Pathogenic Variability of Bipolaris oryzae Causing Leaf Spot Disease of Rice in West Africa

Q4 Agricultural and Biological Sciences

International Journal of Phytopathology Pub Date : 2018-12-27 DOI:10.33687/PHYTOPATH.007.03.2643

A. Boka, A. Bouet, A. Tiendrebéogo, Abalo Itolou Kassankogno, I. Ouédraogo, Ghislain Noumouha Epa N’Da, Odette D. Denezon, A. Adiko

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引用次数: 4

Abstract

An assessment of rice crop resistance to Bipolaris oryzae, a causal agent of rice brown leaf spot or helminthosporium disease was carried out. Ten (10) irrigated and upland rice varieties were used in this study. Seven (7) isolates of B. oryzae from Burkina Faso, seven (7) from Côte d’Ivoire and six (6) from Togo were used. The ten (10) varieties were inoculated with B. oryzae strains to assess their effect and determine the resistance level of these varieties to rice leaf spot (Helminthosporium). The varieties Bouaké- AM, FKR60N, NIL130, V10, FKR62N and CY2 showed a good level of resistance against all the isolates. The incidence of the disease on leaves reached 62.22% of severity index. Results revealed also that the strain effects are not linked to their country of origin. The investigation on the pathogenicity of Bipolaris oryzae isolates displayed the existence of a pathogenic variability among the fungus populations. These findings suggest that the tested varieties possess resistance genes that can be used in varietal selection.

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西非水稻叶斑病病原菌的变异

对水稻褐叶斑病和线虫病病原菌稻瘟病进行了抗性评价。本研究选用了10个灌溉和旱地水稻品种。7株来自布基纳法索，7株来自Côte d ' ivire, 6株来自多哥。将10个品种分别接种米芽孢杆菌菌株，评价其对水稻叶斑病(Helminthosporium)的抗性。品种bouak - AM、FKR60N、NIL130、V10、FKR62N和CY2对所有菌株均表现出较好的抗性。叶片发病率达到严重指数的62.22%。结果还显示，菌株效应与它们的原产国无关。对稻瘟病菌分离株的致病性研究表明，稻瘟病菌群体间存在致病性变异。这些结果表明，被试品种具有抗病基因，可用于品种选择。

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来源期刊

International Journal of Phytopathology Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)

CiteScore

1.20

自引率

0.00%

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