African Crop Science Journal (2007) 15, 191-199

S.L. Ouedraogo, I. Somda, I. Wonni and Y. Seré (2007)
Etude de la résistance au flétrissement bactérien de lignées inter-et intraspécifiques de riz de bas-fonds en conditions d'infestation artificielles
African Crop Science Journal 15 (4), 191-199
Abstract: Rice (Oryza sativa) is an important staple food in Burkina Faso. However, rice productivity in Burkina Faso is affected by bacterial wilt disease leading to total crop failure in many instances. Therefore, there is need to evaluate and subsequently introduce cultivars that exhibit resistance under ecological zones in Burkina Faso. In this study, evaluation of the resistance to bacterial wilt was done using sixty nine lines of low-land rice, eight of which were intraspecific and sixty one interspecific. A strain of Xanthomonas oryzae pv. oryzae isolated from Burkina Faso was used to challenge the candidate strains. A reference strain (NCPPB 1150) obtained from Denmark and distilled water were used as positive and negative control, respectively. The susceptible variety to bacterial wilt, chinese variety TCS 10 and the resistant one, FKR19 were also used as control. The experiment was conducted in screenhouse at the temperature of 28-30 °C and 12 hours daylight cycle. Experimental design was a split splot with three replications. Fifteen days old plants of rice were inoculated and disease symptoms were observed fourteen days after inoculation. The results indicated that 55,07 % of the lines are resistant, 23,20 % moderately resistant, 5,80 % moderately susceptible, 7,24 % susceptible and 8,69 % highly susceptible. It was also observed that 78,68 % of interspecific lines were more resistant compared to 75 % of the intraspecific. Bacterial strain isolated from Bagre (Burkina Faso) was more virulent than the reference NCPPB 1150. The inter and intraspecific lines need to be tested in the field conditions before recommendation for adoption in zones infested by Xanthomonas oryzae pv. oryzae.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: French)

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthomonas oryzae	Rice (Oryza)	Burkina Faso