Manganese nutrition and accumulation of phenolics and lignin as related to differential resistance of wheat genotypes to the take-all fungus

Rengel, Zed; Graham, Robin D.; Pedler, Judith F.

doi:10.1007/bf00016291

Cited by 39 publications

(17 citation statements)

References 31 publications

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“…Uma correlação direta entre a tolerância ao Al +3 e a coloração das raízes com hematoxilina férrica é relatada em diversos trabalhos da literatura (POLLE et al, 1978;Wagatsuma et al, 1995;DELHAIZE et al, 1993). Todavia, RYAN et al (1993) (LENOBLE et al, 1996). Embora o número de primórdios seja aumentado sob estresse de Al +3 (Figuras 2B,F), tal fato não resulta em maior ramificação das raízes (Figura 1A), uma vez que esses primórdios, ao entrarem em contato com o Al +3 , também passam a sofrer inibição (Bennet e Breen, 1991).…”

Section: Resultsunclassified

“…A determinação dos teores de compostos fenólicos solúveis foi realizada a partir de amostras frescas de raízes e de parte aérea, pesando 0,5 g, coletadas em plantas expostas ou não ao Al +3 durante 10 dias, homogeneizadas em almofariz de porcelana na presença de 4 mL da mistura de metanol:clorofórmio:água (12:5:3, v/v) (RENGEL et al, 1993). Alíquotas dos materiais obtidos após centrifugação foram adicionadas ao reagente alcalino de Folin-Ciocalteau (JENNINGS, 1981).…”

Section: Para Determinar Os Efeitos Do Alunclassified

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Alterações morfológicas e acúmulo de compostos fenólicos em plantas de sorgo sob estresse de alumínio

2007

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. As análises da morfologia externa e interna dos ápices radiculares de plantas tratadas com Al +3 também foram muito similares entre as duas cultivares, não permitindo a utilização dessas características para seleção entre a cultivar sensível e a tolerante. O maior acúmulo de lignina e, principalmente, a menor produção de compostos fenólicos, observados na presença do Al +3 nas raízes das plantas da cultivar tolerante (BR006R), são parâmetros que possibilitam a discriminação das cultivares quanto à tolerância ao Al +3 .Palavras-Chave: alumínio, morfologia, fenólicos, sorgo, Sorghum bicolor. ABSTRACT CHANGES IN MORFOLOGY AND PHENOLICS ACCUMULATION IN SORGHUM (Sorghum bicolor (L.) Moench) PLANTS UNDER ALUMINUM STRESSThe Al +3 effects on the morphology and on the phenolics accumulation were evaluated in two sorghum cultivars exhibiting differential tolerance to Al +3 . The plants were kept in nutrient solution, for ten days, in the presence (185 mM) or Al +3 absence. The root apexes were colored with ferric hematoxylin, and because the intensity of color development is very similar among evaluated cultivars, the use of this method as a selection parameter for Al +3 -tolerance is not indicated. Analyses of superficial and internal morphology from tissues treated with Al +3 also expressed very similar alterations among the two cultivars, not allowing its use for selection between sensitive and Al +3 -tolerant genotype. The higher lignin accumulation and, mainly, the lower phenolics production in roots of the BR006R cultivar in Al +3 's presence, demonstrated the existence of differential tolerance among cultivars.

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Section: Resultsunclassified

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Alterações morfológicas e acúmulo de compostos fenólicos em plantas de sorgo sob estresse de alumínio

2007

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“…Calcium carbonate powder was added (0.3% (w/w)) to the soil and thoroughly mixed to further reduce availability of Zn and Mn. Soil was fertilized with solutions containing macro-and micronutrients at the following rates (in mg kg -I air-dry soil): 430 Ca(NO3)z.4H20,150 KH2PO4, 110 K2SO4, 70 MgSOa.7H20, 19 FeSOa.7H20, 14 H3BO3, and 5 CuSO4.5H20 (modified after Rengel et al, 1993).…”

Section: Methodsmentioning

confidence: 99%

Plant genotype, micronutrient fertilization and take-all infection influence bacterial populations in the rhizosphere of wheat

