The role of manganese and nitrogen nutrition in the susceptibility of wheat plants to take-all in Western Australia

Brennan, Ross

doi:10.1007/bf01064225

Cited by 57 publications

(36 citation statements)

References 20 publications

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“…The interactions between nutrients and the take-all fungus are very complex, but it generally appears that plants grown on inadequate supply of nutrients develop deficiency first and then become more susceptible to take-all; alleviating deficiency then increases resistance to the fungal infection (Graham and Webb, 1991). Supplying micronutrients in amounts far greater than those needed for optimum plant growth either does not cause further reduction in infection of wheat roots (Brennan, 1991;1992a) or deleteriously affects growth of the fungus itself (Marschner et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

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

1993

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Differential resistance of four Triticum aestivum L. genotypes to isolates of take-all fungus (Gaeumannomyces graminis var. tritici Walker) was tested in a complete factorial experiment set up in a growth chamber using Mn-deficient Wangary sand amended with four rates of Mn. Mn-efficient cultivars produced more dry matter at low supply of Mn. Fertilization with Mn significantly increased its accumulation in roots and shoots. The most sensitive measure of take-all infection was the total length of root stellar lesions; these lesions were reduced by Mn fertilization and were shorter in Mn-efficient genotypes. The resistance-enhancing effect of Mn was the most obvious in the Mn-inefficient genotype (Bayonet) and the least obvious in the Mn-efficient one (C8MM). Phenolics biosynthesis in roots was elicited by fungal infection, especially in the case of the highly virulent isolate. The weakly virulent isolate increased phenolics concentration in roots much more if no Mn was added, indicating that the resistance-enhancing effect of Mn may not be directly exerted through the effects on phenolics biosynthesis. Lignin concentration in roots decreased due to Mn fertilization, while no effect of take-all infection was noted. It appears that biosynthesis of phenolics and lignin in wheat roots has a low Mn requirement which can be satisfied at environmental Mn concentrations below those necessary for optimum plant growth.

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Section: Introductionmentioning

confidence: 99%

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

1993

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“…Mn-deficient plants have reduced content of fructans and structural carbohydrates causing slack and soft leaves (Pearson and Rengel, 1997). Accordingly, Mn-deficient plants are susceptible to low temperatures and pathogen infections, the latter including the frequently observed take-all (Gaeumannomyces graminis) fungal disease (Brennan, 1992;Rengel et al, 1994).…”

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confidence: 99%

Differential Capacity for High-Affinity Manganese Uptake Contributes to Differences between Barley Genotypes in Tolerance to Low Manganese Availability

Pedas¹,

Hebbern²,

Schjøerring³

et al. 2005

Plant Physiology

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There is considerable variability among barley (Hordeum vulgare) genotypes in their ability to grow in soils containing a low level of plant available manganese (Mn). The physiological basis for the tolerance to low Mn availability is unknown. In this work, Mn 21 influx and compartmentation in roots of the Mn-efficient genotype Vanessa and the Mn-inefficient genotype Antonia were investigated. Two separate Mn transport systems, mediating high-affinity Mn 21 influx at concentrations up to 130 nM and lowaffinity Mn 21 influx at higher concentrations, were identified in both genotypes. The two genotypes differed only in high-affinity kinetics with the Mn-efficient genotype Vanessa having almost 4 times higher V max than the inefficient Antonia, but similar K m values. Online inductively coupled plasma-mass spectrometry measurements verified that the observed differences in highaffinity influx resulted in a higher Mn net uptake of Vanessa compared to Antonia. Further evidence for the importance of the differences in high-affinity uptake kinetics for Mn acquisition was obtained in a hydroponic system with mixed cultivation of the two genotypes at a continuously low Mn concentration (10-50 nM) similar to that occurring in soil solution. Under these conditions, Vanessa had a competitive advantage and contained 55% to 75% more Mn in the shoots than did Antonia. Subcellular compartmentation analysis of roots based on 54 Mn 21 efflux established that up to 93% and 83% of all Mn was present in the vacuole in Vanessa and Antonia, respectively. It is concluded that differential capacity for high-affinity Mn influx contributes to differences between barley genotypes in Mn efficiency.

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“…While most previous studies emphasised Mn nutrition (Brennan, 1992b;McCay-Buis et al, 1995;Rengel et al, 1993Rengel et al, , 1994aRengel et al, , 1994bWilhelm et al, 1988;1990), this study shows that, in the case of the C8MM wheat, takeall disease affects Zn-deficient plants more than those fertilized with Zn ( Figure 1). Earlier studies showed that Zn fertilization of the wheat crop growing in the field on soils with low plant-available Zn helps alleviate take-all damage (Brennan, 1992a).…”

Section: Discussionmentioning

confidence: 73%

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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The role of manganese and nitrogen nutrition in the susceptibility of wheat plants to take-all in Western Australia

Cited by 57 publications

References 20 publications

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

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

Differential Capacity for High-Affinity Manganese Uptake Contributes to Differences between Barley Genotypes in Tolerance to Low Manganese Availability

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

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