Genetic resistance of new popcorn hybrids to foliar diseases

• Main Authors: Fernando Teruhiko Hata, Marco de Araújo Rodovalho, Rafael Reccanello Barreto, Rafael Augusto Vieira, Dauri José Tessmann, Carlos Alberto Scapim
• Format: Article
• Language: English
• Published: Brazilian Society of Plant Breeding 2009-01-01
• Series: Crop Breeding and Applied Biotechnology
• Subjects: Zea mays; pathogens; multivariate analysis; canonical variables; cluster analysis.
• Online Access: http://www.sbmp.org.br/cbab/siscbab/uploads/c8129491-853a-3e1c.pdf

The level of genetic resistance to foliar diseases in 54 new simple popcorn hybrids was evaluated in fieldconditions. Two trials in a randomized complete block design were conducted in the 2006/07 growing season. The diseaseintensity in genotypes was compared by the area under the disease progress curve, expressing the severity. Significantdifferences (P ≤ 0.01) of resistance to southern rust (Puccinia polysora) northern leaf blight (Exserohilum turcicum) andPhaeosphaeria leaf spot (complex Phaeosphaeria maydis / Pantoea ananas) were observed. The cluster analysis detecteddifferent resistance levels to the series of leaf diseases. In 12 of the new hybrids the resistance level to the set of diseases wassimilar as in the commercial hybrid IAC 112, considered the best reference for leaf disease resistance among commercialpopcorn genotypes.