Phytoactive Eremophilanes Produced by the Weed Pathogen Drechslera gigantea.
Phytoactive substances were present in a culture broth of Drechslera gigantea, a pathogenic fungus of several grasses. Twelve eremophilane sesquiterpenes (1, 2, 3, 4, 6, 7, 10, 11, 12, 13, 14, and 15) were isolated and structurally characterized by a combination of single-crystal X-ray diffraction and spectroscopic analyses. Most of these sesquiterpenoids were phytotoxic; however, compounds 1 and 3 caused chlorophyll retention, an activity previously associated with phytohormones.
a The Institute of Physical and Chemical Research (RIKEN) , Wako , Saitama 351-01 , Japan.
F
F
Sugawara
b Department of Chemistry-Baker Laboratory , Cornell University , Ithaca , N. Y. 14853-1301 , U.S.A.
Y F
YF
Hallock
c Department of Plant Pathology , Montana State University , MT 59717 , U.S.A.
G D
GD
Bunkers
c Department of Plant Pathology , Montana State University , MT 59717 , U.S.A.
D S
DS
Kenfield
c Department of Plant Pathology , Montana State University , MT 59717 , U.S.A.
G
G
Strobel
a The Institute of Physical and Chemical Research (RIKEN) , Wako , Saitama 351-01 , Japan.
S
S
Yoshida