西北植物学报2024，Vol.44Issue(1)：13-21,9.DOI:10.7606/j.issn.1000-4025.20230457
荒漠植物花花柴HTR基因家族表达模式及其增强细菌抗逆性分析
Expression pattern of HTR gene family in desert plant Karelinia caspia and its enhancement of bacterial stress resistance
摘要
Abstract
[Objective]The desert plant Karelinia caspia has a broad-spectrum of stress resistance,inclu-ding salt/alkali tolerance and high temperature tolerance,which is a precious natural plant germplasm native to Xinjiang.It has been noted that mining the genes involved in extreme temperature and salt toler-ance of K.caspia as well as analyzing their expression under stress is critical for using these genes to en-hance crop stress resistance,increase yield,and promote the exploration and utilization of the genetic re-sources of the desert plants.[Methods]Potted K.caspia seedlings were subjected to different durations of high temperature(45 ℃),low temperature(4 ℃),and high salt(400 mmol/L Na+)stress.Root,stem,and leaf tissues were collected to analyze the expression of the HTR gene family(KcHTRs)by using RT-PCR and other techniques,and analyze their stress resistance and optimal induction conditions for protein expression by a prokaryotic expression system.[Results](1)Seven of the KcHTR gene family members were screened and cloned from the transcriptomic data obtained from high temperature treat-ments of K.caspia.By constructing prokaryotic expression vectors and inducing expression,cDNA lengths of the KCHTR gene family were determined to be between 708 and 789 bp,and the molecular weights of the expressed protein was between 27 and 29 kD.(2)It was found that the optimal expression system of E.coli BL21 was 0.8 at OD600,IPTG concentration 0.5 mmol/L,and induction time 8-10 h at the optimum temperature of 37 ℃.(3)Recombinant E.coli was treated with simulated high tempera-ture,low temperature and salt stress,and the results showed that KcHTRs enhanced the host tolerance to the stresses to certain extent.[Conclusion]The results showed that KcHTRs has broad-spectrum of stress resistance,mainly extreme temperature,and actively responds to stress conditions.关键词
花花柴/HTR基因/原核表达/耐高温性/耐低温性/耐盐性Key words
Karelinia caspia/HTR genes/pronuclear expression/high temperature resistance/low tem-perature tolerance/salt tolerance分类
农业科技引用本文复制引用
徐靖辰,郭媛,王彦芹..荒漠植物花花柴HTR基因家族表达模式及其增强细菌抗逆性分析[J].西北植物学报,2024,44(1):13-21,9.基金项目
新疆生产建设兵团财政科技计划项目——"强南"科技创新骨干人才项目"沙漠植物花花柴耐高温相关基因的克隆及转化棉花的研究"(2021CB013) （2021CB013）
