Plant Protect. Sci., 2013, 49(1):11-18 | DOI: 10.17221/57/2011-PPS

Infection process in resistant and susceptible maize (Zea mays L.) genotypes to Cercospora zeae-maydis (type II)

Herman John F. Lyimo1, Richard C. Pratt2, Reuben S.O.W. Mnyuku1
1 Department of Crop Science and Production, Sokoine University of Agriculture, Chuo Kikuu, Morogoro, Tanzania
2 Department of Plant and Environmental Sciences, New Mexico State University, Las Cruces, USA

The infection process of Cercospora zeae-maydis type II (syn. Cercospora zeina Meisel and Korsman) in resistant, moderately resistant and susceptible maize genotypes was studied in the greenhouse under artificial inoculation. The percent spore germination, germ tube growth and formation of mature appressorium on leaves at 24, 36, 48, and 72 h after inoculation did not differ between resistant, moderately resistant, and susceptible maize genotypes (P ≤ 0.05). More germlings were established after penetration on susceptible than resistant and moderately resistant maize genotypes at 72, 96, 120, and 144 h after inoculation. The hyphal wefts in cells of resistant and moderately resistant genotypes were shorter than in susceptible genotypes (P ≤ 0.05). The slow pathogen growth was associated with a reduced number of conidiophores per stroma, spores per unit area and smaller lesions. The reduced pathogen growth after penetration suggests possible involvement of pathogen growth inhibitory substances in maize resistance to C. zeae-maydis type II.

Keywords: Cercospora zeina; host resistance; maize

Published: March 31, 2013  Show citation

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Lyimo HJF, Pratt RC, Mnyuku RSOW. Infection process in resistant and susceptible maize (Zea mays L.) genotypes to Cercospora zeae-maydis (type II). Plant Protect. Sci. 2013;49(1):11-18. doi: 10.17221/57/2011-PPS.
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