Abstract
In this work, a cDNA encoding a defensin from Picea glauca, named PgD1, was isolated. The corresponding PgD1 cDNA encodes a putative protein of 83 amino acids with a calculated molecular mass of 8.9 kDa. The mature protein of 50 amino acids is characterized by the presence of specific highly conserved residues common to all plant defensins. PgD1 is developmentally expressed during seed germination and is also up-regulated by wounding and by jasmonic acid treatment, suggesting a role in both the constitutive and induced defense mechanisms. The recombinant protein was found to cause extensive growth inhibition of three fungal pathogens ( Cylindrocladium floridanum, Fusarium oxysporum and Nectria galligena) at 2.5 μM.
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