? Protective roles of trehalose in <em>Pleurotus pulmonarius</em> during heat stress response
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    2019, Vol. 18 Issue (02): 428-437     DOI: 10.1016/S2095-3119(18)62010-6
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Protective roles of trehalose in Pleurotus pulmonarius during heat stress response
LIU Xiu-ming*, WU Xiang-li*, GAO Wei, QU Ji-bin, CHEN Qiang, HUANG Chen-yang, ZHANG Jin-xia   
Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affaris/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
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Abstract 
High temperature is one of the major abiotic stresses that limit edible mushroom growth and development.  The understanding of physiological alterations in response to heat stress and the corresponding mechanisms involved is vital for the breeding of heat-resistant edible mushroom strains.  Although trehalose functions as a protectant against abiotic stresses in fungi, the putative role of trehalose in thermotolerance remains to be elucidated.  In this study, we found heat stress inhibited the growth of two Pleurotus pulmonarius strains, heat-sensitive and less-sensitive, and the inhibition was more significant for the sensitive strain.  Heat stress leads to the increase of lipid peroxidation and intracellular trehalose accumulation, with a higher level in the heat-sensitive strain, and this effect is independent of exogenous trehalose application. In addition, a lower concentration of exogenous trehalose application in sensitive strain than in less-sensitive strain was found to alleviate the inhibition of mycelium growth and further increase the intracellular trehalose concentration by heat stress.  Thus, the protective effects of trehalose were more remarkable in the sensitive strain.  The activities of intracellular trehalose metabolic enzymes, i.e., trehalose-6-phosphate synthase, trehalose phosphorylase and neutral trehalase, were determined, and our data indicated that the changes of these enzymes activities in the sensitive strain were more beneficial to accumulate trehalose than that in the less-sensitive strain.
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LIU Xiu-ming
WU Xiang-li
GAO Wei
QU Ji-bin
CHEN Qiang
HUANG Chen-yang
ZHANG Jin-xia
Key wordsedible mushroom     heat stress    Pleurotus pulmonarius     thermotolerance     trehalose     
Received: 2018-01-29; Accepted: 2018-05-07
Fund: This work was supported by the National Basic Research Program of China (2014CB138303) and the earmarked fund for China Agriculture Research System (CARS20). The authors thank the Department of Quality and Safety Test Technology in the Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences for providing the experimental facilities.
Corresponding Authors: Correspondence ZHANG Jin-xia, Tel: +86-10-82108396, Fax: +86-10-82106207, E-mail: zhangjinxia@caas.cn   
About author: LIU Xiu-ming, E-mail: q_lxm@aliyun.com; WU Xiang-li, E-mail: wuxiangli@caas.cn; * These authors contributed equally to this study.
Cite this article:   
LIU Xiu-ming, WU Xiang-li, GAO Wei, QU Ji-bin, CHEN Qiang, HUANG Chen-yang, ZHANG Jin-xia. 2019. Protective roles of trehalose in Pleurotus pulmonarius during heat stress response. Journal of Integrative Agriculture, 18(02): 428-437.
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http://www.chinaagrisci.com/Jwk_zgnykxen/EN/ 10.1016/S2095-3119(18)62010-6      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2019/V18/I02/428
 
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