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Anatomical Indices of Cultivar and Age-related Scab Resistance and Susceptibility in Pecan Leaves1


Structural differences in leaves of pecan [Carya illinoensis (Wang) K. Koch] of cultivars resistant and susceptible to the scab pathogen, Cladosporium caryigenum (Ell. et Lang) Gottwald com. nov (formerly designated Fusicladium effusum Wint.), were examined using scanning and transmission electron microscopy. In immature leaf tissue, cultivar resistance was correlated with fewer peltate glandular trichomes, a greater frequency of collapsed trichomes, and abundant phenolic compounds in the palisade parenchyma and bundle sheath cells compared to susceptible cultivars. In mature, scab-resistant leaves of all cultivars, trichomes were collapsed and less numerous, phenolics were abundant, and cuticular and epidermal cell wall development was greater compared to that of immature leaves.