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Resistance of four inbred maize lines to inoculation with 20 isolates of maize streak virus from Zimbabwe

Author: Mawere, S.
Author: Vincent, V.
Author: De Meyer, J.
Author: Pixley, K.V.
Year: 2006
ISSN: 0191-2917
URI: http://hdl.handle.net/10883/3036
Abstract: Maize streak is the most widespread and important disease of maize in sub-Saharan Africa. Maize streak virus (MSV)-resistant maize germ plasm is available in several countries, but little is known about the stability of its resistance to MSV strains that may differ from one region to another. We used four maize inbred lines (CML312, CML206, CML216, and MSR) known to differ widely for their resistance to MSV in Harare, and evaluated their resistance to 20 MSV isolates collected from the wild during 2 years at locations across Zimbabwe. Maize streak development and symptom severity were evaluated in replicated greenhouse experiments using artificial inoculation via viruliferous leafhoppers. All 20 MSV isolates induced maize streak symptoms on moderately and highly susceptible genotypes by about 1 week after inoculation (WAI). Differences among isolates for severity of early maize streak symptoms were ephemeral, and resistance was accurately differentiated by all isolates by 3 to 4 WAI. Differences in final maize streak symptom scores induced by the isolates were statistically significant, but differed only by a maximum of 7% in 1999 and 19% in 2000. Although genotype, isolate, and genotype by isolate effects for maize streak symptom scores were significant (P < 0.01), relative MSV resistance of the genotypes was consistently ranked by all 20 MSV isolates.
Format: PDF
Language: English
Publisher: American Phytopathological Society (APS)
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Country focus: Zimbabwe
Region: Southern Africa
Pages: 1485-1489
Issue: 12
Volume: 90
DOI: 10.1094/PD-90-1485
Keywords: Corn
Country of Focus: ZIMBABWE
Country of Focus: AFRICA
Agrovoc: MAIZE STREAK GEMINIVIRUS
Agrovoc: DISEASE RESISTANCE
Agrovoc: GERMPLASM
Agrovoc: INBRED LINES
Agrovoc: EXPERIMENTATION
Journal: Plant Disease


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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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