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Screening and source of resistance to downy mildew (Peronosclerospora sorghi) in maize (Zea mays L.).

N. Premalatha, K. M. S. Sundaram, S. Arumugachamy

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Abstract

Host plant resistance is an effective and economical means of controlling downy mildew disease in maize (Zeamays L.). The present study was initiated with screening of 100 maize inbreds against downy mildew. The parents UMI 57 and UMI 743 showed resistance to downy mildew. Among 56 hybrids, two hybrids viz., CM 500 x UMI 39 and CM 500 x UMI 57 were found to be highly resistant (100 %) to downy mildew with higher grain yield. The disease reaction of the progenies ranged from zero to 100 per cent. The maximum disease incidence was registered in CM 500. The incidence was recorded nil in UMI 57. All downy mildew resistant hybrids were found to possess significantly higher concentration of total phenols, soluble protein (mg/g), peroxidase and polyphenol oxidase. Hence these biochemical substances could have a possible role in the resistance behaviour of the genotypes against downy mildew.

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What this paper is about

Host plant resistance is an effective and economical means of controlling downy mildew disease in maize (Zeamays L.). The present study was initiated with screening of 100 maize inbreds against downy mildew. The parents UMI 57 and UMI 743 showed resistance to downy mildew. Among 56 hybrids, two hybrids viz., CM 500 x UMI 39 and CM 500 x UMI 57 were found to be highly resistant (100 %) to downy mildew with higher grain yield. The disease reaction of the progenies ranged from zero to 100 per cent. The maximum disease incidence was registered in CM 500. The incidence was recorded nil in UMI 57. All downy mildew resistant hybrids were found to possess significantly higher concentration of total phenols, soluble protein (mg/g), peroxidase and polyphenol oxidase. Hence these biochemical substances could have a possible role in the resistance behaviour of the genotypes against downy mildew.

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Available abstract

Host plant resistance is an effective and economical means of controlling downy mildew disease in maize (Zeamays L.). The present study was initiated with screening of 100 maize inbreds against downy mildew. The parents UMI 57 and UMI 743 showed resistance to downy mildew. Among 56 hybrids, two hybrids viz., CM 500 x UMI 39 and CM 500 x UMI 57 were found to be highly resistant (100 %) to downy mildew with higher grain yield. The disease reaction of the progenies ranged from zero to 100 per cent. The maximum disease incidence was registered in CM 500. The incidence was recorded nil in UMI 57. All downy mildew resistant hybrids were found to possess significantly higher concentration of total phenols, soluble protein (mg/g), peroxidase and polyphenol oxidase. Hence these biochemical substances could have a possible role in the resistance behaviour of the genotypes against downy mildew.

Key concepts: Downy mildew, Biology, Hybrid, Agronomy, Zea mays, Plant disease resistance, Horticulture, Biochemistry

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Screening and source of resistance to downy mildew (Peronosclerospora sorghi) in maize (Zea mays L.). — Research Paper | ScholarLens