甘蔗乙烯受体Sc-ERS启动子的克隆与序列分析

【目的】克隆甘蔗乙烯受体Sc-ERS基因启动子序列，分析Sc-ERS基因启动子序列的作用元件。【方法】采用基于热不对称交错式PCR原理的染色体步移技术，从甘蔗ROC22基因组DNA中克隆Sc-ERS基因启动子序列，利用启动子预测软件PlantCARE和PLACE在线工具对Se-ERS启动子序列的作用元件进行预测。【结果】克隆获得sc．ERS启动子序列1410bp，该序列与玉米ERS25、ERS14核苷酸同源性分别为82％和80％。PlantCARE在线分析结果表明，该序列具有启动子基本作用元件TATA．BOX和CAAT—BOX，还含有参与光响应元件、干旱诱导MYB结合位点、茉莉酸甲酯响应元件、水杨酸响应元件、胚乳表达顺式调控元件、热胁迫响应元件等。【结论】从甘蔗基因组DNA中克隆获得乙烯受体Sc-ERS基因上游1410bp的启动子序列，该序列含有多个特异性调控元件，推测sc．ERS；~因的表达可能受生理周期、激素、干旱、光照等因素调控。

Cloning and sequence analysis of promoter in sugarcane ethylene receptor gene （Sc-ERS）

Objective]The present study was conducted to clone the promoter sequence of sugarcane ethylene receptor （Sc-ERS） and analyze its acting elements. Method]Sc-ERS promoter sequence was cloned from the genomic DNA of sug- arcane cuhivar ROC22 with chromosome walking technology based on thermal asymmetric interlaced PCR principle, and the acting elements of Sc-ERS were analyzed with PlantCARE and PLACE online tools. Result]The gene promoter sequence of Sc-ERS was cloned, and it was 1410 bp in size sharing 82% and 80% homology with the sequences of ERS25 and ERS14 of corn, respectively. PlantCARE online analysis results showed that the gene promoter sequence of Sc-ERS had promoter acting elements TATA-BOX and CAAT-BOX, light-responsive elements, drought-induced MYB binding sites, methyl jasmonate- responsive element, salicylic acid response element, endosperm expression cis-regulatory elements, heat stress responsive el- ements and so on. Conclusion]A 1410 bp promoter sequence of Sc-ERS was cloned from sugarcane genomic DNA, which con- tained several specific acting elements, indicating that its expression could be regulated by circadian rhythm, hormone, drought, light and other factors.