Cowpea Root Rot Severity and Metabolic Changes in Relation to Manganese Application

Kalim, Shahina; Luthra, Y. P.; Gandhi, S. K.

doi:10.1046/j.1439-0434.2003.00686.x

Cited by 17 publications

(11 citation statements)

References 15 publications

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“…Cowpea plants grown in soil amended with zinc sulphate at the rate of 20 μ g/g of soil showed lower severity of rhizoctonia root rot caused by the fungus R. solani and Rhizoctonia bataticola compared with soil non‐amended with zinc sulphate (Kalim et al. ). Silva et al.…”

Section: Resultsmentioning

confidence: 99%

Effect of Zinc on the Development of Brown Spot in Rice

Moreira

Rodrigues

Duarte

2013

Journal of Phytopathology

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Brown spot, caused by the fungus Bipolaris oryzae, is one of the most destructive diseases of rice. This study investigated the effect of zinc rates on the development of brown spot in rice. Rice plants (cv. ‘Metica‐1′) were grown in hydroponic culture amended with Zn rates (applied as ZnSO4.7H2O) of 0, 0.5, 1, 2 and 4 μm and inoculated with B. oryzae. The foliar concentration of Zn was determined. Leaf samples were assessed for disease severity, and then, area under brown spot progress curve (AUBSPC) was calculated. The relationship between Zn concentrations on leaf tissues and the rates of this micronutrient was best described by a positive linear regression model, while the relationship between the Zn rates and the AUBSPC was best described with a positive quadratic regression model. The correlation between Zn concentrations on leaf tissues and AUBSPC was positive and significant (r = 0.68, P < 0.05). The results from this study showed that high foliar concentration of Zn was associated with increasing rice susceptibility to brown spot.

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Section: Resultsmentioning

confidence: 99%

Effect of Zinc on the Development of Brown Spot in Rice

Moreira

Rodrigues

Duarte

2013

Journal of Phytopathology

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“…1993). Rhizoctonia root rot of cowpea, caused by R. solani and Rhizoctonia bataticola , was reduced by 44% when the plants were grown in soil amended with zinc sulphate at the rate of 20 μg/g soil (Kalim et al. 2003).…”

Section: Discussionmentioning

confidence: 99%

Effect of Soil‐applied Zinc and Manganese on the Development of Rhizoctonia Aerial Blight of Soybean

Silva

Rodrigues

Baroni

2011

Journal of Phytopathology

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Ivanete vanete Tonole onole Silva ilva, Fabrıcio abrício Á vila vila Rodrigues odrigues and Julio ú lio Cezar ezar Parpaiola arpaiola Baroni aroni Abstract This study aimed to investigate the effect of soilapplied zinc (Zn) and manganese (Mn) rates on the development of aerial blight, caused by Rhizoctonia solani Ku¨hn, in soybean. Plants (cv. ÔConquistaÕ) were grown in a typical Acrustox red-yellow latosol amended with Zn rates (applied as ZnSO 4AE 7H 2 O; 24% Zn) of 0, 1, 2, 4, 8 and 16 mg⁄dm 3 of soil and Mn rates (applied as MnSO 4AE H 2 O; 36% Mn) of 0, 1.5, 3 and 6 mg⁄dm 3 of soil and inoculated with R. solani. The relationship between Zn and Mn concentrations on leaf tissues and the rates of these micronutrients was linear. The incubation period was not affected by Zn and Mn rates. The relationship between application rates and the area under aerial blight progress curve was best described with a positive linear regression model for Zn and with a positive quadratic regression model for Mn. Results from this study showed that high foliar concentrations of Zn and Mn do not increase soybean resistance to aerial blight.

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“…We have found no examples of increased resistance to leaf diseases mediated by Mn above the optimum level for plant growth in the literature. Pathogen-related effects of Mn were mainly associated with root diseases, e.g., Gaeumanomyces graminis in wheat (Wilhelm et al, 1990) and Rhizoctonia solani/ bataticola in cowpea (Kalim et al, 2003). These studies focused on raising the Mn level from deficiency to optimum supply.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, in prior experiments, Mn was invariably increased from deficient to optimal levels for plant growth. The promotion of plant health by Mn was, e.g., explained in terms of an activation of peroxidase and polyphenoloxidase enzymes which increased the phenol concentrations in the roots (Kalim et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effect of manganese on the resistance of tomato to Pseudocercospora fuligena

Heine

Max

Führs

et al. 2011

Z. Pflanzenernähr. Bodenk.

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Black leaf mold caused by Pseudocercospora fuligena is an important fungal disease of tomato in Southeast Asia. The objective of this study was to evaluate the control of this disease using high manganese (Mn) applied to the root substrate and to evaluate the role of the leaf apoplast in plant response to fungal infection. In a nethouse experiment in Thailand, Mn above the optimum for plant growth but below toxicity increased resistance of tomato plants to black leaf mold. Enhanced resistance caused by Mn was also obtained when tomato plants were grown under controlled conditions in a mist chamber and artificially inoculated with the fungus. Manganese significantly increased plant peroxidases in the leaf apoplast. The highest peroxidase activity was measured when plants were inoculated with Pseudocercospora fuligena. Defense-related proteins in the leaf apoplast increased when plants were inoculated with Pseudocercospora fuligena but not when treated with high Mn. It is concluded that Mn above the optimum level for plant growth can contribute to the control of Pseudocercospora fuligena in tomato. The Mn effect on disease resistance is associated with the activation of plant peroxidases in the leaf apoplast. A systemic response, possibly mediated by NADH peroxidase activity, also seems to trigger disease resistance in leaves with low Mn concentrations.

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Cowpea Root Rot Severity and Metabolic Changes in Relation to Manganese Application

Cited by 17 publications

References 15 publications

Effect of Zinc on the Development of Brown Spot in Rice

Effect of Zinc on the Development of Brown Spot in Rice

Effect of Soil‐applied Zinc and Manganese on the Development of Rhizoctonia Aerial Blight of Soybean

Effect of manganese on the resistance of tomato to Pseudocercospora fuligena

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