[Cloning and expression analysis of HSP70 gene from Dendrobium officinale under low temperature stress].
OBJECTIVE
To investigate HSP70 gene expression from Dendrobium officinale under low temperature stress, which will provide the molecular biological foundation for breeding the low temperature resistant strain.


METHODS
HSP70 gene full length cDNA was cloned by rapid amplification of cDNA ends (RACE) on the basis of HSP70 gene fragment sequences, and the structure and function of HSP70 gene were deduced. The expression of HSP70 under low temperature stress was detected by RT-PCR.


RESULTS
The full length of HSP70 gene cDNA was 2 296 bp containing a 1 944 bp open reading frame (ORF) that encoded a protein of 647 amino acids. Its amino acids sequence had typical HSP70 characteristics and high homology with other plant's HSP70. Cold stress expression analysis showed that expression of the HSP70 gene could be induced by low temperature.


CONCLUSIONS
The HSP70 gene of D. officinale was successfully cloned and reported for the first time which proved that the expression could be induced by low temperature. The cloning of HSP70 gene provides a stable foundation for further study of D. officinale cultivation and the breeding of the cold resistance strains.
Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Provincial Strategic Alliance for Technical Innovation in Industry of Dendrobium officinale, Zhejiang Agricultural and Forestry University, Lin'an 311300, China. comeonldb@163.com
Dong-Bin
DB
Li
Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Provincial Strategic Alliance for Technical Innovation in Industry of Dendrobium officinale, Zhejiang Agricultural and Forestry University, Lin'an 311300, China.
Han-Hui
HH
Gao
Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Provincial Strategic Alliance for Technical Innovation in Industry of Dendrobium officinale, Zhejiang Agricultural and Forestry University, Lin'an 311300, China.
Jin-Ping
JP
Si
Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Provincial Strategic Alliance for Technical Innovation in Industry of Dendrobium officinale, Zhejiang Agricultural and Forestry University, Lin'an 311300, China.
Yu-Qiu
YQ
Zhu
D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D003080:Cold Temperature; D031667:Dendrobium / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment
D018840:HSP70 Heat-Shock Proteins; D010940:Plant Proteins