Phytotoxins produced by Pestalotiopsis guepinii, the causal agent of hazelnut twig blight

Phytopathologia Mediterranea

Ismail ERPER¹  Anna ANDOLFI¹  Alessio CIMMINO¹  Maria Chiara ZONNO¹  Maurizio VURRO¹  Carmen PERRONE¹  Antonio EVIDENTE² 

[1] ;Università degli Studi di Napoli Federico II, Italy;

关键词: Hazelnut;    Pestalotiopsis guepenii;    Phytotoxins;    Pestalopyrone;   

DOI  :  10.14601/Phytopathol_Mediterr-8566

来源: DOAJ

【 摘 要 】

The main lipophilic phytotoxic metabolite was isolated from the culture filtrates of Pestalotiopsis guepinii, the fungus causing twig blight of hazelnut. The metabolite was spectroscopically identified as pestalopyrone, a pentaketide that it was originally identified as a minor toxin produced by Pestalotiopsis oenotherae. The toxic activity of pestalopyrone was compared with that of nectriapyrone, a structurally related monoterpenoid recently isolated from Phomopsis foeniculi, and that of the new dihydro-derivative of nectriapyrone. The high phytotoxic activity of nectriapyrone and its dihydro-derivative on three non host  plants, showed that the double bond of the 1-methylpropenyl group at C-6 of the aromatic ring is inessential for its activity, while the much lower activity of pestalopyrone showed that the methyl group at C-3 of the same ring is an important structural feature. The high molecular weight hydrophilic phytotoxins produced by this fungus are reported for the first time.

【 授权许可】

Unknown