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The molecular mechanisms underlying cold-resistance in Prunus campanulata Maxim. (P. campanulata) are not fully understood. This study aimed to establish a full-length library and analyze expressed sequence tags (ESTs) to provide tools to investigate the mechanisms of P. campanulata growth at low temperatures. Based on the switching mechanism at 5’end of RNA transcript technology, a full-1ength cDNA library was generated from young leaves of P. campanulata after 72 h treatment at 1◦C, and a preliminary EST analysis was carried out. Quantitative reverse transcription polymerase chain reaction was used to assess the expression of selected cold-related genes. The cDNA library titer was 1.2 × 106 cfu/mL−1, with a recombinant rate of 96%. The average size of inserted cDNA fragments was 1.3 Kb. EST data revealed the existence of 834 clones representing a total of 667 unigenes, including 574 singletons and 93 contigs. Blast analysis identified 475 unigenes with known and putative functions. Based on similarity search and GO annotation, 84 unigenes were associated with “response to stimuli”, suggesting that cold stress induced significant alterations in gene expression in P. campanulata cultivated at 1◦C for 72 h. Interestingly, DRP, MYB, HSP, GPX and GA20-ox gene expression was significantly up-regulated in plants cultivated at low temperature, while transcript levels of TIL, CDPK were decreased. P. campanulata cultivating at low temperature express genes associated with “response to stimuli”, and in particular DRP, MYB, HSP, GPX and GA20-ox gene are up-regulated while TIL, CDPK are downregulated in response to low temperature-stress

Construction of cDNA library from Prunus campanulata leaves and preliminary expressed sequence tag (EST) analysis during cold stress