Ammopiptanthus mongolicus is the only evergreen broadleaf shrub endemic to the Alashan desert, northwest sand area of China, and can survive −30°C or an even lower temperature in winter. A modified solid-phase subtraction hybridization technique was developed to isolate and screen cDNAs whose transcripts increased in cold-treated A. mongolicus seedlings. Sequence analysis of the screened clones indicated that 11 clones had coding regions, with four of them containing a complete open reading frame. Nine of the 11 clones shared various degrees of homology with the genes found in the GenBank database and the other two were unidentified sequences. Sequence data further revealed that these accumulated transcripts encoded: three low molecular weight proteins (a late-embryogenesis protein and two cold acclimation responsive proteins); two photosynthesis-related proteins, (photosystem I subunit II precursor (PsaD) and photosystem II oxygen-evolving complex 33kDa subunit OEC33); a protease inhibitor; an adenosine triphosphatase and a 14-3-3 related protein. Analysis of the function of these proteins indicated that the low molecular weight proteins were associated with water holding ability of cytoplasm, photosynthesis-related proteins participated in the adjustments of photosynthetic apparatus to resist photoinhibition; 14-3-3 related protein could interact with adenosine triphosphatase to enhance ATPase activity and energy metabolism, and protease inhibitor is involved in the prevention of unwanted cell death caused by reactive oxygen species. We suggest that cold acclimation with low light intensity in A. mongolicus is a more complex interaction of low temperature, light, energy and signal than that assumed previously.
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Document Type: Regular Paper
Publication date: June 1, 2005
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.