| pre-exposure to ozone predisposes oak leaves to attacks by diplodia corticola and biscogniauxia mediterranea. | one-year-old cork oak (quercus suber) and turkey oak (q. cerris) seedlings were exposed to ozone (110 ppb, 5 h day(-1), for 30 days) and were inoculated with diplodia corticola and biscogniauxia mediterranea, respectively, by spraying a suspension of spores on the leaves. both fungi are endophytic and may act as weak parasites, contributing to oak decline. ozone exposure stimulated leaf attacks after inoculation, although the physiological, visible, and structural responses of both oaks to o3 ex ... | 2007 | 17450300 |
| diplobifuranylones a and b, 5'-monosubstituted tetrahydro-2h-bifuranyl-5-ones produced by diplodia corticola, a fungus pathogen of cork oak. | two new 5'-monosubstituted tetrahydro-2h-bifuranyl-5-ones, named diplobifuranylones a and b (1 and 2), were isolated from the culture filtrates of diplodia corticola, the causal agent of a canker of cork oak (quercus suber). the same fungus also produced eight known metabolites, namely, the diplopyrone, (3s,4r)-trans- and (3r,4r)-cis-4-hydroxymellein, sapinofuranone b and its (s,s)-enantiomer, and sphaeropsidins a-c. diplobifuranylones a and b (1 and 2) were characterized, using spectroscopic an ... | 2006 | 16643050 |