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Table 1 Summary of PR gene families and their functions

From: Theobroma cacao L. pathogenesis-related gene tandem array members show diverse expression dynamics in response to pathogen colonization

PR gene class Common name Function References
PR-1 None (CAP/SCP superfamily) Unknown. [10, 11, 56]
PR-2 β-1,3-glucanase Aid in cell wall degradation. [10, 11, 79]
PR-3 Chitinase–type I, II, IV, V, VI, VII Aid in cell wall degradation. [10, 11, 80, 81]
PR-4 Chitinase-Hevein-like Aid in cell wall degradation. May have RNase and DNase activity. [10, 11, 19, 8083]
PR-5 Thaumatin-like Degrade pathogen membranes. [10, 11, 42, 84, 85]
PR-6 Proteinase-inhibitor Inhibit proteolysis by herbivorous insects. [10, 11, 42, 86]
PR-7 Endoproteinase Aid in cell wall degradation. [10, 11, 87]
PR-8 Chitinase-type III Aid in cell wall degradation. May have lysozymal activity. [10, 11, 80, 81, 88]
PR-9 Peroxidase Regulate reactive oxygen species concentration, contribute to cell wall lignification. [10, 11, 89]
PR-10 Ribonuclease-like Degrade RNA, may degrade viruses. [10, 11, 90, 91]
PR-11 Chitinase-type I Aid in cell wall degradation. [10, 11, 80, 81]
PR-12 Defensin Degrade fungal membranes. [10, 11, 92]
PR-13 Thionin Directly permeabilize lipid bilayers. [10, 11, 61]
PR-14 Lipid-transfer Protein Degrade pathogen membranes, mechanism unclear. [10, 11, 93]
PR-15 Germin/Oxalate Oxidase Regulate reactive oxygen species production. [11, 62, 94]
PR-16 Germin-like/Oxalate Oxidase-like Regulate reactive oxygen species production, catalyze monosaccharides. [11, 62, 94]
PR-17 Putative Zinc-metalloproteinase Proteinase function probable, mechanism unclear. [11, 95]