scholarly journals Reaction of Sour Passion Fruit Lineages and Hybrids to Bacterial Spot Caused by Xanthomonas axononopodis pv. passiflorae Under Protected Cultivation and Field Conditions

2021 ◽  
Vol 13 (9) ◽  
pp. 112
Author(s):  
Isadora Nogueira ◽  
Anne Pinheiro Costa ◽  
José Ricardo Peixoto ◽  
Michelle Souza Vilela
Keyword(s):  
Disease Severity ◽  
Passion Fruit ◽  
Field Conditions ◽  
Bacterial Spot ◽  
Spot Disease ◽  
Protected Cultivation ◽  
Severity Scores ◽  
Bacterial Spot Disease ◽  
Grading Scale ◽  
Sour Passion Fruit

Passion fruit is infected by many plant pathogens, including Xanthomonas axonopodis pv. passiflorae, causing bacterial spot disease. This disease has been impaired orchards all over Brazil, resulting in low yield and production. In addition, it results in premature death of plants in the field. This study aimed to analyze the reaction of sour passion fruit genotypes to bacterial spot in leaves under protected cultivation (Experiment 1) and the bacterial spot severity in fruits under field conditions (Experiment 2). Experiment 1 was carried out as a randomized block design (RBD) with subdivided plots, composed of 24 treatments (genotypes), three replications, five plants per plot, and five evaluation dates. Bacterial spot incidence and severity were evaluated using a 0 to 5 grading scale. Evaluations were carried out at a 7-day interval after disease symptoms first appeared. Genotypes differed for mean disease severity and incidence. The bacterial spot disease evaluations showed that genotypes MAR20#46 P3 R4 X Rosa Claro R4 and MD 16 P3 X MAR20#39 P1 R4 presented the lowest scores for the disease incidence in the leaves. S2L AP R1, MAR20#19 ROXO R4 X ECRAM P3 R3, and MD 16 P3 X MAR20#39 P1 R4 were the genotypes with the lowest disease severity scores. Experiment 2 consisted of a RBD with 24 treatments, three replications, and seven plants per plot. Severity assessments were monthly performed on five fruits per plot, totaling three evaluation dates. In this experiment, the percentage of total fruit area with necrotic lesions was measured using a 1 to 4 grading scale. Bacterial spot severity assessments in fruits identified interactions between genotypes and evaluation dates (p ≤ 0.05). The lineages S2L MAR 20#15 R4 and S2L MAR20#19 R2 showed the lowest mean severity scores of bacterial spot in fruit. The genotypes with the lowest mean scores were selected to continue the breeding program.

scholarly journals Screening of Sour Passion Fruit for Reaction to Bacterial Spot and Passion Fruit Woodiness Disease

2020 ◽  
Vol 12 (2) ◽  
pp. 130
Author(s):  
Anne Pinheiro Costa ◽  
Isadora Nogueira ◽  
José Ricardo Peixoto ◽  
Luiz Eduardo Bassay Blum
Keyword(s):  
Disease Incidence ◽  
Passion Fruit ◽  
Bacterial Disease ◽  
Bacterial Spot ◽  
Slow Increase ◽  
Resistant Varieties ◽  
Protected Cultivation ◽  
Severity Scores ◽  
Bacterial Spot Disease ◽  
Sour Passion Fruit

The development of resistant varieties is a promising strategy for bacterial spot disease (Xanthomonas axonopodis pv. passiflorae-Xap) and passion fruit woodiness disease (PWD; Cowpea aphid-borne mosaic virus-CABMV) control in sour passion fruit (Passiflora edulis Sims). This study aimed at evaluating the reaction of 12 sour passion fruit half-sib progenies to both mechanically inoculated Xap and CABMV, under protected cultivation. The bacterial spot and PWD severity degrees observed reveal the existence of variability within progenies. MAR20#2005 and BRS GA1 revealed the lowest bacterial disease severity scores while MAR20#41, MAR20#2005, and Rosa Intenso 1 showed the lowest PWD severity scores. MAR20#41 presented the lowest disease incidence in all evaluations, demonstrating a slow increase in the number of plants with symptoms over time. Also, MAR20#41 stood out as the progeny with the greatest number of plants presenting resistance to PWD at the end of the study. Among the progenies selected, MAR20#2005 was the most promising for presenting the lowest severity scores for both bacterial spot and PWD.

scholarly journals Assessment of resistance of hybrids and lineages of passion fruit to bacteriosis under protected cultivation

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Janlylle Ruama Yankovich Arrifano ◽  
José Ricardo Peixoto ◽  
Michelle Souza Vilela ◽  
Solange da Costa Nogueira ◽  
Thiago Campos De Oliveira ◽  
...  
Keyword(s):  
Genetic Resistance ◽  
Passion Fruit ◽  
Bacterial Spot ◽  
Xanthomonas Axonopodis ◽  
Affected Area ◽  
Injured Area ◽  
Protected Cultivation ◽  
Diagrammatic Scale ◽  
Yellow Passion Fruit ◽  
Sour Passion Fruit

