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Conidial germination and germ tube growth of erysiphe pisi in relation to visible light and its transmission through pea pisum sativum cultivar feltham first leaves


, : Conidial germination and germ tube growth of erysiphe pisi in relation to visible light and its transmission through pea pisum sativum cultivar feltham first leaves. Transactions of the British Mycological Society 81(2): 269-274

Germination of conida of E. pisi, and germ-tube growth, are sensitive to low levels of irradiance at wavelengths within the visible spectrum, especially if conidia come from plants previously held in darkness for 24 h. At similar irradiances, germination is higher on the lower than on the upper epidermis of pea leaves illuminated from above. Germination, but not germ-tube growth, in vitro is timulated by light transmitted through pea leaves. Development of conidia in vitro, in light transmitted through selected interference filters, is stimulated by bands of peak wavelengths 430 and 496 nm, inhibited by light of peak 551 nm, and insensitive to light of longer wavelengths. The significance of the responses is discussed in relation to the light transmitting properties of pea leaves which alter after mildew infection.

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