Biplot Analysis of Host-by-Pathogen Data

Yan, Weikai; Falk, D. E.

doi:10.1094/pdis.2002.86.12.1396

Cited by 60 publications

(85 citation statements)

References 9 publications

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“…As farmers do not use fungicides on barley in Morocco, the use of resistant cultivars is, therefore the most, cost effective and environmentally friendly disease management strategy. In the past, the variation in virulence of P. teres populations were investigated using sets of differential genotypes (Khan 1982;Bockelman et al 1983;Robinson and Jalli 1996;Yan and Falk 2002;Afanasenko et al 2009), but there is a lack of a universal differential set for the net blotch disease. The aim of this study is to characterize the responses of 16 barley genotypes (International Differential set for Ptt including Moroccan genotypes) to 15 Moroccan isolates of Ptt in order to determine the virulence spectrum of this pathogen in Morocco.…”

Section: Introductionmentioning

confidence: 99%

Virulence of MoroccanPyrenophora teresf.teresRevealed by International Differential Barley Genotypes

Taibi

Bentata

Rehman³

et al. 2016

Cereal Research Communications

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Pyrenophora teres f. teres (Ptt), causing net blotch in barley, is an important and frequently isolated leaf pathogen across the globe. The virulence spectrum of Ptt from North Africa including Morocco is poorly understood. Sixteen barley genotypes were challenged, at seedling stage, with 15 Ptt isolates that were collected from different agroecological zones of Morocco. The experiment was conducted in a factorial arrangement of treatments in a randomized complete block design with three replicates. The ANOVA revealed highly significant (P < 0.001) effects of genotype (G), isolate (I) and G×I interaction explaining 23.2, 62.5, and 13.9% of the variation, respectively. Therefore, the current study revealed highly diverse virulence pattern of Moroccan isolates. Furthermore, the results indicated that minor virulence of Ptt isolates dominated over virulence interaction. In addition, Taffa (6-rowed) and Aglou (2 rowed), had the highest level of resistance to Ptt, while Coast and Rabat071 were the most susceptible genotypes. Pt2, Pt7, Pt8 and Pt4 were being the most virulent isolates, while Pt10 and Pt11 were the least virulent isolates. The emergence of the new Ptt pathotypes, which were highly virulent to durable resistance in Rabat071 posed a risk of breaking down the currently deployed resistance to net blotch in Morocco. A careful evaluation and selection of Ptt isolates based on minor virulence pattern to barley genotypes is essential for successful barley breeding program for resistance to net blotch in Morocco.

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Section: Introductionmentioning

confidence: 99%

Virulence of MoroccanPyrenophora teresf.teresRevealed by International Differential Barley Genotypes

Taibi

Bentata

Rehman³

et al. 2016

Cereal Research Communications

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“…The identification of isolates with high aggressiveness allowed a better discrimination of the host in relation to the level of resistance, as reported by Silva et al (2014), and they are useful in routine selection activities. The isolates I4 and I8 were less aggressive and had less importance in discriminating common bean genotypes and they are not recommended for screening of lines for white mold resistance FALK, 2002). The results for aggressiveness of the isolates using GGE were also similar (Figure 3).…”

Section: Resultsmentioning

confidence: 82%

Reaction of common bean lines derived from recurrent selection for white mold resistance and aggressiveness of Sclerotinia sclerotirum isolates

Leite¹,

Figueiredo²,

Dias³

et al. 2017

Biosci. J.

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ABSTRACT:The objectives of this study were to verify the resistance of common bean lines derived from recurrent selection for white mold resistance and to identify those more stable to different isolates; to compare the aggressiveness of different Sclerotinia sclerotiorum isolates; and to verify isolates x lines interaction. Fifteen common bean lines were evaluated, twelve derived from recurrent selection for white mold resistance, one non-adapted source of resistance (Cornell 605), one moderately resistant and adapted (VC-16) and one susceptible to white mold (Corujinha). Ten isolates were used to inoculate the common bean lines through the straw test. A total of ten experiments were performed, one for each isolate. The randomized complete block design with three replications was used in each experiment. Each plot had five plants inoculated in two main branches, therefore the plot data was the average of the ten evaluations through a scale of nine grades. Diallel analysis were used to estimate the general reaction capacity (lines) and general aggressiveness capacity (isolates) to measure the resistance to white mold and the aggressiveness of the isolates, respectively. The GGE biplot analysis was used to group the common bean lines based on their resistance alleles and identify those more instable to the isolates. The resistance of the lines P4 and P10 was similar to Cornell 605, and they had stable reaction to different isolates and "Carioca" grain type. The lines of the advanced cycles of recurrent selection accumulated more favorable alleles than those of the first cycles, confirming the efficiency of the recurrent selection to increase white mold resistance in common bean. In addition, it was identified more aggressive isolates, UFLA 109 and UFLA 116, and a small magnitude of isolates x lines interaction, indicating a predominance of the horizontal resistance of the lines.

