| diplopyrone, a new phytotoxic tetrahydropyranpyran-2-one produced by diplodia mutila, a fungus pathogen of cork oak. | a new phytotoxic monosubstituted tetrahydropyranpyran-2-one, named diplopyrone (1), was isolated from the liquid culture filtrates of diplodia mutila, a plant pathogenic fungus causing a form of canker disease of cork oak (quercus suber). diplopyrone was characterized, using spectroscopic and chemical methods, as 6-[(1s)-1-hydroxyethyl]-2,4a,6,8a-tetrahydropyran[3,2-b]pyran-2-one. the absolute stereochemistry of the chiral secondary hydroxylated carbon (c-9), determined by application of mosher' ... | 2003 | 12608876 |
| assignment of the absolute configuration of (+)-diplopyrone, the main phytotoxin produced by diplodia mutila, the pathogen of the cork oak decline, by a nonempirical analysis of its chiroptical properties. | the nonempirical assignment of the absolute configuration of (+)-diplopyrone, the main phytotoxin of diplodia mutila, i.e., an endophytic fungus, widespread in sardinian oak forests, and considered one of the main causes of cork oak decline, has been approached by two different methods: (a) the exciton analysis of the circular dichroism (cd) spectrum and (b) the ab initio calculation of the optical rotatory power. both methods indicate that (+)-diplopyrone is 6-[(1s)-1-hydroxyethyl]-2,4a(s),6(r) ... | 2005 | 15624901 |
| remarkable microfungi from oaxaca (mexico) of acacia species. | in the state of oaxaca (mexico, 10 km north-west of puerto escondido 15 degrees 55' n, 97 degrees 09' w) we were able to collect some microfungi living as parasites or saprophytes on acacia species, some of them are causing attention for oaxaca. many belong to the deuteromycotina (hyphomycetes, coelomycetes) and ascomycotina. on a. hindsii: calonectria pseudopeziza (desm.) sacc., hypoxylon truncatum (schwein. fr.) j.h. miller, epicoccum nigrum link., zygosporium gibbum (sacc., m. roussau & e. bo ... | 2007 | 18396821 |
| botryosphaeria corticola, sp. nov. on quercus species, with notes and description of botryosphaeria stevensii and its anamorph, diplodia mutila. | botr yosphaeria stevensii frequently has been associated with dieback and canker diseases of oak, mainly in the western mediterranean area but more rarely in other regions. the species concept of b. stevensii has been unclear, and it is possible that some collections were identified incorrectly. a collection of fungal strains isolated from diseased oak trees and initially identified as b. stevensii was characterized on the basis of morphology and its nucleotide sequences. morphology was compared ... | 2004 | 21148880 |
| light converts endosymbiotic fungus to pathogen, influencing seedling survival and niche-space filling of a common tropical tree, iriartea deltoidea. | pathogens are hypothesized to play an important role in the maintenance of tropical forest plant species richness. notably, species richness may be promoted by incomplete filling of niche space due interactions of host populations with their pathogens. a potentially important group of pathogens are endophytic fungi, which asymptomatically colonize plants and are diverse and abundant in tropical ecosystems. endophytes may alter competitive abilities of host individuals and improve host fitness un ... | 2011 | 21305008 |