Abstract
Net photosynthesis (Pn) and dark respiration (Rd) were determined on detached leaves of pear (Pyrus serotina, cvs. Suishu, Chojuro, Doitsu, Nijisseiki, Pyrus communis cv. Bartlett and Pyrus betulaefolia) infected by Japanese pear rust (Gymnosporangium asiaticum MIYABE et YAMADA).In the resistant cultivar (Bartlett), very few symptoms in leaves occurred. Pn and Rd were unaffected by infection. However, in susceptible cultivars (Suishu, Chojuro, Doitu) and P. betulaefolia, depression in Pn and stimulation of Rd accompanying an increase in size of lesions on leaves occurred.In Japanese pear cv. Nijisseiki, no significant differences were found either in Pn and Rd rate or in degree of infection by shading treatment.
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