The influence of the conditions of leaf extract on perithecia formation of Pleospora herbarum  

Ref ID: 18456

Author:

Toshiko Furukawa, Mafumi Abiko, Takashi Okamoto

Author address:

Dep. Biological Sciences, Tokyo Metropolitan University

Full conference title:

11 th European Conference on Fungal Genetics

Abstract:

Many phytopathogenic fungi have both teleomorph and anamorph, and differentiate from hyphae depending on
the conditions in the host plants. The fungi often lose the morphogenic ability and grow only in the hyphae form
by the succession of in vitro culture. They, however, recover the ability if the hyphae could infect to the host
plants. We have developed the method (ALP medium) that many fungi could form perithecia in vitro using lightly
boiled gardenia and hydrangea leaves (Furukawa and Kishi 2000). These facts indicate that some common factors
which induce perithecia formation in many fungi must exist in the leaves. We tried to extract the factors and re8208;
investigate physical conditions, especially light wavelength, to induce perithecia. Pleospora herbarum (Pers.)
Rabenh was used for the examinations. As a result, the activity existed in the oxidized aqueous fraction, which
induced the perithecia and conidia abundantly under the dark condition. Fatty acids and the related compounds,
which were reported to induce perithecia and conidia in Aspergillus nidulans (Calvo et al. 1999, Tsitsigiannis et al
2004, 2007), did not induce perithecia or conidia under light or dark conditions. Blue light, which is essential for
conidia formation in Neurospora crassa (Olmendo et al. 2010), was not needed for P. herbarum on the medium
containing oxidized leaf extract, though it was essential for perithecia production on other media. Those imply the
morphogenic switch of phytopathogenic fungi is different from that of saprozonic fungi.    

Abstract Number: PR1.37

Conference Year: 2012

Link to conference website: http://www.ecfg.info/images/Abstract_Book_Electronic.pdf

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