| dc.description.abstract | A study of the antagonistic of endophytic bacteria isolated from roots and leaves of
palm oil (Elaeis guineensis Jacq.) againts Ganoderma boninense Pat. has been done
from July 2007 to January 2008 at Microbiology Laboratory FMIPA USU Medan.
Endophytic bacteria were isolated from palm oil roots and leaves of 6 plantations in
Sumatera Utara. The results showed 40 different bacterial types consisting of 28
bacterial types from roots and 12 bacterial types from leaves, which were 11 isolates
from Tanah Jawa, Pematang Siantar, and few isolates were found from PTPN III
Rantau Prapat Utara, Labuhan Batu County and Islamic Centre Medan plantation,
with 4 isolates each. Gram staining showed that as many as 22.5% were Gram positive
and 77.5% were Gram negative. Almost all isolates had potential to inhibit the
mycelium of G. boninense, and 3 isolates showed its ability well in inhibit the
mycelium of G. boninense by result the inhibit zone. The isolates were PS34A, PS35A
and PS38D. The isolates inhibited the growth of G. boninense with the length of
inhibited mycelium is bigger than concentration of ketoconazole 0.09 mg/ml and 0.3
mg/ml, and smaller than 0.6 mg/ml, that was PS34A and PS35A inhibited as many as
7.8 mm, and PS38D inhibited as many as 9.8 mm. Whereas the concentration of
ketoconazole 0.09 mg/ml and 0.3 mg/ml inhibited as many as 6.8 mm and 0.6 mg/ml
inhibited as many as 12 mm. | en_US |
