Recovery of photosynthesis,sucrose metabolism,and proteolytic enzymes in Kandelia obovata from rare cold events in the northernmost mangrove,China  

作　　者：Chunfang Zheng Yong Ye Weicheng Liu Jianwu Tang Chengnian Zhang Jianbiao Qiu Jinong Chen 

机构地区：[1]Wenzhou Ocean Research Institute,Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-resource,Zhejiang Mariculture Research Institute,Wenzhou 325000,China [2]Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem,College of the Environment and Ecology,Xiamen University,Xiamen,China [3]Nanji Islands National Marine Nature Reserve Administration,Pingyang,China [4]Wenzhou Vocational College of Science and Technology,Wenzhou,China

出　　处：《Ecological Processes》2016年第1期108-119,共12页生态过程（英文）

基　　金：funded by projects of special Funding for Research of National Oceanic Public Service Industry(201505028);Zhejiang Provincial Natural Science Foundation(LQ13C030002);Science and Technology Plan Zhejiang Province(2012C12017-3,2013C25096,2014F50003);Zhejiang Province pelagic fishery(2015)“Cooperation and exchange of aquaculture technology between China and Israel based on the level of ecological system,”and Wenzhou Municipal Science。

摘　　要：Introduction:Understanding how mangroves respond to rare cold events has implications for both restoration and conservation under climate change scenarios.This study investigated the responses of photosynthesis and activities of key enzymes involving carbon and nitrogen metabolism at different ages of Kandelia obovata to a rare cold event in the winter of 2010.Methods:This study took place on Ximen Island,Zhejiang Province,China.We measured the physiological recovery of 2-3-,5-6-,9-10-and 54-55-year-old K.obovata trees after freezing injury in February and March in 2011 and 2012,respectively.Results:Chilling injury index and electrolyte leakage of K.obovata increased with increasing tree age in the winter of 2010,and electrolyte leakage in K.obovata at different ages in the winter of 2010 was far higher than that in the winter of 2011.The rare cold events significantly changed the recoveries of the leaf net photosynthetic rate(Pn)and stomatal conductance(Gs);ratios of chlorophyll a/chlorophyll b(Chl a/Chl b);contents of total soluble sugar(TSS),sucrose,free amino acid(FAA),and soluble protein;and activities of sucrose phosphate synthase(SPS),endopeptidase,and carboxypeptidase in K.obovata at different ages.These effects were mainly due to changes in the physiological mechanism in the 2-year-old trees.A clear decrease in Pn of the 2-year-old trees was observed in February 2011,as exemplified by reductions in ratios of Chl a/Chl b and chlorophyll/carotenoid(Chl/Car),as well as inhibition of the levels of TSS and FAA(osmotic substances).During recovery in 2011 and 2012,the activities of SPS and sucrose synthase(SS)were responsible for sucrose synthesis after the rare cold events in 2011,but only SPS activity was one of the main factors contributing to the metabolism of stachyose to sucrose without cold damage in 2012.Carboxypeptidase played a more important role than endopeptidase during protein hydrolysis after the rare cold events.Conclusions:The results suggest that the recovery of photosynthetic capacity in K.ob

关 键 词：Kandelia obovata PHOTOSYNTHESIS Sucrose synthase Rare cold events PEPTIDASE 

分 类 号：F42[经济管理—产业经济]