中文摘要：

碱性亮氨酸拉链蛋白（bZIP）作为真核生物中分布最广、最保守的一类转录因子,参与多种生物学过程,尤其在植物抵御各种逆境胁迫中有重要作用。采用RACE和RT-PCR技术克隆到茶树bZIP转录因子基因全长cDNA序列,命名为CsbZIP1（GenBank登录号为JX050148.1）。该基因cDNA全长1515 bp,包含813 bp的完整开放阅读框（ORF）,编码270个氨基酸,预测分子量29.484 kD;含有bZIP家族典型的BRLZ结构域碱性结构域和亮氨酸拉链,属于B-zip1家族;系统发育树分析显示CsbZIP1属于bZIP转录因子F亚家族;亚细胞定位结果表明CsbZIP1主要定位于细胞核;qRT-PCR分析表明,4℃低温和NaCl盐胁迫处理均能诱导CsbZIP1的表达,表达量变化趋势都是随着胁迫时间先逐渐升高,到24 h时降低,ABA胁迫处理24 h抑制CsbZIP1的表达。推测CsbZIP1与茶树低温、盐等逆境胁迫密切相关。

英文摘要：

The basic leucine zipper proteins （bZIP） are one of the most extensive and conserved transcriptional factors families in eukaryotes, and plant bZIPs play important roles in many biological processes, especialy for resisting abiotic stresses. In this study, a bZIP full-length cDNA sequence was cloned using RACE and reverse transcription-PCR（RT-PCR） techniques from tea plant （Camellia sinensis）. The obtained full-length cDNA was named CsbZIP1 with GenBank accession number JX050148.1. It is 1515 bp in length, containing a 813 bp open reading frame （ORF）, encoding 270 amino acid residues with 29.484 kD molecular weight, and containing a typical BRLZ motif （basic region domain and leucine zipper domain） of B-zip1 family. The phylogenetic tree analysis revealed that CsbZIP1 belongs to F subfamily of bZIP. The subcellular location showed that CsbZIP1 protein is located in nucleus. The qRT-PCR analysis indicated that the expression level of CsbZIP1 was up-regulated by cold （4℃） and salt （NaCl） treatments, and both expression amounts increased at first, then declined after 24 hours. However, the expression pattern was down-regulated by ABA treatment within 24 hours. These results demonstrated that CsbZIP1 could be associated with cold and salt stresses in tea plant.