科研之友
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摘要
Em milho, varia es de desempenho agron mico s o comuns em ambientesdistintos, havendo resposta ainda mais diferenciada em h赤bridos simples. Este trabalho teve como objetivo avaliar o desempenho de novos h赤bridos simples de milho-pipoca, desenvolvidos pelo Programa de Melhoramento da Universidade Estadual de Maring芍, no noroeste do Paran芍. Para isso, avaliaram-se as caracter赤sticas agron micas de rendimento de gr os, capacidade de expans o, altura de planta, altura de espiga, resist那ncia 角 ferrugem polissora (Puccinia polysora), 角 helmintosporiose (Exserohilum turcicum) e 角 mancha branca(Phaeosphaeria maydis/Pantoea ananas). O experimento foi conduzido em blocos completos, com tratamentos ao acaso com tr那s repeti es, em Maring芍-PR, na safra 2006/2007. Os tratamentos foram 27 h赤bridos de linhagens S5 e as cultivares BRS Angela, IAC 112 e Jade. Constataram-se diferen as significativas (p ≒ 0,05) entre os h赤bridos para todas as caracter赤sticas avaliadas. O h赤brido proveniente da combina o das linhagens C e K expressou os melhores 赤ndices de rendimento de gr os e capacidade de expans o e foi suscept赤vel 角 ferrugem polissora. Os h赤bridos provenientes das linhagens L, H e Kdestacaram-se com rela o 角 resist那ncia 角 ferrugem polissora, enquanto os h赤bridos da linhagem G foram mais resistentes 角 helmintosporiose, e os das linhagens M e G, 角 mancha branca. In maize, variations on agronomic performance in distinctenvironments are common and more evident for one-way hybrids. The objective of this work was to evaluate the performance of new one-way popcorn hybrids developed by the Breeding Program of the State University of Maring芍, in northwestern Paran芍. The characteristics evaluated were: grain yield, popping expansion, plant height, ear height and the intensity of Southern rust (Puccinia polysora), Northern leaf blight (Exserohilum turcicum), and phaeosphaeria leaf spot (Phaeosphaeria maydis/Pantoea ananas). The assay was carried outinto randomized block design with three replications in Maring芍, state of Paran芍, Brazil, during the 2006/2007 cropping season. The treatments were 27 simple popcorn hybrids obtained from S5 endogamic inbreds and commercial cultivars BRS Angela, IAC 112 andJade. Significant differences (p ≒ 0.05) were verified among hybrids for all characteristics. The hybrid from C and K inbreds presented better indexes for grain yield and popping expansion; and was susceptible to Southern rust. About diseases, the hybrids from the L, H and K inbreds showed greater resistance levels to Southern rust, and hybrids from G inbred had better Northern l
