Classification of Brazilian wheat cultivars for aluminium toxicity in acid soils

Sousa, C. N. A. de

doi:10.1111/j.1439-0523.1998.tb01929.x

Cited by 40 publications

(23 citation statements)

References 11 publications

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“…Genetic analysis of various wheat genotypes collected worldwide revealed that Al 3+ tolerance might have originated independently in the USA, Brazil, and China (Hu et al, 2008;Raman et al, 2008). However, to date, only the Al-tolerant wheat lines in Brazil have been studied extensively (Berzonsky, 1992;Riede and Anderson, 1996;De Sousa, 1998;Ma et al, 2005). Thus far, only limited numbers of wheat lines from China have been evaluated for Al tolerance (Hu et al, 2008), although significant genetic variation in Al tolerance has occurred among wheat landraces and cultivars (Stodart et al, 2007;Zhou et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Although some Al-tolerant wheat lines have been identified, additional Al-tolerant germplasms are required to improve modern wheat crops (Berzonsky, 1992;Riede and Anderson, 1996;De Sousa, 1998;Hu et al, 2008). One of the most important Al-tolerant genetic sources was traced to Brazil, where acidic soils are predominant in wheat cultivation zones.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most important Al-tolerant genetic sources was traced to Brazil, where acidic soils are predominant in wheat cultivation zones. Examples include the Al-tolerant genes in wheat lines BH 1146 (Ponta Grossa 1//Fronteira/ Mentana) and Atlas 66 (Frondoso//Redhart 3/Noll 28), which share the common ancestor Polyssu that originated from Brazil (Ponta Grossa 1 was selected from Polyssu, and Polyssu was a parent of Frondoso) (Berzonsky, 1992;Riede and Anderson, 1996;De Sousa, 1998;Garvin and Carver, 2003). Besides these, the Al-tolerant genes in some wheat lines such as ET8 and Carazinho were also traced to wheat from Brazil (Zhou et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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TaALMT1 promoter sequence compositions, acid tolerance, and Al tolerance in wheat cultivars and landraces from Sichuan in China

Han

Dai²,

Liu³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Previous genetic studies on wheat from various sources have indicated that aluminum (Al) tolerance may have originated independently in USA, Brazil, and China. Here, TaALMT1 promoter sequences of 92 landraces and cultivars from Sichuan, China, were sequenced. Five promoter types (I', II, III, IV, and V) were observed in 39 cultivars, and only three promoter types (I, II, and III) were observed in 53 landraces. Among the wheat collections worldwide, only the Chinese Spring (CS) landrace native to Sichuan, China, carried the TaALMT1 promoter type III. Besides CS, two other Sichuan-bred landraces and six cultivars with TaALMT1 promoter type III were identified in this study. In the phylogenetic tree constructed based on the TaALMT1 promoter sequences, type III formed a separate branch, which was supported by a high bootstrap value. It is likely that TaALMT1 promoter type III originated from Sichuan-bred wheat landraces of China. In addition, the Aluminum tolerance of Sichuan-bred wheat landraces with promoter type I showed the lowest Al tolerance among all landraces and cultivars. Furthermore, the cultivars with promoter type IV showed better Al tolerance than landraces with promoter type II. A comparison of acid tolerance and Al tolerance between cultivars and landraces showed that the landraces had better acid tolerance than the cultivars, whereas the cultivars showed better Al tolerance than the landraces. Moreover, significant difference in Al tolerance was also observed between the cultivars raised by the National Ministry of Agriculture and by Sichuan Province. Among the landraces from different regions, those from the East showed better acid tolerance and Al tolerance than those from the South and West of Sichuan. Additional Al-tolerant and acid-tolerant wheat lines were also identified.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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TaALMT1 promoter sequence compositions, acid tolerance, and Al tolerance in wheat cultivars and landraces from Sichuan in China

Han

Dai²,

Liu³

et al. 2013

Genet. Mol. Res.

