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The chitinase can inhibit fungal growth and reproduction by degrading fungal cell wall with chitin as the main component.So the chitinase gene has significant research value in plant disease resistance breeding.The whole cDNA sequence of chitinase gene designated as MdChi (GeneBank accession NO: HQ416905) was cloned from leaves of Fuji apple.Sequence analysis showed that the full cDNA was l158bp in size with an integrated open reading frame (ORF) of 954bp encoding 317 amino acids.