Pyrus serotina

The toxins of many members of the fungal genus Al-ternaria produce phytotoxins of these, many [such as AM-toxin I (18)] are peptides. The fungal pathogen Alternaria mali on apples produce necrotic lesions on the leaves, shoots, and fruits of susceptible cultivars (Natori et al, 1981). Alternaria kikuchiana, which causes black spot disease on the Japanese pear (Pyrus serotina) produces phytotoxins which are based on A -acetylphenylalanine and a Cio fatty acid (Harbome, 1986). 

Fig. 5A-C Nonlinear emission spectra measured from A the cell wall of a parenchyma in maize Zea mays) stem B the stone cell of a pear Pyrus serotina R.) fruit C potato Solarium tuberosum L.) starch granule. These spectra were recorded under similar illumination intensity, with normalized 0.1 s integration time. Note the extraordinarily strong SHG from the starch granule...

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