Histological study of the interaction of Exserohilum longirostratum and Enchinochloa crusgalli (Barnyardgrass) /
Exserohilum longirostratum has been investigated as a mycoherbicide agent against several weedy grasses with particular attention to the influence of environmental factor on disease development. However, the histological study of pathogen host interaction of the susceptible and the resistant host ha...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
2005.
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| Summary: | Exserohilum longirostratum has been investigated as a mycoherbicide agent against several weedy grasses with particular attention to the influence of environmental factor on disease development. However, the histological study of pathogen host interaction of the susceptible and the resistant host has not been reported. This study elucidates the understanding of the basic of the host-pathogen relationship between E. longirostratum, barnyard grass (susceptible) and rice (resistant). This study will provide information on the safety of E. longirostratum when used as bioherbicide in rice field. The conidia germination, germ tube length, branching and appreassoria formation were significantly increase on barnyardgrass, and cytological investifation showed that E. longirostartum had penetrated and colonized leaves of barnyard grass. The interaction between E. longirostratum and barnyard grass resulting in the development of the necrotic lesion were examined using light and electron microscopy. Following appressorium formation a reorganization of the network of secondary hyphae and cytoplasmic strands in underlying epidermal cells resulted in the accumulation of cytoplasm and the migration of the nucleus towards the appressorium. Successful penetration was followed by extensive colonization of the invaded epidermal cell wall. However, these observation were absent in resistant interaction. In resistant host, the conidia grew and produced germ tube, but the growth were inhibited by amorphous material that was present both on the conidia and germ tube causing the conidia and germ tube to plasmolyse. This study, thus, proved that E. longirostratum is host specific and in not pathogenic to rice. |
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| Physical Description: | 52 leaves : ill. ; 30cm. |