Characterization of the Chlorotic Lesion Response by Maize to<i>Cercospora zeae-maydis</i>

Freppon, J. T.; Lipps, P. E.; Pratt, Richard C.

doi:10.1094/pd-78-0945

Cited by 14 publications

(7 citation statements)

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“…Inbred Pa875, with a high level of resistance (Elwinger et al., 1990; Donahue et al., 1991), consistently produced an irregular brown chlorotic or fleck response as described by Freppon et al. (1994).…”

Section: Resultsmentioning

confidence: 95%

“…The responses range from reduced rates of disease development to high levels of resistance to the pathogen (Ayers et al., 1984; Coates and White, 1998). These differences may be recognized qualitatively as distinctly different lesion types (LT) associated with certain inbreds (Freppon et al., 1994) or quantitatively by few lesions or slow rates of lesion expansion (Ward et al., 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Under field conditions, C. zeae‐maydis inoculum is commonly applied to maize plants (V8–V12 growth stage) by several artificial inoculation procedures, including deposition of ground, infested leaves (Thorson and Martinson, 1993), placing or planting into ‘no‐till’ plots with infested maize residue on the soil surface (de Nazareno et al., 1993; Asea et al., 2002), placing colonized sorghum or oat seeds into the whorl (Freppon et al., 1994; Ringer and Grybauskas, 1995) or by spraying conidial suspensions (Coates and White, 1998). Unfortunately, the coalescence of lesions with those of other common foliar diseases such as northern corn leaf blight (NCLB; causal agent, Exserohilum turcicum ) and Stewart's bacterial wilt ( Erwinia stewartii ) on adult plants in the field frequently interferes with disease assessments and analysis of certain components of resistance.…”

Section: Introductionmentioning

confidence: 99%

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Development of Greenhouse Inoculation Procedures for Evaluation of Partial Resistance to Cercospora zeae‐maydis in Maize Inbreds

Asea¹,

Lipps²,

Pratt³

et al. 2005

Journal of Phytopathology

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Greenhouse experiments were conducted to determine the effects of inoculation methods on incubation period, lesion length, percentage leaf area affected and sporulation of Cercospora zeae-maydis on young maize (Zea mays L.) plants inoculated at V3 growth stage. Seedling plants were inoculated by four methods: (i) application of conidial suspension while puncturing the leaves within the whorl several times, (ii) spraying conidial suspension on leaves, (iii) placing colonized agar into lateral slits in leaves and (iv) placing colonized agar into whorls. Analysis of variance revealed a significant effect of genotype and inoculation method on several components of resistance and overall disease severity. Application of conidial suspension while puncturing the whorl was found to be the least laborious method, and it produced characteristic symptoms of gray leaf spot. Consistent trends were observed in classification of inbreds to resistant, susceptible and intermediate classes. Increasing the duration of exposure to high humidity by placing plastic bags over plants for 5 days significantly increased disease severity (P £ 0.001). Cercospora zeae-maydis produced conidia in all the lesions examined. Spore production was generally most abundant in lesions on susceptible inbreds that displayed necrotic lesion types (LT) and least abundant in lesions on resistant inbreds that were characterized by chlorotic and fleck LTs. The results demonstrated that inoculations in the greenhouse can provide an indication of inbred responses to C. zeaemaydis and may be useful in evaluating resistance and in studies of host-pathogen interactions.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Greenhouse Inoculation Procedures for Evaluation of Partial Resistance to Cercospora zeae‐maydis in Maize Inbreds

Asea¹,

Lipps²,

Pratt³

et al. 2005

Journal of Phytopathology

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“…The epidemiology of grey leaf spot is governed by weather (Beckman & Payne, 1982;Rupe et al, 1982), cultivar susceptibility (Freppon et al, 1994) and inoculum density (de Nazareno et al, 1993a). The decline in the AUDPC with distance from the residue foci emphasises the role of residue infested with C. zeae-maydis in initiating epidemics of grey leaf spot when conditions are favourable.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cercospora zeae‐maydis infested maize residue on progress and spread of grey leaf spot of maize in central Uganda

Asea

Bigirwa²,

Adipala

et al. 2002

Annals of Applied Biology

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The spread of grey leaf spot caused by Cercospora zeae-maydis from infested maize residue on the soil surface and progress over time were studied under tropical conditions at two locations in central Uganda, Kabanyolo and Namulonge, using a susceptible local cultivar, LP16. Infested maize residue collected the previous season was used as the inoculum source in varying amounts; 80% coverage, 40% coverage and 0% soil coverage were used to simulate no tillage, minimum tillage and maximum tillage with complete burial of residues. In all the seasons, disease spread was adequately described by a power law model, whereas disease progress over time was equally well represented by both Gompertz and logistic models. The time factor was highly significant (P < 0.05) for disease development, indicating both increases in disease intensity over time and change in gradients with time. The amount of infested residue on the soil surface in the maize planting was highly significant (P < 0.05) for slope (b) and intercept (a) of the linearised disease gradient. The gradient parameter (b) based on the average for the four directions from the residue source ranged from -0.96 to -0.08 in the second cropping season of 1999, from -2.16 to -0.01 and from -0.87 to -0.03 in the first and second seasons of 2000, respectively. The distance from the infested residue significantly affected foliar disease, but the direction from the residue inoculum source did not, nor was the distance by direction interaction significant. However, interactions between amount of residue and distance were significant. Percentage leaf area affected by grey leaf spot, the areas under disease progress curves and disease intercepts decreased with distance at both locations, but rate of disease increase (r) was generally constant with distance from residue source at Kabanyolo, but not at Namulonge. The relationship between disease severity and amount of residue cover appeared to be affected by the level of background inoculum. At Kabanyolo, where little background inoculum was present, differences were detected in disease severity parameters between the no-residue plots and residue plots, whereas at Namulonge, where high background levels existed, there was no effect of residue on disease.

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“…As manchas, neste caso, podem ser menores e menos retangulares, geralmente acompanhadas por bordos cloróticos ou avermelhados (Freppon et al, 1994). A esporulação neste tipo de lesão é diminuta, o que contribui para uma menor intensidade da epidemia.…”

Section: Importância Da Mancha De Cercospora E Sintomatologiaunclassified

Cercospora zeae-maydis: esporulação, diversidade morfo-genética e reação de linhagens de milho.

Brunelli¹

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Characterization of the Chlorotic Lesion Response by Maize toCercospora zeae-maydis

Cited by 14 publications

References 0 publications

Development of Greenhouse Inoculation Procedures for Evaluation of Partial Resistance to Cercospora zeae‐maydis in Maize Inbreds

Development of Greenhouse Inoculation Procedures for Evaluation of Partial Resistance to Cercospora zeae‐maydis in Maize Inbreds

Effect of Cercospora zeae‐maydis infested maize residue on progress and spread of grey leaf spot of maize in central Uganda

Cercospora zeae-maydis: esporulação, diversidade morfo-genética e reação de linhagens de milho.

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