Yield and longevity of yellow passion fruit have been reduced by diseases such as the bacterial spot caused by Xanthomonas axonopodis pv. passiflorae. Genetic resistance has been confirmed as the most efficient and economical correct option to minimize this disease problem. Aiming at it, the objective of this research was to evaluate the incidence, severity and progression of the disease in 12 genotypes of sour passion fruit, in seedling stage in nursery greenhouse after inoculation of Xanthomonas axonopodis pv. passiflorae. The inoculation was performed with an isolate collected in the Pipiripau Rural Nucleus, Brasilia-DF, named UnB-1397 (1x106 CFU/mL), through induction of injuries. There were performed four assessments, with interval of 7 days except the first which was performed 11 days after inoculation. The incidence was estimated by the percentage of plants affected. To evaluate the severity, it was used the diagrammatic scale validated by Costa et al. (2018), with adaptations, using the measurement of the affected area by necrotic lesions on the leaf. All genotypes were susceptible to bacteriosis, 5 being considered moderately susceptible: F1 BRS Pérola do Cerrado x Rosa Intenso, Mar20#21, Mar20#15b, Mar20#24xMar20#40 and FB200PL4R2 x Mar20#2005, with a mean of severity ranging from 11 to 25% of injured area in leaves.  

scholarly journals Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

2019 ◽  
Vol 11 (9) ◽  
pp. 30 ◽  
Author(s):  
Anne Pinheiro Costa ◽  
José Ricardo Peixoto ◽  
Luiz Eduardo Bassay Blum ◽  
Alexandre Bosco de Oliveira ◽  
Ana Paula Gomes de Castro ◽  
...  
Keyword(s):  
Linear Regression ◽  
Correlation Coefficient ◽  
Disease Severity ◽  
Linear Regression Analysis ◽  
Passion Fruit ◽  
Concordance Correlation Coefficient ◽  
Concordance Correlation ◽  
Bacterial Spot ◽  
Accuracy And Precision ◽  
Sour Passion Fruit

This study developed and validated a standard area diagram set (SADs) to aid in the estimation of bacterial spot (Xanthomonas axonopodis pv. passiflorae) severity in entire-margined leaves of sour passion fruit (Passiflora edulis Sims). The SADs consisted of eight severity levels (3; 6; 12; 25; 50; 77, and 88%). For its validation, 20 raters, who initially estimated the disease severity without the aid of the SADs, were divided into groups (G1 and G3, inexperienced; G2 and G4, experienced). Subsequently, G1 and G2 performed the second evaluation without the SADs, and G3 and G4 completed the second evaluation using the proposed SADs. The accuracy and precision of the assessments were determined by simple linear regression and by the Lin’s concordance correlation coefficient. The increase in accuracy was confirmed by the 80% constant error-free estimates (G3 and G4) and 100% (G3) and 80% (G4) systematic error-free estimates when the SADs was used. Precision increased with the increase in the coefficient of determination, the reduction in absolute errors, and the increase in the reproducibility of the estimates between pairs of raters. Inexperienced raters benefited the most from the use of the SADs. The increase in the accuracy and precision in the non-aided groups, when present, was less pronounced than those increments observed in the SADs-aided groups. The Lin’s concordance correlation coefficient confirmed the increased accuracy and precision detected by the linear regression analysis and indicated increased agreement between the estimated and actual values of disease severity in the SADs-aided groups.

Erratum to “Reclassification of the Xanthomonads Associated with Bacterial Spot Disease of Tomato and Pepper”

2006 ◽  
Vol 29 (1) ◽  
pp. 85-86 ◽  
Author(s):  
Jeffrey B. Jones ◽  
George H. Lacy ◽  
Hacene Bouzar ◽  
Robert E. Stall ◽  
Norman W. Schaad
Keyword(s):  
Bacterial Spot ◽  
Spot Disease ◽  
Bacterial Spot Disease

PopW activates PAMP-triggered immunity in controlling tomato bacterial spot disease

2015 ◽  
Vol 463 (4) ◽  
pp. 746-750 ◽  
Author(s):  
Tian Wei ◽  
Luyao Wang ◽  
Xiaosi Zhou ◽  
Xiuyan Ren ◽  
Xiangqun Dai ◽  
...  
Keyword(s):  
Bacterial Spot ◽  
Spot Disease ◽  
Bacterial Spot Disease

Reclassification of the Xanthomonads Associated with Bacterial Spot Disease of Tomato and Pepper

2004 ◽  
Vol 27 (6) ◽  
pp. 755-762 ◽  
Author(s):  
Jeffrey B. Jones ◽  
George H. Lacy ◽  
Hacene Bouzar ◽  
Robert E. Stall ◽  
Norman W. Schaad
Keyword(s):  
Bacterial Spot ◽  
Spot Disease ◽  
Bacterial Spot Disease
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