Eficiência de índices fenotípicos de comprimento de raiz seminal na avaliação de plantas individuais de milho quanto à tolerância ao alumínio

Martins, Paulo Roberto; Parentoni, S. N.; Lopes, M. A.; Paiva, Edílson

doi:10.1590/s0100-204x1999001000017

Cited by 10 publications

(11 citation statements)

References 12 publications

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“…A população F 1 do cruzamento entre os parentais P33 e IAC-1003 mostrou todas as plântulas tolerantes, sugerindo que o parental P33 possui um par de alelos dominantes para tolerância à toxicidade de alumínio, como verificado em aveia (Sánchez-Chacón et al, 2000) e em trigo comum (Camargo, 1981;1999;Camargo et al, 2000a,b). Nessa mesma população, em geração F 2 , observou-se segregação de 260 plantas tolerantes para cem plantas sensíveis, aproximando-se da proporção esperada de 3:1, com valor de probabilidade de 0,22 de não terem ocorrido ao acaso.…”

Section: Resultsunclassified

“…Existem vários métodos utilizados para a avaliação da tolerância ao alumínio em programas de melhoramento genético de milho (Martins et al, 1999), trigo (Camargo et al, 2006), aveia (Sánchez-Chacón et al, 2000) e arroz (Ferreira et al, 1997). Há um consenso de que características baseadas no desenvolvimento do sistema radicular, empregando soluções nutritivas, são os melhores critérios para seleção de plantas tolerantes.…”

Section: Introductionunclassified

“…Em genótipos de aveia e de trigo, observou-se a tolerância ao Al 3+ determinada por somente um gene com dominância do alelo que condiciona a tolerância (Sánchez-Chacón et al, 2000;Camargo, 1981;1999;Camargo et al, 2000a,b). Entretanto, Aniol (1990) obteve resultados em trigo indicando que a tolerância ao Al 3+ é um caráter complexo, controlado por vários genes, genes modificadores de menor efeito e, provavelmente, por genes controlando a supressão de genes para a tolerância ao Al 3+ .…”

Section: Introductionunclassified

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Herança da tolerância à toxicidade de alumínio em trigo duro

Guercio

Camargo²

2011

Bragantia

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ResumoO trigo duro (Triticum durum Desf.), também conhecido como "trigo para macarrão", caracteriza-se pela farinha amarelada (sêmola) adequada para o preparo de massas. No Brasil ainda não ocorre seu cultivo extensivo em decorrência, principalmente, de problemas com sua adaptação aos solos ácidos, com níveis tóxicos de alumínio. Visando estimar a herança da tolerân-cia à toxicidade de alumínio efetuaram-se cruzamentos entre o genótipo de trigo duro tolerante, P33 e o sensível, IAC-1003 para a obtenção do híbrido em geração F 1 e a seguir das gerações F 2 , F 3 , RC 1 F 1 , RC 2 F 1 , RC 1 F 2 e RC 2 F 2 . Todos os genótipos foram testados em soluções nutritivas e a tolerância à toxicidade de alumínio foi medida pela capacidade de crescimento da raiz primária central em solução nutritiva completa, após tratamento de 48 horas em solução contendo 2 mg L -1 de Al 3+ . O genótipo P33 diferiu do IAC-1003 por um par de alelos dominantes para a tolerância à presença dessa concentração de alumínio nas soluções nutritivas e pode ser usado como fonte de tolerância ao alumínio em programas de melhoramento de trigo duro.Palavras-chave: Triticum durum Desf., genes dominantes, solos ácidos, melhoramento genético. Inheritance of aluminum toxicity in durum wheatAbstract Durum wheat (Triticum durum Desf.), also known as "pasta wheat", is characterized to produce yellow flour (semolina) adequate for pasta elaboration. In Brazil, its extensive cultivation is limited by the low crop adaptability to acid soils, with toxic aluminum levels. Aiming to estimate the inheritance of the aluminum toxicity tolerance, crosses were made between tolerant durum wheat genotype P33 and the sensitive IAC-1003 to obtain the hybrid in F 1 generation and subsequent generations F 2 , F 3 , BC 1 F 1 , BC 2 F 1 , BC 1 F 2 and BC 2 F 2 . All genotypes were tested in nutrient solutions and the aluminum toxicity tolerance was measured by the growth capacity of the primary central root after 48 hours of treatment with 2 mg L -1 of aluminum in nutrient solution. The genotype P33 has differed from IAC-1003 by one pair of dominant alleles for the tolerance at the presence of this aluminum concentration in the nutrient solution and it could be used as source of aluminum tolerance in durum wheat breeding programs.

