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cDNA cloning and characterization of a putative 1,3-beta-D-glucanase transcript induced by fungal elicitor in bean cell suspension cultures.

Synthetic oligonucleotides based on similarity between tobacco 1,3-beta-D-glucanase and barley 1,3-1,4-beta-D-glucanase were used to prime the synthesis and amplification of a 162 bp bean (Phaseolus vulgaris L.) beta-glucanase cDNA by the polymerase chain reaction (PCR). The PCR product was used to isolate a near full-length beta-glucanase cDNA corresponding to an approximately 1400 bp full-length transcript, from a library containing cDNA sequences complementary to mRNA from fungal elicitor-treated bean cells. At the amino acid level, the bean beta-glucanase cDNA was 59% similar to tobacco 1,3-beta-D-glucanase, 46% similar to barley 1,3-beta-D-glucanase and 46% similar to barley 1,3-1,4-beta-D-glucanase. At the nucleotide level, the similarities were 65, 50 and 53% respectively. The beta-glucanase appeared to be encoded by a single gene with similar genomic organization in bean cultivars Canadian Wonder, Imuna and Saxa. On the basis of predicted Mr, isoelectric point, sequence similarity, and comparisons of rate of transcript appearance with induced enzyme activity, it was concluded that the cDNA encodes the basic bean endo-1,3-beta-D-glucanase. Glucanase transcripts were induced, from very low basal levels, with similar kinetics to chitinase transcripts in elicitor-treated bean cell suspension cultures.