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    Effects of Early and Late Harvest on Agronomic Performance and Stability of Late Blight Resistant (R-gene Free) Potato Genotypes

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    Date
    2014
    Author
    Nyankanga, Richard
    Kiplagat, Willy
    Rama, Narla
    Shibairo, Solomon
    Kabira, Jackson
    Landeo, Juan
    Olanya, Modesto
    Type
    Article; en_US
    Language
    en
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    Abstract
    Late blight is an important constraint to potato production and genotype resistance is an effective disease control mesure. Ten late blight resistant potato genotypes (R-gene free) were assessed for yield performance and stability at early (90 days) and late harvest (120 days) at two locations in Kenya during two years. Significant differences ( P < 0.05) in area under disease progress curves (AUDPC) were detected among potato genotypes. Resistant genotypes free of R-genes had significantly ( P < 0.05) higher yield at late than early harvest, perhaps due to increased tuber bulking period. The rank of genotypes for AUDPC, late blight resistance, and tuber yield varied across seasons and locations (environment). Additive main effects and multiplicative interaction (AMMI) analysis of tuber yield and late blight resistance resulted in significant ( P < 0.05) effects of genotypes (G) and environments (E). The propor- tion of genotypic variance was larger than the environmental variance and the G × E interactions. For tuber yield, the G, E, and G × E interactions accounted for 42.9, 39.6 and 17.5%; and 53.4, 29.7, and 16.9% at early and late harvests, respectively. For AUDPC, G, E, and G × E accounted for 80.2, 5.0, and 14.8%; as well as 82.3, 4.6, and 13% for early and late harvests, respectively. The resistance of potato genotypes without R-genes varied. Selective deployment of resistant genotypes can improve potato tuber yield
    URI
    http://link.springer.com/article/10.1007/s12892-013-0103-9
    http://hdl.handle.net/11295/72919
    Citation
    Richard Nyankanga, Willy Kiplagat, Rama Narla, Solomon Shibairo, Jackson Kabira, Juan Landeo, Modesto Olanya (2014). Effects of Early and Late Harvest on Agronomic Performance and Stability of Late Blight Resistant (R-gene Free) Potato Genotypes. Journal of Crop Science and Biotechnology, 17(2), pp 89-9
    Publisher
    University of Nairobi
    Subject
    AMMI analysis, harvest dates, Phytophthora infestans , R-gene free genotypes, Solanum tuberosum , yield
    Collections
    • Faculty of Agriculture & Veterinary Medicine (FAg / FVM) [5481]

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