Characterization of the Bipolaris maydis: symptoms and pathogenicity in popcorn genotypes (Zea mays L.)

Ferreira, C. M.; Saluci, Júlio César Gradice; Vivas, Marcelo; Santos, Juliana Saltires; Andrade, Monielly Soares; Vivas, Janieli Maganha Silva; Ramos, G. K. S.; Gravina, Geraldo de Amaral

doi:10.1590/1519-6984.256799

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…Previous studies found a similar coloration and pseudo‐septate conidia (Pal et al, 2015; Santos et al, 2016). Based on colour in the colony, in their study, Ferreira et al (2022) found the predominance of the colony texture being cotton wool, with grey‐ dark greenish in the front and black colour at the colony back, during B. maydis identification.…”

Section: Resultsmentioning

confidence: 94%

Rapid screening for resistance of maize inbred and hybrid lines against southern corn leaf blight

Shukuru,

Archana,

Kangela

2023

Journal of Phytopathology

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Bipolaris is one of the most important phytopathogenic fungal genera to cause disease in cereal crops. Southern corn leaf blight (SCLB) is a pandemic and widespread disease; it's found everywhere corn is grown, causing a noticeable reduction in crop yield. Most cultivated varieties of maize do not resist SCLB disease where it is reported. Nevertheless, previous researchers have reported some resistant varieties of maize. In this study, we tested inbred and hybrid lines collected from ICAR‐IIMR based in Ludhiana against the disease. The field experiment was setup using a Randomized Block Design with three replications in natural conditions. Here we evaluated lines by quantifying disease pressure, yield, and their attributes. Moreover, model‐based clustering allowed the identification of five groups. For the SCLB disease confirmation, infected maize leaves were collected and used for pathogen isolation, and a pure culture was maintained. Both disease assessment and data analysis focused more specifically on characters that showed significant differences between means, especially leaf area, percentage of leaf infection, disease incidence, disease severity, disease index by plot basis, number of grain rows formed per ear, weight of maize kernels per ear, each corn ear weight, shelling percentage, and grain yield. The two best clusters identified, namely Group 1 and Group 2, together comprise 11002, 11009, 11026, 11030, 11069, 11149, 11153, 11185, 11328, 11333, 11337, 11347, 11370, 11385, 11074, 11351, 11356, 11357, 11608, and Karav‐8523 lines. As per disease reaction, CM‐500 is individually one of the best lines in terms of SCLB resistance. Specific symptoms were clearly found on leaves, and pseudo‐septate conidia were observed under the microscope. Thus, several lines exhibited highly resistant reactions against SCLB, especially 11002, 11009, 11026, 11069, 11074, 11337, 11347, 11385, and CM‐500, and can still be recommended for farmers and in breeding programmes, for future usefulness as industries are complaining of maize shortages, and they present a great commercial potential.

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Section: Resultsmentioning

confidence: 94%

Rapid screening for resistance of maize inbred and hybrid lines against southern corn leaf blight

Shukuru,

Archana,

Kangela

2023

Journal of Phytopathology

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Resistance Assessment of Hybrid Corn Genotypes to Major Corn Diseases and Its Effects on Disease Epidemic Components in South Sulawesi, Indonesia

Mirsam,

Suriani,

Azrai

et al. 2023

BIO Web Conf.

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The use of resistant varieties is one of approach that can be used in the management of the pathogen development. This study aimed to examine the resistance level of hybrid corn genotypes to the corn major diseases and to determine its effect on the components of the disease epidemic. Testing for the three major diseases was carried out using spreader row plants as an inoculum source. Parameters observed in this study were disease incidence for downly mildew (DM), disease severity for maydis leaf blight (MLB) and leaf rust (LR), disease development model, infection rate, area under the disease progress curve (AUDPC), protection index, and path analysis. The results showed that the HBC01 genotype had the lowest attack intensity to DM, MLB, and LR, namely 35.55%, 37.33%, and 25.33%, respectively. The disease epidemic components also showed that the HCB01 genotype has the lowest AUDPC value and infection rate with the highest protection index against DM, MLB, and LR. Furthermore, relative humidity, temperature, rainfall, and wind velocity were correlated in influencing the development of DM, MLB, and LR. The conclusion is that the hybrid corn genotype greatly influences the development of epidemics of DM, MLB, and LR.

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Assessment of Biological and Chemical Exogenous Elicitors in Inducing Plant Systemic Resistance Against Southern Corn Leaf Blight Disease (Bipolaris maydis) and Its Role in Enhancing Corn Growth and Yield

Mirsam,

Kalqutny,

Suriani

et al. 2023

Preprint

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One of the alternative control efforts for Southern corn leaf blight (SCLB) disease is using biological agents and certain chemicals as elicitors to induce systemic resistance through increasing secondary metabolites. This study aims to evaluate several types of biological and chemical exogenous elicitors in inducing plant systemic resistance to SCLB disease caused by Bipolaris maydis and their effect on corn growth and yield. Testing was carried out under field conditions with planting spreader rows as inoculum source plants which were planted around the experimental block. This experiment was set up in a randomized block design consisting of eight elicitor treatments, one synthetic fungicide as a control (-), and sterile distilled water as control (+). AUDPC analysis based on disease severity showed that B. cereus strain J6, Chitin, and Chitosan could significantly suppress the SCLB disease progression in the field with the lowest AUDPC values, namely 1230, 1255, and 1255, respectively, and the highest protection index values of 30.31, 28.90, and 30.88%, respectively. Suppression of the SCLB disease progression was related to increasing plant resistance levels through increasing protein and phenolic content. Correlation analysis showed that B. cereus strain J6, Chitin, and Chitosan had a very strong positive correlation with the protection index value. Besides inducing plant resistance, elicitor treatments significantly affected maximum growth potential and plant height variables. Elicitor materials play a beneficial role in protecting corn occurrence by activating the induced systemic resistance system and inducing plant growth.

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Characterization of the Bipolaris maydis: symptoms and pathogenicity in popcorn genotypes (Zea mays L.)

Cited by 3 publications

References 18 publications

Rapid screening for resistance of maize inbred and hybrid lines against southern corn leaf blight

Rapid screening for resistance of maize inbred and hybrid lines against southern corn leaf blight

Resistance Assessment of Hybrid Corn Genotypes to Major Corn Diseases and Its Effects on Disease Epidemic Components in South Sulawesi, Indonesia

Assessment of Biological and Chemical Exogenous Elicitors in Inducing Plant Systemic Resistance Against Southern Corn Leaf Blight Disease (Bipolaris maydis) and Its Role in Enhancing Corn Growth and Yield

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