Abstract
AbstractEarly development of Erysiphe pisi (powdery mildew) was studied on normal peas (with chlorophyll), natural albino mutants (without chlorophyll) and on chimeric leaves of pea induced by ethyl methane sulphonate (EMS) under different light exposures. Different light regimes [continuous light; continuous darkness; short day (8 h light/16 h darkness); long day (16 h light/8 h darkness)] did not influence the early development of E. pisi on pea leaves. However, under continuous darkness a lower number of haustoria was observed in comparison with other treatments. Erysiphe pisi failed to develop on naturally developed complete albino leaves as well as on the albino parts of chimeric leaves induced by EMS treatment. A lesser number of appressoria and haustoria was observed on albino leaves. Results suggest that the presence of some nondiffusable chemical(s) in normal leaves of pea is essential for the establishment of successful biotrophy.
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