Ecology and Epidemiology of Virus and Viroid Diseases of Tropical Crops

Sastry, K. Subramanya; Zitter, Thomas A.

doi:10.1007/978-94-007-7820-7_1

Cited by 5 publications

(2 citation statements)

References 515 publications

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“…The application of Gompertz model in describing the disease progress also supported by Berger (1981) who reported that Gompertz model was better fit to other statistical models in plant diseases including estimation of epidemic rate, projection of future disease severity and determination of initial disease. Besides that, the Gompertz model was able to linearize the asymmetrical disease progress curves which happened to many pathosystems known as polycyclic disease compared to the Logistic model (Berger, 1981;Sastry & Zitter, 2014). The exponential model was not selected in fitting the disease severity because the model was more appropriate to describe the very early stages of most polycyclic epidemics but not efficient in growth stage (Contreras-Medina et al, 2009).…”

Section: Disease Severity Curve Fitted Modelmentioning

confidence: 99%

Grouping Tolerant Level of Cocoa Genotypes Against Pod Rot Disease in Malaysia

Chang¹,

Salleh²,

Yazik³

et al. 2020

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Cocoa pod rot disease (CPRD), caused by Phytophthora palmivora, is the main disease that caused major losses in Malaysia. It is important for screening the cocoa genotypes available in Malaysia for their tolerance level against the CPRD. This paper has an objective to select the potential genotypes tolerant to P. palmivora by grouping the cocoa genotypes available in Malaysia based on four tolerant levels such as tolerant, moderately tolerant, moderately susceptible and susceptible. The experiment was carried out at the laboratory of Plant Pathology at the Cocoa Development and Research Centre Jengka, Pahang using the detachedpod test. Isolate of P. palmivora was obtained from a naturally infected cocoa pod in cocoa field at the Cocoa Research and Development Centre Tawau, Sabah,Malaysia then inoculated by a single point on the ridges of pod to 40 mature unripe pods of each tested genotypes. Fifty genotypes were tested in this study.The assessed disease severity was the rate of lesion area development from 1 to 7 days after inoculation and the proportion of pod area infected by CPRD. Thedisease severity was significantly different among tested genotypes showing tolerance variability against CPRD. Four nonlinear models consisted of Monomolecularmodel, Exponential model, Logistic model and Gompertz model were used to fit the proportion pod infection area curve. The best fitted Gompertz model was used in calculated the area under disease progress curve (AUDPC). The variability of both disease severity variables was used to group the genotypes into four tolerant levels using the k-means clustering method with 10 genotypes in group I (torelant), 14 genotypes in group II (moderately tolerant), 13 genotypes in group III (moderately susceptible) and 13 genotypes in group IV(susceptible). Six genotypes in group I, namely MCBC 13, PBC 221, BAL 209, KKM 19, QH 1176 and KKM 22 were identified to have lower disease severity values compared to control tolerant genotype PBC 123 that could be suggested to the farmers to be planted in the field.

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Section: Disease Severity Curve Fitted Modelmentioning

confidence: 99%

Grouping Tolerant Level of Cocoa Genotypes Against Pod Rot Disease in Malaysia

Chang¹,

Salleh²,

Yazik³

et al. 2020

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“…de Bary, which causes potato late blight (LB), and potato virus Y (PVY), a member of the genus Potyvirus, are two of the most important potato pathogens worldwide and, if not controlled, can damage entire plants and cause yield reductions of up to 80% [4][5][6]. The incidence of these two diseases has increased due to several factors, including climate variations, inadequate crop management, the strain and pressure of the pathogen, and the use of nonresistant varieties [7][8][9]. Resistance to late blight and PVY is controlled by several genes, and the development of molecular markers [10,11] has resulted in accelerated breeding cycles and a reduction in operational costs.…”

Section: Introductionmentioning

confidence: 99%

Kompetitive Allele Specific PCR (KASP) Markers for Potato: An Effective Tool for Increased Genetic Gains

et al. 2021

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Potato virus Y (PVY) and Phytophthora infestans (Mont.) de Bary that causes potato late blight (LB), pose serious constraints to cultivated potatoes due to significant yield reduction, and phenotyping for resistance remains challenging. Breeding operations for vegetatively propagated crops can lead to genotype mislabeling that, in turn, reduces genetic gains. Low-density and low-cost molecular marker assessment for phenotype prediction and quality control is a viable option for breeding programs. Here, we report on the development of kompetitive allele specific PCR (KASP) markers for LB and PVY resistance, and for routine quality control assessment of different breeding populations. Two KASP markers for LB resistance and two for PVY Ryadg were validated with an estimated assay power that ranged between 0.65 and 0.88. The developed QC KASP markers demonstrated the capability of discriminating tetraploid calls in breeding materials, including full-sibs and half-sibs. Routine implementation of the developed markers in a breeding program would assist with better allocation of resources and enable precise characterization of breeding material, thereby leading to increased genetic gains.

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Molecular analysis of a divergent isolate of Potato virus H from potato reveals novel evolutionary feature of Carlaviruses

Liu

Zhang

et al. 2019

Canadian Journal of Plant Pathology

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Ecology and Epidemiology of Virus and Viroid Diseases of Tropical Crops

Cited by 5 publications

References 515 publications

Grouping Tolerant Level of Cocoa Genotypes Against Pod Rot Disease in Malaysia

Grouping Tolerant Level of Cocoa Genotypes Against Pod Rot Disease in Malaysia

Kompetitive Allele Specific PCR (KASP) Markers for Potato: An Effective Tool for Increased Genetic Gains

Molecular analysis of a divergent isolate of Potato virus H from potato reveals novel evolutionary feature of Carlaviruses

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