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“…Os genótipos foram testados em área de solo caracterizado como Latossolo Vermelho distrófico típico, textura argilosa (Streck, 2002) Sousa (1998), que classifica os genótipos com escala de notas de 0 a 5 em relação a tolerância/sensibilidade ao alumínio, em que: altamente resistente (0,50-0,80); resistente (0,81-1,50); moderadamente resistente (1,51-2,50), moderadamente suscetível (2,51-3,50); suscetível (3,51-4,50) e altamente suscetível (4,51-5,0). O critério dos escores utilizado foi: 0,5, altamente resistente; 1, resistente, plantas normais e vigorosas com perfilho abundante; 2, moderadamente resistente, plantas normais, levemente menos vigorosas e com menos perfilhos do que o grupo anterior; 3, moderadamente suscetíveis, desenvolvimento das plantas intermediário; 4, suscetíveis, plantas deficientes, sem perfilho; e 5, altamente suscetíveis, plantas mortas ou com desenvolvimento muito deficiente.…”

Section: Methodsunclassified

Tolerância de genótipos de cereais de inverno ao alumínio em cultivo hidropônico e em campo

Portaluppi

Brammer

Magalhães

et al. 2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar a capacidade de crescimento radicular de 75 genótipos de cereais de inverno em cultivo hidropônico, em diferentes concentrações de alumínio, avaliar a relação entre o grau de tolerância/sensibilidade, em solução hidropônica, e a resistência/suscetibilidade ao crestamento em campo. Os cereais cevada, triticale, centeio, trigo e Aegilops tauschii foram avaliados em hidroponia, com concentrações de Al 3+ que variaram entre 0,5 (cevada), 2 e 6 (triticale), 6 e 10 (centeio) e 2 mg L -1 (trigo e Ae. tauschii). Os delineamentos experimentais foram inteiramente casualizados. Em campo, foram avaliados os mesmos genótipos, exceto Ae. tauschii, em solo com pH 4,4 e 4,85, corrigido a 1/2 e 1/4 do índice SMP. Utilizou-se uma escala de notas com variação de escores de 0,5 (altamente resistente) a 5 (altamente suscetível). Foi observada elevada relação entre a tolerância ao alumínio em hidroponia e a resistência ao crestamento em campo. A seleção de cereais em meio hidropônico pode ser considerada eficiente como ferramenta de apoio aos programas de melhoramento genético para essa característica.Termos para indexação: Hordeum vulgare, Secale cereale, Triticum aestivum, crestamento, resistência, suscetibilidade, toxicidade. Tolerance of small graine cereal genotypes to aluminum on hydroponic and field cultivationAbstract -The objective of this work was to determine the root growth capacity of 75 genotypes of small graine cereals in hydroponic culture under different aluminum concentrations, and to assess the relationship betwen the level of tolerance/sensitivity in hydroponic solution and the resistance/susceptibility index in the field. Barley, triticale, rye, wheat and Aegilops tauschii were evaluated in hydroponics, with Al 3+ concentrations that varied between 0.5 (barley), 2 and 6 (triticale), 6 and 10 (rye) and 2 mg L -1 (wheat and Ae. tauschii). The experiments' designs were completely randomized. In the field trial, the same genotypes were assessed, except for Ae. tauschii, in soil with pH 4.4 and 4.85 adjusted to 1/2 and 1/4 of the SMP index. A score scale ranging from 0.5 (highly resistant) to 5 (highly susceptible) was used. A strong relationship between aluminum tolerance in hydroponics and resistance to blight in the field was observed. Cereals selection in hydroponic medium can be considered an efficient tool to support breeding programs for this characteristic.Index terms: Hordeum vulgare, Secale cereale, Triticum aestivum, blight, resistance, sensitivity, toxicity. IntroduçãoA toxicidade do alumínio, nos solos ácidos, é um dos fatores que mais limitam a produção agropecuária. No Brasil, 68% dos solos têm elevada acidez, toxicidade de alumínio e baixa disponibilidade de fósforo (Guimarães, 2005). Cultivares de cereais de inverno suscetíveis ao Al 3+ apresentam, como sintomas, raízes atrofiadas, folhas amarelecidas, formação de espigas rudimentares, com poucas ou até mesmo sem espiguetas, o que é conhecido como crestamento.A combinação de métodos de análise como o cu...