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“…Genotypes situated at the vertices of the polygon contributed mostly to the interaction, i.e. those with the highest (right side) or lowest (left side) % II (Yan & Falk, 2002). The lines traced perpendicularly to each side of the polygon form location groups of similar behavior called mega-environments (ME).…”

Section: Discussionmentioning

confidence: 99%

“…These techniques include joint regression (JR), additive main effects and multiplicative interaction (AMMI) analyses, and site regression model (SREG) (Rea, Sousa-Vieira, Díaz, Ramón, Briceño, George, … & Balzano-Nogueira, 2016;Yan & Falk, 2002 (Gitonga, Ojwang, Macharia, & Njau, 2016) and Orobanche spp. in Vicia faba (Rubiales, Flores, Emeran, Kharrat, Amri, RojasMolina & Sillero, 2014).…”

Section: Introductionmentioning

confidence: 99%

Genotype by environment interactions for damage caused by Diatraea spp. borers in sugarcane

et al. 2018

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Genotype by environment interactions for damage caused by AbstractDiatraea spp. (Lepidoptera: Crambidae) or sugarcane stem borers are important sugarcane pests in Venezuela. The use of resistant cultivars is part of an integrated management to control these insects in many countries. The aim of this study was to evaluate a group of sugarcane genotypes for Diatraea damage in several environments, and to assess the interaction among damage caused by Diatraea and yield components. Data were collected from five sugarcane field trials located in plots belonging to the Venezuelan Sugarcane Breeding Program. Twenty genotypes were evaluated for Diatraea damage in a completely randomized block design with three replicates. AMMI and GGE biplot analyses were executed for infestation intensity (II). Genotypes that showed best stability, good yield and low damage from Diatraea spp. across environments were V99-236, V00-50 and V99-190. Cultivar CP74-2005 was the most affected by injuries of sugarcane stem borers throughout locations. Intensity of infestation (II) and index of damage (ID) were highly associated. Furthermore, high intensity of infestation (II) and index of damage (ID) caused by Diatraea disturbed the Pol % cane of the genotypes.Keywords: Genetic phenomena; control methods; AMMI; GGE biplot; stable resistance; mega-environments. ResumenLos taladradores de la caña de azúcar Diatraea spp. (Lepidoptera: Crambidae) son importantes plagas de la caña de azúcar en Venezuela. El uso de cultivares resistentes forma parte del manejo integrado para el control de esos insectos en muchos países. Los objetivos de este trabajo fueron evaluar un grupo de genotipos de caña de azúcar a los daños de Diatraea spp. en varios ambientes y determinar la interacción entre los daños causados por el complejo de insectos del genero Diatraea y los componentes de rendimiento. Los datos fueron recolectados en cinco localidades evaluadas por el programa venezolano de mejoramiento de la caña de azúcar. Veinte genotipos fueron evaluados al daño de Diatraea spp. en cinco localidades en un diseño de bloques al azar con tres repeticiones. La tasa de intensidad de infestación (II) causada por Diatraea spp. fue analizada mediante los modelos AMMI y GGE biplot. Los genotipos más recomendados por su estabilidad, buen rendimiento y menor daño por taladradores del tallo a través de los ambientes fueron: V99-236, V00-50 y V99-190. El cultivar CP74-2005 fue el más afectado por el daño de Diatraea spp. a través de las localidades. La intensidad de la infestación (II) y el índice de daño (ID) estuvieron altamente asociados. Altas tasas de intensidad de infestación (II) e índice de daño (ID) causado por Diatraea afectaron el Pol % caña de los genotipos. Palabras clave: Fenómeno

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Biplot Analysis of Host-by-Pathogen Data

Cited by 60 publications

References 9 publications

Virulence of MoroccanPyrenophora teresf.teresRevealed by International Differential Barley Genotypes

Virulence of MoroccanPyrenophora teresf.teresRevealed by International Differential Barley Genotypes

Reaction of common bean lines derived from recurrent selection for white mold resistance and aggressiveness of Sclerotinia sclerotirum isolates

Genotype by environment interactions for damage caused by Diatraea spp. borers in sugarcane

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