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Research Journal of Botany

Year: 2020 | Volume: 15 | Issue: 1 | Page No.: 6-15
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Authors

Shireen A. Jahan Quazi

Shireen A. Jahan Quazi

Sariah Meon

Hawa Jaafar

Zainal Abidin B.M. Ahmad

Keywords

Background and Objectives: Bakanae is one of the major fungal diseases of rice. It is difficult to develop bakanae resistant varieties due to high genetic variation of the pathogen. Hence, bakanae is alarming in the affected rice growing areas of the world. It is essential to find out the infection process of the causal pathogen in rice plant to manage this notorious disease. Therefore, screening was done first to categorize the susceptible and resistant variety and then infection process of the causal pathogen was studied. Materials and Methods: Selected nine varieties were screened against bakanae disease susceptibility. Using the disease severity scale of 0-5, three disease scores of 1, 3 and 5 were found to produce typical bakanae symptoms in the susceptible variety MR 211 after 7, 14 and 21 days of inoculation, respectively. Inoculated varieties were categorized as resistant, moderately resistant and susceptible irrespective of DSI and combined effect of GA3, FA, MON and chitinase activity. Among nine varieties, seven were identified as susceptible, one variety (G-27) as moderately resistant and one variety (BR3) as resistant. Results: It was observed that initiation of infection by F. proliferatum started after 24 h of inoculation and infection became established in the susceptible variety MR 211 after 5 days, while colonization was observed after 7 days. Thus, approximately 5-7 days for infection establishment and colonization were found suitable for symptoms expression. This infection was established through the seed coat of the susceptible variety MR 211. Conclusion: Knowing the duration of infection process and disease development of F. proliferatum in susceptible rice varieties, it will be helpful to take appropriate bakanae management option through disruption of its infection cycle.
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How to cite this article

Shireen A. Jahan Quazi, Sariah Meon, Hawa Jaafar and Zainal Abidin B.M. Ahmad, 2020. Varietal Screening and Infection Process of Fusarium proliferatum in Rice Varieties. Research Journal of Botany, 15: 6-15.

URL: https://scialert.net/abstract/?doi=rjb.2020.6.15

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