利用 RT-PCR 手段克隆得到1个毛白杨 CBF 基因 cDNA,命名为 PtCBF5(GenBank注册: DQ354395 )。PtCBF5 全长 837 bp,该序列包括起始密码子 ATG 和 42 bp 的 5′ 末端非编码区,终止密码子 TGA 和 98 bp 的 3′末端非编码区,开放阅读框编码 231 个氨基酸。 RT-PCR 半定量研究表明: PtCBF5 在叶片组织中的表达量高,茎、根中的表达量低。组培苗在低温、干旱、NaCl、ABA 条件下处理诱导 24 h,在低温和干旱的条件下 PtCBF5 表达量在诱导 30 min 后开始增加, 分别在 2 h 和 6 h 达到峰值,24 h 后又恢复到初始水平; 而高盐和 ABA 存在的条件下未有显著变化。 PtCBF5 在植物体适应寒冷和干旱的过程中可能有着重要作用,尤其在逆境初期。
Cold repeat binding factor (CBF) proteins, specifically binding to the cold repeat (CRT)/dehydration-responsive element (DRE), have been identified as a group of important transcription activators of plants which regulate the expression of genes in response to the cold, drought and high-salt stresses. PtCBF5 from Populus tomentosa was cloned by RT-PCR methods, GenBank accession No. DQ354395. It contained an ORF of 696 bp encoding 231 amino acids domain that showed the typical characteristics of CBF gene family. The transcripts of PtCBF5 were the most abundant mRNA products in leaves, however relatively scarce in stem and roots using semi-quantitative RT-PCR. The shoots were treated with low-temperature, dehydration, NaCl, and ABA (abscisic acid). PtCBF5 gene could be greatly induced by low-temperature and dehydration stresses. Expression of PtCBF5 gene was increased in 30 min after freezing or drought treatments, and reached to a peak after 2 h in freezing or 6 h in dehydration. PtCBF5 may play very important roles in early signal transduction related to the cold and dehydration stresses.
全 文 :第 !" 卷 第 ! 期
# $ % $ 年 ! 月
林 业 科 学
&’()*+(, &(-.,) &(*(’,)
./01 !",*/1 !
,234,# $ % $
毛白杨转录因子 !"#$%& 的表达模式分析
周5 洲5 李永丽
(河南科技大学林学院 5 洛阳 !6%$$7)
摘 5 要:5 利用 8+9:’8 手段克隆得到 % 个毛白杨 #$% 基因 ;<*,,命名为 !"#$%&(=>?@A?B 注册:
端非编码区,开放阅读框编码 #7% 个氨基酸。8+9:’8 半定量研究表明:!"#$%& 在叶片组织中的表达量高,茎、根
中的表达量低。组培苗在低温、干旱、*A’0、,@, 条件下处理诱导 #! I,在低温和干旱的条件下 !"#$%& 表达量在
诱导 7$ JK? 后开始增加,分别在 # I 和 " I 达到峰值,#! I 后又恢复到初始水平;而高盐和 ,@, 存在的条件下未
有显著变化。!"#$%& 在植物体适应寒冷和干旱的过程中可能有着重要作用,尤其在逆境初期。
关键词:5 毛白杨;基因表达;寒冷 L干旱响应;转录分析
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