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A pathogenesis-related protein induced by infection with Ascochyta rabiei was purified from intercellular washing fluid of chickpea (Cicer arietinum L.) leaves. Amino-terminal se­quencing identified the protein, named PR-5a, as a thaumatin-like protein. The isoelectric point was determined with 6.5 and the molecular mass is 16 kDa. Therefore, chickpea PR-5a is the first dicot member of a TLP subgroup containing small TLPs with a molecular weight between 15 and 18 kDa. PR-5a shows no antifungal activity towards A. rabiei. Screen­ ing of a chickpea cDNA library led to the isolation of a cDNA clone (p5a-241) for this protein. A second cDNA clone (ELR112) encoding a TLP was isolated using differential hybridisation of cDNA libraries obtained from elicited and water treated cell suspension cultures of chickpea. The deduced protein (PR-5b) has a molecular mass of 22 kDa. PR-5b is postulated to be located in the vacuole due to the presence of a respective N-terminal signal peptide and a carboxy-terminal extension. Southern blot analyses showed that ELR112 and p5a-241 represent single copy genes. During fungal infection of chickpea plants expres­ sion of both genes proceeds much faster in an A. rabiei resistant cultivar than in a suscep­tible one.

zeitschrift für naturforschung c

Biochemical and Molecular Biological Studies on Infection (Ascochyta rabiei)- Induced Thaumatin-Like Proteins from Chickpea Plants (Cicer arietinum L.)