Characterisation of Synchytrium Psophocarpi (Rac.) Baumann and its Pathogenicity on Winged Bean in Peninsular Malaysia
Winged bean (Psophocarpus tetranologobus) is an important vegetable crop grown in various tropical climates around South East Asia and Oceania. Its edible parts include leaves and bean pods. An important disease damaging to winged bean is false rust or orange gall caused by Synchytrium psophocar...
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| 格式: | Thesis |
| 語言: | English English |
| 出版: |
2010
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| 主題: | |
| 在線閱讀: | http://psasir.upm.edu.my/id/eprint/10716/1/FP_2010_2_A.pdf |
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| 總結: | Winged bean (Psophocarpus tetranologobus) is an important vegetable crop
grown in various tropical climates around South East Asia and Oceania. Its
edible parts include leaves and bean pods. An important disease damaging
to winged bean is false rust or orange gall caused by Synchytrium
psophocarpi (Rac.) Baumann. It causes the appearance of bright-orange
pustules along the veins of young leaves, stems, pods, and sepals of winged
bean flowers. It also reduces pod production and seed yield which is more
prevalent during rainy season and high moisture. Thus far, there has been no
literature documenting the incidences of orange gall and the causal organism
on winged bean in Malaysia. The main objective of this study were to record
the local distribution of the disease and to characterized of the causal
organism. Evaluation of pathogenicity on winged bean and various other leguminous plants was also conducted. Fungi occurring on diseased winged
bean leaves, pods and stems collected from the states of Selangor and Johor
showed typical symptoms. Samples were examined using light and scanning
electron microscope for the characterization of sporangia and zoospores.
The sporangia have thin walls that are clear and colorless. At higher
magnification (1000x), these sporangia appear to contain yellow or orange
granules that can be very dense. The average diameter of each sporangium
is about 28.64μm by 40.77μm, implying the variation in the sizes. They were
generally spherical than ovoid in shape. This diameter is in accordance with
previous reports where the average was about 41.20μm. |
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