Comportamento de Linhagens Elites de Milho para Resistência aos Enfezamentos

Silveira, Flávio Trevizoli; Junqueira, B.G.; Silva, P.C.; Môro, José Roberto

doi:10.18512/1980-6477/rbms.v5n3p431-442

Cited by 5 publications

(4 citation statements)

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“…The main purpose of popcorn breeding programs is to develop lines resistant to foliar diseases (18), which should be combined with the search for materials tolerant to phosphorus scarcity, the condition of most Brazilian soils (5). Mineral nutrients play specific roles in plant metabolism, affecting their growth and production, as well as the reaction of plants to infectious agents, due to anatomical and biochemical changes (pre and post-formed physical and biochemical barriers) (11).…”

Section: Palavras-chave: Zea Mays; Resistencia Genética; Fertilizantementioning

confidence: 99%

Reaction of popcorn lines (s7) cultivated in distinct phosphorus levels to Bipolaris maydis infection

et al. 2019

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Popcorn culture is highly susceptible to helminthosporiosis (Bipolaris maydis) (h-Bm). The genetic breeding of this culture should prioritize resistance to h-Bm and develop cultivars that offer greater crop sustainability, especially in soils with phosphorus (P) scarcity. P-mineral is usually supplied to maize culture by the application of phosphate fertilizers, which are produced from mineral sources rich in P, the natural reserves of which will be depleted in the medium term. With the aim of selecting popcorn genotypes resistant to h-Bm and with higher P utilization capacity, the present study evaluated h-Bm incidence and severity for 25 popcorn lines (S7) cultivated under high and low phosphorus conditions. There was a significant interaction between genotype (lines) and P fertilization for h-Bm resistance, expressed as disease severity values in the first ear leaf. There was genetic variability for disease resistance. The incidence analysis identifies the lines L-65 L-69, L-70 and L-76 as potentially resistant genotypes, presenting low mean values of h-Bm. The severity analysis, however, presents L-69, L-76, P-3 and P-7 genotypes as potentially resistant in environments with fertilization and without fertilization. The obtained data show that the lines L-69 and L-76 had the best resistance performance in both environments. The genetic resistance to h-Bm can somehow correlate with the response to P fertilization at planting in soils with low natural fertility.

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Section: Palavras-chave: Zea Mays; Resistencia Genética; Fertilizantementioning

confidence: 99%

Reaction of popcorn lines (s7) cultivated in distinct phosphorus levels to Bipolaris maydis infection

et al. 2019

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“…Genetic resistance is effective to control maize leaf diseases (PROCHNO et al, 2016); therefore, genetic breeding programs seek to develop inbred lines and hybrids with higher resistance levels (SILVEIRA et al, 2006). Several studies in the literature point to a genetic variability for resistance to leaf diseases in some maize cultivars (NIHEI;FERREIRA, 2012;VIEIRA et al, 2012), but a few of them approach the genetic resistance of inbred lines (SILVEIRA et al, 2006;VIVEK et al, 2010;SAITO et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies in the literature point to a genetic variability for resistance to leaf diseases in some maize cultivars (NIHEI;FERREIRA, 2012;VIEIRA et al, 2012), but a few of them approach the genetic resistance of inbred lines (SILVEIRA et al, 2006;VIVEK et al, 2010;SAITO et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Severity of leaf diseases in maize inbred lines with different kernel hardness in two sowing seasons

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Mendes

et al. 2018

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Resistance of maize inbred lines to major leaf diseases should be characterized for the development of new hybrids in breeding programs. Thus, this study aimed to assess the severity of leaf diseases in maize inbredlines with different kernel hardnessand two sowingseasons. We assessed four inbred lines and one check hybrid with dent kernels and four inbred lines and a check hybrid with flint kernels. Treatments were conducted in two sowing seasons, one in October, and another in December 2013. The symptoms of gray leaf spot (Cercospora zeae-maydis), northern leaf blight (Exserohilum turcicum), and white leaf spot (a complex of Phaeosphaeria maydis and Pantoea ananatis) were assessed every 10 days from flowering. The area under the disease progress curve was also calculated. Severity level of the diseases was higher in inbred lines when compared to the check hybrds (AG8041 PRO and P30R50YH), regardless of kernel hardness. Dent-kernel inbred lines showed a higher severity of northern leaf blight symptoms when compared to flint-kernelones. It is worth mentioning that disease severity increased as sowing was delayed. Keywords: Cercospora zeae-maydis. Exserohilum turcicum. Pantoea ananatis. Phaeosphaeria maydis. Zea mays. ResumoA caracterização de linhagens de milho quanto à resistência às principais doenças é fundamental para o desenvolvimento de novos híbridos em programas de melhoramento. Assim, o objetivo deste trabalho foi avaliar a severidade de doenças foliares em linhagens de milho com diferentes texturas de grãos em duas épocas de semeadura. Foram avaliadas quatro linhagens e um híbrido testemunha com grãos dentados e quatro linhagens e um híbrido testemunha com grãos duros. Os tratamentos foram conduzidos em duas épocas de semeadura, em outubro e em dezembro de 2013. A partir do florescimento, a cada 10 dias, foram avaliadas as doenças foliares cercosporiose (Cercospora zeae-maydis), helmintosporiose (Exserohilum turcicum) e mancha branca (complexo Phaeosphaeria maydis/Pantoea ananatis). Foi calculada a área abaixo da curva do progresso das doenças (AACPD foi maior nas linhagens, comparativamente aos híbridos testemunhas AG8041 PRO e P30R50YH, independentemente da textura dos grãos. As linhagens de textura dentada apresentaram maior severidade de sintomas da helmintosporiose, quando comparada às linhagens de grãos duros. Houve aumento da severidade das doenças avaliadas com o atraso da semeadura.

