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Within the last decade, a great deal of attention has been devoted to the role of chitinases and/3-1,3-glucanases in plant/microbe interactions. While there is strong evidence that these hydrolases are antifungal proteins, there are also recent indications of roles in both plant morphogenesis and plant/microbe signal perception. This paper reviews recent findings pertinent to root/microbe interactions, and discusses the nature and significance of specific hydrolase isoforms in symbioses with arbuscular mycorrhizal (AM) fungi.

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