et al. 1996

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The relationship between micronutrient efficiency of four wheat (Triticum aestivum L.) genotypes, tolerance to take-all disease (caused by Gaeumannomyces graminis (Sacc.) Arx and Olivier vat. tritici Walker), and bacterial populations in the rhizosphere was tested in soil fertilized differentially with Zn and Mn. Plant growth was reduced by Mn or Zn deficiency and also by take-all. There was an inverse relationship between micronutrient efficiency of wheat genotypes when grown in deficient soils and the length of take-all lesions on roots (efficient genotypes had shorter lesions than inefficient ones). In comparison to the rhizosphere of control plants of genotypes Aroona and C8MM receiving sufficient Mn and Zn, the total numbers of bacterial cfu (colony forming units) were greater in the rhizosphere of Zn-efficient genotype Aroona under Zn deficiency and in Mn-efficient genotype C8MM under Mn deficiency. These effects were not observed in other genotypes. Take-all decreased the number of bacterial cfu in the rhizosphere of fully-fertilized plants but not of those subjected to either Mn or Zn deficiency. In contrast, the Zn deficiency treatment acted synergistically with take-all to increase the number of fluorescent pseudomonads in the rhizosphere, Although numbers of Mn-oxidising and Mn-reducing bacteria were generally low, take-all disease increased the number of Mn reducers in the rhizosphere of Mn-efficient genotypes Aroona and C8MM. Under Mn-deficiency conditions, the number of Mn reducers in the rhizosphere increased in Aroona but not in C8MM wheat. The results suggest that bacterial microflora may play a role in the expression of Mn and Zn efficiency and tolerance to take-all in some wheat genotypes.

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“…Arx and Olivier, could be depressed by ammonium and manganese fertilizers (Graham and Rovira, 1984 ;Christensen, Powelson and Brett, 1987 ;Wilhelm et al, 1990 ;Leggett, Sivasithamparam and McFarlane, 1991 ;Rengel et al, 1993). The edaphic factors which promote the disease are those which also render Mn unavailable to the host (Graham and Rovira 1984 ;Rengel, Pedler and Graham, 1994 and references therein).…”

Section: Discussionmentioning

confidence: 99%

“…Experiment A was a factorial experiment with three levels of Mn supply (5, 15 and 40 mg kg − " air-dry soil), three ratios of NH % -N:NO $ -N (100 : 0, 50 : 50 and 0 : 100 mg kg − " air-dry soil), two genotypes of barley (Mninefficient Galleon and Mn-efficient Weeah, see Huang et al, 1994), and four replications. Equal portions of top and subsoil horizons of highly calcareous, chronically Mndeficient soil from Wangary, Eyre Peninsula, South Australia (80 % CaCO $ , pH 8n5 ; see Graham, Davies and Ascher, 1985 ;Rengel, Graham and Pedler, 1993 ;Webb, Dinkelaker and Graham, 1993) were mixed and sieved through a 2-mm sieve. DTPA-extractable Mn (moist soil) before Mn fertilization was 0n1 mg kg − ".…”

Section: Methodsmentioning

confidence: 99%

Interactions Between Nitrogen and Manganese Nutrition of Barley Genotypes Differing in Manganese Efficiency

Tong

1997

Annals of Botany

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Ammonium-fed plants may acidify the rhizosphere and thus increase availability of Mn in calcareous alkaline soils. The importance of N nutrition in the differential expression of tolerance to Mn deficiency among cereal genotypes is not yet clear. Two factorial experiments testing effects of the NH % -N\NO $ -N ratio and Mn fertilization on growth of barley genotypes differing in tolerance to Mn deficiency were conducted in two calcareous alkaline soils in pots in a controlled environment. In the soil containing 80 % CaCO $ at pH 8n5, better root and shoot growth and higher shoot Mn concentrations were achieved with nitrate supply, especially at lower rates of Mn fertilization. The Mnefficient genotype Weeah (tolerant of Mn deficiency) achieved better root and shoot growth than Mn-inefficient Galleon barley (sensitive to Mn deficiency) regardless of experimental treatment. Fertilization with Mn did not influence total N concentration in barley roots and shoots. In the soil containing 5 % CaCO $ at pH 7n8, ammoniumfed plants had better root and shoot growth and, at shoot Mn concentrations above the critical level, Mn-inefficient Galleon performed better than Mn-efficient Weeah barley. It appears that differential expression of Mn efficiency among barley genotypes is not associated with differences in Mn availability expected to be produced by differential rhizosphere acidification as a response to different forms of N supply. There is an apparent preference of locally selected barley genotypes for nitrate nutrition when grown on the highly calcareous alkaline soils of southern Australia.# 1997 Annals of Botany Company

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Manganese nutrition and accumulation of phenolics and lignin as related to differential resistance of wheat genotypes to the take-all fungus

Cited by 39 publications

References 31 publications

Alterações morfológicas e acúmulo de compostos fenólicos em plantas de sorgo sob estresse de alumínio

Alterações morfológicas e acúmulo de compostos fenólicos em plantas de sorgo sob estresse de alumínio

Plant genotype, micronutrient fertilization and take-all infection influence bacterial populations in the rhizosphere of wheat

Interactions Between Nitrogen and Manganese Nutrition of Barley Genotypes Differing in Manganese Efficiency

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