potentials, resulted in  moderate water loss (partial desiccation) in fern tissue. The main phenolic  acids represented in A. ceterach were chlorogenic (CGA) and caffeic acid (CA)  and their content decreased during the dehydration process. For the first  time, peroxidase (POD) and polyphenol oxidase (PPO) isoforms were determined  in the rustyback fern. The results exhibit the presence of numerous anionic  POD isoforms, with pI ranging from 4.4 to 5.8, but none of the cationic  isoforms was detected. Two PPO isoforms were identified, one anionic with pI  6.3 and one cationic with pI of about 9.0. Short-term dehydration brought  about a remarkable increase in POD and PPO activity using CGA as a substrate.  Changes in enzyme activity and content of substrates during dehydration may  play an important role in the adaptation of the rustyback fern to water  deficit, and increase the overall plant resistance to stress conditions.

Dehydration-related changes of peroxidase and polyphenol oxidase activity in fronds of the resurrection fern Asplenium ceterach L.