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Screening of maize genotypes for low Striga Asiatica stimulant production using the Agar Gel Technique

Author: Fasil Reda
Author: Butler, L.G.
Author: Gebisa Ejeta
Author: Ransom, J.K.
Year: 1994
Abstract: One of the best characterized mechanisms of resistance to the parasitic weed ( Striga check for this species in other resources ) is low germination stimulant exudation by host plants. Using a simple and rapid agar gel assay, 112 maize genotypes were tested for low stimulant production and haustorium initiation of Striga asiatica check for this species in other resources (L.) Kuntze. Most of the genotypes induced high level of germination of Striga seeds at distances more than 1.3 cm, from the crop seedling root to the furthest germination Striga seed. Germination distance highly correlated with rate of germination and was used as a quick way of determining the level of haustorial germination induced by the test genotypes. Some breeding lines such as PR 91A 496-13 and PR 91A 496-25 induced moderately low germination. B 37.91-952-1 induced the least germination distance (0.87cm). This is comparable to that of highly resistant sorghum varieties. The commercial varieties induced high level of germination. A similar procedure was followed to observe the rate of haustorium initiation. Despite the tendency to stimulate considerably high germination, some entries permitted very low haustorium initiation. The best three lines in terms of low haustorium initiation were PR 496-45, PR 91B 5323 33x34 and PR 91A 496-17. There was no relationship between germination distance and haustorium initiation.
Language: English
Publisher: Bioline International
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 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
Region: Global
Pages: 173-177
Journal issue: 2
Journal: African Crop Science Journal
Journal volume: 2
Keywords: Zea mays
Keywords: Selection
Keywords: Roots
Keywords: Exudation
Keywords: Parasitic plants
Keywords: Striga
Keywords: Pest resistance
Keywords: Weed control
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Audicence: Researchers

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

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