Uromycladium tepperianum, the gall rust fungus from Falcataria moluccana in Malaysia and Indonesia |
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Authors: | Sri Rahayu Su See Lee Nor Aini Ab Shukor |
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Institution: | (1) Department of Silviculture, Faculty of Forestry, Gadjah Mada University, Bulaksumur, Yogyakarta, 55281, Indonesia;(2) Forest Research Institute Malaysia, Kepong, 52109 Selangor, Malaysia;(3) Institute of Tropical Forestry and Forest Products, University Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia |
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Abstract: | Batai (Falcataria moluccana) is a valuable tree species for forest plantations in Malaysia and Indonesia. Since 1993, a gall rust disease has caused
severe damage to all growth stages, from seedlings in the nursery to mature trees in the field. To identify the fungus causing
gall rust disease on F. moluccana in Malaysia and Indonesia, study of the mode of infection and changes in the anatomy of infected cells were carried out in
the anatomy laboratory. The disease in Malaysia and Indonesia is caused by Uromycladium tepperianum. The fungus produces three longitudinally ridged teliospores on each head, with spores measuring 13–20 μm wide and 17–28 μm
long. The fungus is microcyclic, completing its entire life cycle on F. moluccana. This study confirmed that the teliospores themselves cannot infect the host. Under favorable conditions, about 10 h after
inoculation, teliospores germinate to produce basidiospores that form penetration pegs about 6 h later, and it is this peg
which penetrates the host cells directly through the epidermis. Pycnia, recognized as small brown pustules, break through
the epidermis about 7 days after inoculation. |
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Keywords: | Batai Fabaceae Gall rust disease Mode of infection Pathogenicity test |
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