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“…org/10.1590/brag.2014.002 Bragantia, Campinas, v. 73, n. 1, p. [65][66][67][68][69][70][71]2014Fitossanidade | Artigo no manejo integrado de doenças na cultura do milho. Dessa forma, o desenvolvimento de linhagens resistentes a doenças foliares é um dos objetivos dos programas de melhoramento genético de milho (Silveira et al, 2006).…”

Section: Introductionunclassified

Análise dialélica para resistência a ferrugem polissora em milho em diferentes níveis de adubação fosfatada

et al. 2014

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A avaliação de germoplasmas como ferramenta na busca de genes que confiram resistência a doenças na cultura do milho tem sido meta constante em programas de melhoramento. Com esse intuito, determinou-se, por meio de cruzamento dialélicos, a capacidade geral (CGC) e específica (CEC) de combinação para resistência a Puccinia polysora de oito híbridos comerciais de milho em diferentes níveis de adubação fosfatada. Cultivaram-se 56 combinações híbridas (F1s e recíprocos) e oito genitores em dois ambientes distintos quanto à disponibilidade de fósforo (baixo e alto P) e avaliou-se a severidade de ataque da ferrugem polissora, de acordo com a área abaixo da curva de progresso da doença (AACPD). A análise de variância conjunta indicou que os híbridos diferiram significativamente (p<0,01) quanto à curva de progresso da ferrugem polissora, sinalizando a existência de variabilidade genética entre eles na resistência à incidência da doença. O maior valor do quadrado médio da CGC comparado a CEC evidenciou, nesses genitores, maior contribuição da ação gênica aditiva no controle da resistência à ferrugem polissora. As combinações híbridas recíprocas P30F53 x AG 8060 e TRUCK x BM 2202 apresentaram as maiores médias negativas de CEC, em ambientes de baixo e alto fósforo, respectivamente, e foram classificadas, assim, como promissoras para obtenção de resistência à ferrugem polissora.Palavras-chave: zea mays, puccinia polysora, estresse biótico, melhoramento genético, resistência genética. Diallel analysis for resistance to southern rust in corn at different levels of phosphorus fertilization AbstractThe evaluation of germplasm as a tool in search of disease resistance genes in corn has been a constant target in breeding programs. With this end, it was determined through diallel crossing, the general (GCA) and specific combining ability (SCA) for resistance to Puccinia polyssora eight commercial corn hybrids at different levels of phosphorus fertilization. Were cultured 56 hybrid combinations (F1's and reciprocals) and eight parents in two different environments as the availability of phosphorus (low and high P), and evaluated the severity of disease attack, according to the area below the curve of disease progress. The analysis of variance indicated that the hybrids differed significantly (p<0.01) regarding the progress curve polissora rust, indicating the existence of genetic variability among hybrids in resistance to disease incidence. The largest mean square of GCA compared to SCA showed, these parents, the greatest contribution of additive gene action in the control of rust resistance polissora. The reciprocal hybrids P30F53 x AG 8060 and TRUCK x BM 2202 showed the largest negative average SCA in environments of low and high phosphorus, respectively, classified as promising for obtaining polissora rust resistance.

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Comportamento de Linhagens Elites de Milho para Resistência aos Enfezamentos

Cited by 5 publications

References 0 publications

Reaction of popcorn lines (s7) cultivated in distinct phosphorus levels to Bipolaris maydis infection

Reaction of popcorn lines (s7) cultivated in distinct phosphorus levels to Bipolaris maydis infection

Severity of leaf diseases in maize inbred lines with different kernel hardness in two sowing seasons

Análise dialélica para resistência a ferrugem polissora em milho em diferentes níveis de adubação fosfatada

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