Journal of Jishou University(Natural Sciences Edition)

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Systematic Response Mechanism of Enzyme Removing ROS in Polytrichum Commune During Dehydration and Rehydration

LI Sidi,LI Kegang, HE Mei,WANG Junting   

  1. (1.School of Biology and Environmental Sciences,Jishou University,Jishou 416000,Hunan China;2.Key Laboratory of Plant Resources Conservation and Utilization (College of Hunan Province),Jishou University,Jishou  416000,Hunan China)
  • Online:2017-09-25 Published:2017-11-02


The response mechanism of polytrichum commune in poikilohydrous habitat to reactive oxygen under different dehydration and rehydration stress is explored and its desiccation endurance is investigated.The results show that:(1)the reactive oxygen species accumulate in polytrichum commune with the increase in dehydration time, and the reactive oxygen species(·O-2、H2O2 and OH-) increase to maximum when dehydration lasts 120 mins;(2) the antioxidants SOD、CAT、APX、ASA and GSH increase during dehydration and decrease after rehydration,but GSH and ASA do not recover to the normal level after 120 mins of rehydration;(3)polytrichum commune responds to oxidative stress through ASA-GSH cycle system.It can be concluded that polytrichum commune has good response to oxidative stress caused by dehydration,and its life activity recovers in a very short period of rehydration; this response mechanism enables polytrichum commune survive in poikilohydrous habitat.

Key words: dehydration and rehydration;polytrichum commune;ROS, antioxidants;ASA-GSH cycle

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