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A 5-kDa zinc-binding protein (ZBP) accumulates in the phloem above the graft union in citrus trees affected by two citrus decline disorders, citrus blight and Macrophylla decline. Citrus blight and Macrophylla decline are decline disorders of unknown etiology. Citrus blight has historically been restricted to humid production regions, and Macrophylla decline occurs in arid regions. A causal agent has not been identified for either disorder. Levels of the 5 kDa ZBP are increased 2.5- and 1.5-fold, respectively, in the phloems above the graft union in trees with citrus blight and Macrophylla decline. The protein was purified from citrus phloem and a partial N-terminal sequence was obtained. The protein has homology to the cystein-rich chitin binding domain of several plant chitinases and hevein. Hevein and class I chitinases, which have this N-terminal chitin binding domain, have antifungal activity and antibacterial activity and are induced by wounding and several other stresses. Oligonucleotides corresponding to the greatest conserved region in the N-terminal domain of the ZBP were produced. They were used as primers for PCR reactions against a citrus leaf cDNA library. Four PCR products were obtained from these reactions. The products are being subcloned and sequenced. They will be used to probe the citrus cDNA library to obtain the cDNA clone for the 5 kDa ZBP.

A Zinc-binding Protein in Citrus with Homology to Plant Chitinases