T. Kokubun, J. Harborne, J. Eagles
Jul 1, 1995
Citations
0
Influential Citations
43
Citations
Journal
Phytochemistry
Abstract
Abstract Fungus-challenged sapwood of Photinia davidiana and Pyracantha coccinea produced two new dibenzofuran phytoalexins, 7-methoxyeriobofuran and 9-hydroxyeriobofuran, respectively. The known eriobofuran was also confirmed in both species. On the other hand two Crataegus species produced antifungal dibenzofurans constitutively in the bark; the major constituent is now identified as 2,8-dihydroxy-3,4,7-trimethoxydibenzofuran. The antifungal activities (ED 50 ) of the newly reported dibenzofurans against three plant pathogens were in the range of 55 to 328 μg ml −1 , comparable with those of the cotonefurans. The taxonomic aspects are discussed briefly.