| Summary: | Sengon (Falcataria moluccana (Miq.) Barneby & J.W. Grimes) is a fast growing
species with short - harvest period, simple culture technique, high productivity, and is
able to grow in all soil condition.Regeneration through coppice has several advantages,
among others, the relatively more rapid growth, the volume of wood produced more and
can reduce the cost of planting. But problem appears when it tends to be fragile by attack
of gall rust of Uromycladium tepperianum. This disease inhibits growth, produces defect
on stem reducing volume and wood quality, even leads to the death as the worst effect.
This research aims to investigate the anatomy of gall rust in sengon and its wood
anatomical changes representing by the arrangement, size and amount of cell. Completely
randomized designed was used as research method with two main factors were the
condition of gall rust and wood. Gall rust condition included three differences on size
diameter which were big ( > 1.1 cm), medium ( 0.8 � 1 cm) and small (< 0.8 cm) while
wood condition parameters were attacked wood and infected wood.
Result was shown through anatomy of gall rust and wood cells. In gall rust
anatomy, dark substrate contents and vessel elements showed an increase as the size of
gall rust increased which were from 4,59% to 7,44% and 13,67% and 14,15%
respectively. The decrease of kalus from small to big of gall rust was found from 81,74%
to 78,40%. Furthermore there was little fiber on the gall rust because of lack of giberelin,
there sklereid skin tumors as well as the wavy pattern on the composition of the callus.
The decrease at percentage and size of vessel diameter on infected wood was 2,83% and
0,14 mm respectively while in healthy wood was found 7,05% and 0,24 mm as the effects
of etilen hormone. The increase of parenchyma number represented through longitudinal
parenchyma and ray cells was 21,86% and 22.23% respectively in infected wood while it
was 7,96% and 9,54% in healthy wood as result of auxin and sitokinin, and a
modification deployment parenchyma into shape ribbon in infected wood behind a small
gall rust.
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