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“…However, in Brazil, wheat lines were selected for their ability to grow in acid soils. The Toropi cultivar, released in 1965 (Sousa, 1998), is well known for its Al and low-P tolerance (Rosa & Camargo, 1990), which has been associated to the greater root volume produced by this cultivar (Wiethölter, 2004). Anahuac cultivar, on the other hand, is responsive to increasing P availability and is sensitive to low P.…”

Section: Introductionmentioning

confidence: 99%

Low-P tolerance mechanisms and differential gene expression in contrasting wheat genotypes

Espindula

Minella

Delatorre

2009

Pesq. agropec. bras.

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-The objectives of this study were to determine low-P tolerance mechanisms in contrasting wheat genotypes and to evaluate the association of these mechanisms to differential gene expression. Wheat seedlings of cultivars Toropi (tolerant to low-P availability) and Anahuac (sensitive) were evaluated. Seedlings were hydroponically grown in the absence or presence of P (1.0 mmol L -1 ) during three different time periods: 24, 120 and 240 hours. Free phosphate (Pi) and total P contents were measured in shoots and roots. The experiment's design was in randomized blocks with three replicates, each formed by ten plants. The relative expression of genes encoding the malate transporter TaALMT1 and the transcription factor PTF1 was evaluated. Phosphorus starvation beyond ten days increased the expression of TaALMT1 only in 'Toropi'. PTF1's expression was early induced in both genotypes under P starvation, but remained significant after ten days only in 'Toropi'. Shoot Pi concentration in 'Toropi' was independent from P availability; under starvation, 'Toropi' favored the maintenance of shoot Pi concentration. The low-P tolerance of Toropi cultivar at initial growth stages is mainly due to its ability to maintain constant the Pi shoot level.Index terms: Triticum aestivum, phosphorus starvation, translocation. Mecanismos de tolerância à deficiência de fósforo e expressão diferenciada de genes em genótipos de trigo contrastantesResumo -Os objetivos deste estudo foram determinar os mecanismos da tolerância à deficiência de P em genótipos de trigo contrastantes e avaliar a associação desses mecanismos à expressão diferenciada de genes. Foram avaliadas plântulas das cultivares de trigo Toropi (tolerante à deficiência de P) e Anahuac (sensível). As plântulas foram cultivadas em hidroponia, na ausência ou presença (1,0 mmol L -1 ) de P, durante três períodos de tempo: 24, 120 e 240 horas. Os teores de fosfato livre (Pi) e P total foram medidos na parte aérea e nas raízes. O delineamento experimental foi em blocos ao acaso com três repetições, cada uma formada por dez plantas. Foi avaliada a expressão relativa dos genes que codificam o transportador de malato TaALMT1 e o fator de transcrição PTF1. Períodos de deficiência de P superiores a dez dias aumentaram a expressão de TaALMT1 somente em 'Toropi'. A expressão de PTF1 foi induzida em ambos os genótipos no início da deficiência, porém manteve-se significativa após dez dias somente em 'Toropi'. A concentração de Pi livre na parte aérea em 'Toropi' foi independente da disponibilidade de P; sob limitação, 'Toropi' favoreceu a manutenção da concentração de Pi na parte aérea. A tolerância à deficiência de P em 'Toropi' nos estádios iniciais de crescimento é devida principalmente à sua capacidade de manter constante a concentração de Pi na parte aérea.Termos para indexação: Triticum aestivum, deficiência de fósforo, translocação.

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Classification of Brazilian wheat cultivars for aluminium toxicity in acid soils

Abstract: Aluminium (Al) toxicity is an important limiting factor for wheat Triticum aestivum L. adaptation to acid soils in different regions of Brazil.

Cited by 40 publications

References 11 publications

TaALMT1 promoter sequence compositions, acid tolerance, and Al tolerance in wheat cultivars and landraces from Sichuan in China

TaALMT1 promoter sequence compositions, acid tolerance, and Al tolerance in wheat cultivars and landraces from Sichuan in China

Tolerância de genótipos de cereais de inverno ao alumínio em cultivo hidropônico e em campo

Low-P tolerance mechanisms and differential gene expression in contrasting wheat genotypes

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