Show simple item record

Análisis genético de la tolerancia a Cercospora spp. en líneas endogamicas de maíz tropical

Author: Vanegas-Angaritas, H.
Author: De-Leon, C.
Author: Narro, L.A.
Year: 2007
Abstract: Gray leaf spot of maize (Zea mays L.), caused by the fungus Cercospora zeae maydis Tehon & Daniels, has become an economically important disease in tropical humid maize growing areas of the Republic of Colombia. To implement an adequate program of selection and improvement of genetic tolerance to this disease, it was necesary to determine the inheritance of this tolerance. For this purpose, five highly tolerant and five-susceptible maize inbred lines were evaluated using a diallel design (Griffing Model 1), at the Centro Internacional de Agricultura Tropical (CIAT), Colombia. Parental lines and their crosses, both direct and reciprocal, were evaluated in three different environments using conservation tillage and were artificially inoculated using a mixture of gray leaf spot infected leaves collected from farmers’ fields. The variable Disease Index (DI; scale 1: resistant; 5: highly susceptible) of the parental lines and their direct and reciprocal crosses was determined in three environments, in fields planted under direct planting, artificially inoculated with inoculum prepared using leaves with symptoms of the disease collected from farmers’ fields. In the combined analysis, there were highly significant differences for parents, crosses (direct and reciprocal), general combining ability (GCA) and specific combining ability (SCA). There were no significant differences for either parents vs. crosses or for direct vs. reciprocal crosses. Consequently, heterosis was not important in DI (mean for parents: 2.97, and for crosses: 3.03) and no maternal effects were observed for these lines (mean for direct and reciprocal crosses: 3.03). GCA sum of squares (SS) was three fold of the SCA SS, meaning that additive gene effects were more important than non-additive gene effects. No parent×environment interaction was observed. Interaction of environment with crosses, GCA, and SCA were highly significant.
Format: PDF
Language: English
Publisher: Colegio de Postgraduados
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.
Alternative Title: Genetic analysis of tolerance to Cercospora spp. in tropical maize inbred lines
Type: Article
Region: Global
Pages: 35-43
Issue: 1
Volume: 41
Keywords: Cercospora zeae-maydis
Keywords: Specific Combining Ability
Keywords: General Combining Ability
Keywords: Reciprocal Effects
Keywords: Gray Leaf Spot of Maize
Publisher URI:
Agrovoc: ZEA MAYS
Journal: Agrociencia

Files in this item


This item appears in the following Collection(s)

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

Show simple item record