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ABSTRACT
Strains of Phoma caricae-papayae were shown to be light-dependent and light-independent for sporulation. Effective wavelengths for inducing fruiting body, pycnidium and perithecium, formation in a light-dependent strain were shorter than 360 nm. Hybridization between the two strains resulted in progeny which segregated 1:1 with respect to dependency on light for fruiting body formation, indicating a single nuclear gene control for light-dependent sporulation. Stable and uniform heterokaryons were readily established between the two strains without any selective pressure, in spite of the different growth rates of the parental homokaryon strains.