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

doi:10.3969/j.cnki.jdxb.2017.05.013

Abstract

Abstract:

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

LI Sidi，LI Kegang, HE Mei，WANG Junting. Systematic Response Mechanism of Enzyme Removing ROS in Polytrichum Commune During Dehydration and Rehydration[J]. Journal of Jishou University（Natural Sciences Edition), DOI: 10.3969/j.cnki.jdxb.2017.05.013.

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