文献类型：期刊文献

英文题名：Platycladus orientalis PoKub3 is Involved in Abiotic Stress Responses in Transgenic Arabidopsis

作者：Yao, Xiamei[1,2] Zhang, Jin[1] Ji, Jing[1] Yue, Jianyun[1] Xie, Tiantian[1] Deng, Nan[1] Liu, Jianfeng[1] Shi, Shengqing[1] Jiang, Zeping[1] Chang, Ermei[1]

第一作者：Yao, Xiamei

通信作者：Jiang, ZP[1];Chang, EM[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat State Forestry A, Beijing 100091, Peoples R China;[2]Fuyang Normal Univ, Sch Biol & Food Engn, Fuyang 236037, Anhui, Peoples R China

年份：2017

卷号：60

期号：4

起止页码：322-334

外文期刊名：JOURNAL OF PLANT BIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000407259900005)】；

基金：This work was supported by the National Natural Science Foundation of China [grant number 31300555]; and the Grant for the National Non-Profit Research Institutions of the Chinese Academy of Forestry [grant numbers RIF2013-12, RIF2014-11, CAFYBB2014QB004].

语种：英文

外文关键词：Abiotic stress; Platycladus orientalis; PoKub3; Transgenic Arabidopsis

摘要：Ku70-binding proteins associate with Ku70 and their expression levels can affect DSB repair efficiency via the DNA-PK-dependent repair pathway. However, how Ku70-binding proteins in plants exert a regulatory function under abiotic stress is poorly understood. Here, we cloned and characterized a PoKub3 gene from 500-year-old Platycladus orientalis. With increasing age, PoKub3 expression in P. orientalis increased gradually. The PoKub3 expression levels in leaves were upregulated under salt, heat, UV-C and abscisic acid treatments according to qRT-PCR. Moreover, PoKub3 overexpression in Arabidopsis thaliana improved tolerance to salt and drought stress compared with wild-type (WT) and vector control (VC) plants. High RAB18 and DREB2A expression and low JAZ1 and ABI2 expression provided strong evidence that salt tolerance was enhanced in the overexpression plants. Similarly, high RAB18 and DREB2A expression, accompanied by low JAZ1 and LOX1 expression and high DREB1A, CPK10, GSTF6 and APX1 expression, suggested the drought tolerance mechanism was associated with the abscisic acid pathway. In addition, lower malondialdehyde content, electrolyte leakage and stomatal conductance, and higher soluble sugar and relative water contents in PoKub3 overexpression lines than in WT and VC plants demonstrated its role in salt and drought tolerance. Together, these findings show that PoKub3 positively regulates salt and drought tolerance by regulating stress-related genes.