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Position: Home > Articles > Cloning of EgrCBF1 and EgrCBF2 Genes from Eucalyptus grandis and their Expression under Stresses Scientia Silvae Sinicae 2012,48 (10) 41-48

巨桉EgrCBF1和EgrCBF2基因的克隆和胁迫响应表达分析

作  者:
王京京;童再康;黄程前;程龙军
单  位:
浙江农林大学亚热带森林培育国家重点实验室培育基地
关键词:
巨桉;CBF;冷;ABA;干旱;高盐
摘  要:
从低温诱导的巨桉幼苗中克隆到2条CBF的全长cDNA序列,命名为EgrCBF1和EgrCBF2,全长分别为1062bp和1203bp,编码220个氨基酸和196个氨基酸,命名为EgrCBF1和EgrCBF2(GenBank登录号分别为:JQ068827;JQ068828),都包含1个AP2结构域。2个基因编码的蛋白都与冈尼桉中CBF蛋白(DQ241820)具有很高的同源性,与EguCBF1a的同源性分别达到了91%和80%。RT-PCR分析表明,EgrCBF1主要在叶和根中表达,而EgrCBF2在叶、茎和根中都有表达。对不同低温条件(0,2,4,6,8℃)和4℃2,4,8,24,48h处理下EgrCBF1和EgrCBF2的qRT-PCR分析表明:2个基因都受低温诱导,并在2℃时诱导水平达到最高;4℃下随低温时间的延长,它们的诱导表达特性都呈先升后降的趋势。在100μmol·L-1 ABA,200mmol·L-1 NaCl和干旱处理下,EgrCBF1受ABA和干旱诱导,EgrCBF2则受干旱和高盐胁迫诱导。
译  名:
Cloning of EgrCBF1 and EgrCBF2 Genes from Eucalyptus grandis and their Expression under Stresses
作  者:
Wang Jingjing Tong Zaikang Huang Chengqian Cheng Longjun(The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Zhejiang A & F University Lin'an 311300)
关键词:
Eucalyptus grandis;CBF;cold;ABA;drought;salt
摘  要:
Two CBF genes named EgrCBF1 and EgrCBF2(GenBank No.JQ068827;JQ068828)were isolated from Eucalyptus grandis seedlings under low temperature.Sequence analysis showed that EgrCBF1 and EgrCBF2 cDNA had 1 062 bp and 1 203 bp,respectively.The two genes encoded 220 and 196 amino acids,separately and both contained an AP2 domain.The results of homology comparison showed that EgrCBF1 and EgrCBF2 protein shared 91% and 80% homology with EguCBF1a.Spatial expression analyses showed that EgrCBF1 expressed mainly in leaves and roots while EgrCBF2 expressed in all leaves,stems and roots.qRT-PCR result of EgrCBF1 and EgrCBF2 under 0 ℃,2 ℃,4 ℃,6 ℃,and 8 ℃ revealed that they were both induced by low temperatures and reached the highest level at 2 ℃.Time course of the genes expressions at 4 ℃ for 2 h,4 h,8 h,24 h,and 48 h showed that their expressions increased at the first and then decreased.Changes in EgrCBF1 and EgrCBF2 expression under 100 μmol·L-1ABA,200 mmol·L-1NaCl and drought were also analyzed.The results showed EgrCBF1 was up-regulated under drought stress and ABA treatment,while the expression of EgrCBF2 increased under drought and salt stress.

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