盐穗木钾转运蛋白基因HcKUP12的克隆及在盐胁迫下的表达分析

利用RACE技术从盐生植物盐穗木(Halostachys caspica)中克隆获得了一个钾离子转运体基因,经BLAST同源比对发现该基因与拟南芥钾离子转运蛋白At KUP12基因最为相似,命名为Hc KUP12。Hc KUP12基因c DNA全长为2953 bp,含有2544 bp的阅读框、262 bp的5'-UTR和147 bp的3'-UTR,编码847个氨基酸,分子质量为93.31 k D,理论等电点为7.19。利用实时荧光定量RT-PCR分析了Hc KUP12基因在600 mmol/L Na Cl处理下胁迫24 h的表达模式,结果显示该基因在盐胁迫下表达量显著增加,至处理24 h时达到最高(为对照的225倍),初步推测其可能是与盐穗木耐盐相关的一个候选基因。

Cloning of Potassium Transporter Gene (HcKUP12) from Halostachys caspica and Its Expression Profile under Salt Stress

A gene encoded potassium transporter was cloned from Halostachys caspica by SMART^TM RACE, and homology analysis by BLAST showed that it had high identity with AtKUP12 from Arabidopsis thaliana, so named HcKUP12. Results showed that HcKUP12 contained a 262 bp 5'-UTR, 147 bp 3'-UTR and 2544 bp open reading frame encoding 847 amino acids with a molecular weight of 93.31 kD and an isoelectric point of 7.19. The expression profile of HcKUP12 was examined under 600 mmol/L NaCl stress during 24 h using real-time qRT-PCR. Results indicated that its expression level was significantly increased and showed the highest level of expression (225 times higher than that of the control) after 24 h treatment. This suggests that the HcKUP12 gene might be a candidate gene related to salt tolerance in Halostachys caspica.