文献类型：期刊文献

英文题名：Physiological Responses of Handeliodendron bodinieri (Levl.) Rehd. to Exogenous Calcium Supply under Drought Stress

作者：Leng, Xiuhui[1,2] Xue, Liang[1,3] Wang, Jia[1,3] Li, Sheng[1,3] Yang, Zhiling[1] Ren, Huadong[1] Yao, Xiaohua[1] Wu, Zeyu[1] Li, Jinyao[1]

第一作者：Leng, Xiuhui

通信作者：Li, S[1];Li, S[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Peoples R China;[2]Nanjing Forestry Univ, Inst Forestry, Nanjing 210000, Peoples R China;[3]Observat & Res Stn Rock Desert Ecosyst, Puding 562100, Peoples R China

年份：2020

卷号：11

期号：1

外文期刊名：FORESTS

收录：;EI(收录号：20200508108652);Scopus(收录号：2-s2.0-85078514440);WOS:【SCI-EXPANDED(收录号:WOS:000513184500069)】；

基金：This research was funded by Fundamental Research Funds of CAF (CAFYBB2017MA001, CAFYBB2017ZA002-3), the National Natural Science Foundation of China (31600586), and the National Key R&D Program of China (2016YFC0502605-3).

语种：英文

外文关键词：exogenous calcium; drought stress; physiological response; calcicole; Handeliodendron bodinieri (Levl.) Rehd

摘要：The soils in karst regions, with carbonate rocks as the background material, are characterized by two main factors, drought and high calcium levels. Handeliodendron bodinieri (Levl.) Rehd is an endemic plant species in this area of China. However, few studies have been carried out on the adaptation mechanism of H. bodinieri to drought and high calcium soil. To reveal the physiological responses of H. bodinieri to exogenous calcium under drought stress, 10% PEG-6000 was used to simulate drought stress, and the effects of exogenous calcium at different concentrations on the physiology of H. bodinieri seedlings under drought stress were studied. The results showed that drought stress significantly reduced the relative water content and water potential of H. bodinieri seedlings. Malondialdehyde (MDA) content, O-2- and H2O2 production rates significantly increased under drought stress. The addition of exogenous calcium significantly reduced MDA content and O-2- and H2O2 production rates. Moreover, peroxidase (POD), superoxide dismutase (SOD), catalase (CAT), ascorbic acid peroxidase (APX) and glutathione peroxidase (GPX) activities increased significantly under drought stress. At the same time, the accumulation of osmotic regulators such as soluble sugar, betaine and free proline also increased significantly. The addition of exogenous calcium further increased the activity of antioxidant enzymes and the accumulation of osmotic regulatory substances. Consequently, the oxidative stress and osmotic stress induced by drought decreased. Finally, exogenous calcium enhanced the photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of H. bodinieri under drought stress and significantly improved water use efficiency (WUE). This study confirmed that the application of exogenous calcium can enhance the water condition, photosynthetic capacity, osmotic regulation and antioxidant capacity of H. bodinieri under drought stress. Of the treatments, the 10 mmol.L-1 CaCl2 treatment is more likely to improve survival of H. bodinieri under drought tolerance. This study provides an important reference for describing the adaptation mechanism and appropriate conservation of H. bodinieri under drought and high calcium conditions.