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Section: Resultsunclassified

Section: Introductionunclassified

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Herança da tolerância à toxicidade de alumínio em trigo duro

Guercio

Camargo²

2011

Bragantia

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“…Being abundant in tropical soils, the aluminum (Al) is one of the major obstacles to the cultivation on these regions, especially in soils with high clay content (Martins et al, 1999). The absorption and accumulation of Al affect cells and organelles in physiological, morphologic and cytogenetic level, reducing nutrient absorption, growth and development of roots and shoots, significantly impairing the establishment of the crop and its yield (Braccini et al 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have reported genotypes of the same species exhibiting differential behavior in soils with high Al content, which is important for breeding programs, in the selection of tolerant genotypes (Martins et al, 1999;Braccini et al, 2000;Custodio et al, 2002;Crestani et al, 2009;Macedo & Lopes, 2008;Rosado et al, 2012). The importance of selecting genotypes tolerant to Al is even greater when you want to cultivate on soils of savanna/cerrado, where the costs for the neutralization of Al toxicity can be high and is not always efficient to make a correction in the subsurface soil layers.…”

Section: Introductionmentioning

confidence: 99%

Selection of genotypes of Jatropha curcas L. for aluminium tolerance using the solution-paper method

Martins

Lopes

Laviola

et al. 2013

Idesia

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The study objective was to determinate the concentration of aluminum that allow to distinguish genotypes of Jatropha for tolerance to this element, using the solution-paper method. For this study, seeds of four genotypes of Jatropha, were germinated at different Al concentrations (0, 15, 40, 80 and 120 mg L -1 ). After 14 days, the root length was measured for all treatments. It was observed that there are different tolerance levels for the genotypes. The root length decreased exponentially with the increase of the Al concentration. The solution-paper method allows the selection of genotypes of Jatropha in relation to aluminum tolerance and the concentration of 40 mg L -1 of Al is recommended to discriminate the tolerance of genotypes to this element.Key words: Jatropha curcas, mineral nutrition, toxicity, genetic variability. Al (0, 15, 40, 80 RESUMEN El objetivo de la investigación fue evaluar el efecto de la concentración del aluminio en solución que mejor diferencia la tolerancia al aluminio en genotipos de Jatropha, utilizando el método papel-solución. Semillas de cuatro genotipos diferentes de Jatropha (CNPAE-248, CNPAE-301,CNPAE-308 y CNPAE-144) fueron germinadas en diferentes concentraciones de

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Factors contributing to the development of aluminum resistance in the Madeiran maize germplasm

Carvalho¹,

Śląski

Abreu

et al. 2004

Z. Pflanzenernähr. Bodenk.

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Summary ± ZusammenfassungForty genotypes representing maize genetic diversity from the Island of Madeira were screened for resistance to aluminum (Al) in nutrient solution. Seeds of maize were obtained from local farmers from field plots spread around the island in a range of altitudes from 99 to 1000 m above sea level. The content of ionic aluminum and the pH of soils cultivated with maize were determined. The mean pH value of all examined soils was 4.9, while the mean ionic Al content was 0.76 cmol kg ±1 . Seventy-two hours (h) exposure to 100 and 200 lM Al followed by a 48 h recovery period of 4-day old seedlings revealed significant differences in Al resistance in the Madeiran maize germplasm. Root survival and regrowth exceeding 80 % of the seedlings were observed in 22 and 8 of the tested genotypes screened at 100 and 200 lM Al in nutrient solution. High Al resistance among Madeiran maize genotypes appeared not to be associated with the lower pH of soil, and did not correlate with the amount of soil Al 3+ or the altitude at the site of collection. The high level of Al resistance of the maize cultivars indicates an initial genetic trait enhanced by open pollination of maize. Zur Entstehung von Aluminiumresistenz von Maissorten aus Madeira beitragende Faktoren

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Eficiência de índices fenotípicos de comprimento de raiz seminal na avaliação de plantas individuais de milho quanto à tolerância ao alumínio

Cited by 10 publications

References 12 publications

Herança da tolerância à toxicidade de alumínio em trigo duro

Herança da tolerância à toxicidade de alumínio em trigo duro

Selection of genotypes of Jatropha curcas L. for aluminium tolerance using the solution-paper method

Factors contributing to the development of aluminum resistance in the Madeiran maize germplasm

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