A cDNA Clone of BcHSP81-4 from the Sterility Line (Pol CMS) of Non-heading Chinese Cabbage (Brassica campestris ssp. chinensis)

BcHSP81-4 gene, a member of heat shock proteins, was identified from a suppression subtractive hybridization cDNA library in non-heading Chinese cabbage (Brassica campestris ssp. chinensis Makino). The deduced amino acid sequence of the BcHSP81-4 cDNA revealed that it has high homology to other plant organelle isoforms and similar homology to both cytoplasmic and prokaryotic HSP90s. To study the regulation of gene expression, BcHSP81-4 genes in maintainer and sterility lines were monitored at different development stages and at different stress treatments. Real-time PCR was used for quantification of BcHSP81-4 mRNA. These results indicate that BcHSP81-4 is not responsive to heat shock at least at 35°C, while it is very responsive to salt and cold stress. And high expression of BcHSP81-4 in the bud of sterile line suggests that it may play prominent roles in sterility of pol CMS in non-heading Chinese cabbage.