Resistência de linhagens de alface-crespa às raças de Bremia lactucae identificadas no Estado de São Paulo

Tobar-Tosse, Dora Enith; Candido, Willame dos Santos; Marín, Manuel; Panizi, Rita de Cássia; Barbosa, José Carlos; Braz, Leila Trevisan

doi:10.1590/0100-5405/2152

Cited by 6 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These two strategies should be combined whenever possible to reduce the selection pressure exerted on the pathogen (Barriere et al, 2015). Tobar-Tosse et al (2017) proposed a latency index to quantify the severity of the disease, but arbitrated notes according to the day when the plant showed the first signs of the pathogen so that those who presented the signs of the pathogen earlier received higher scores. Already in the present work, we tried to arbitrate notes according to the total leaf area of the seedling that was occupied by sporangiophores and to demonstrate them through photographic images (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

Diagrammatic scale for evaluation of Bremia lactucae sporulation in lettuce seedlings

2023

View full text Add to dashboard Cite

In disease assessment, the use of diagrammatic scales provides a standard reference point for comparison. There is still no precise and accurate scale for the evaluation of sporulation intensity of downy mildew in lettuce seedlings.The objective of this study was to propose a diagrammatic scale for the evaluation of downy mildew severity in lettuce seedlings. Thirty lettuce seedlings with different sporulation intensities were used to develop the proposed diagrammatic scale. Solaris lettuce cultivar was sown, and fifteen days after sowing, inoculations occurred using distilled water, the pathogen sporangia, and Tween 20. The monitoring of disease development was performed daily.When the first sporulation appeared on the cotyledonaryleaves,the proposed scale was verified to meet the minimum and maximum levels of disease severity. Two evaluators verified the accuracy, precision and performed the estimation of the sporulation and reproducibility using a scale. The images obtained are important in the standardization of a scale to identify resistant, tolerant and susceptible plants to downy mildew. Furthermore, it allows validating a diagrammatic scale of sporulation intensity of B. lactucae in lettuce seedlings. Thus, it is the diagrammatic scale developed in the work will guide future research to accelerate the detection of mildew severity in lettuce seedlings.

show abstract

Section: Resultsmentioning

confidence: 99%

Diagrammatic scale for evaluation of Bremia lactucae sporulation in lettuce seedlings

2023

View full text Add to dashboard Cite

show abstract

“…These crisphead lettuce lines have the resistance factors R18 and R38 to the downy mildew races (Bremia lactucae) SPBl:01, SPBl:02, SPBl:03, SPBl:04, SPBl:05, SPBl:06, SPBl:07, SPBl: 09, SPBl:10 SPBl:11, and SPBl:12 that arose in the State of São Paulo (Castoldi et al 2014;Tobar-Tosse et al, 2017). They are characterized by light-green leaves of high frizziness, large plant size, absence of lateral shoots, tolerance to early flowering, and tipburn in the summer season.…”

Section: Plant Genetic Materialsmentioning

confidence: 99%

Identifying crisphead lettuce genotypes for a wider range of environments

Tobar-Tosse

Candido²,

Santos

et al. 2021

CTA

View full text Add to dashboard Cite

This work aims to select crisphead lettuce (Lactuca sativa L) genotypes superior in production, stability, and adaptability using a mixed model method: restricted maximum likelihood/best linear unbiased prediction. Ten genotypes were grown in different municipalities of the State of São Paulo, Brazil, and seasons of the year, resulting in twelve different environments. The experiment has a randomized complete block design with four repetitions. Genotypes comprise eight breeding lines and two commercial cultivars, Vanda and Vera. The evaluated traits include total production in g/plant, commercial production in g/plant, and numbers of leaves/plant. Analysis of joint deviance indicated that the genotypes responded differently to the environments evaluated. The crisphead lettuce breeding lines that were most productive, stable, and adapted to the twelve lettuce-growing environments, even outperforming the commercial Vanda and Vera cultivars, were lines L8, L2, and L6.

show abstract

“…The disease management of lettuce downy mildew is mainly done through fungicide application and use of resistant cultivars, carrying Dm genes or resistance factors R, which express hypersensitivity reaction (Castoldi et al, 2014 andTobar-Tosse et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Potential Effect of the Infection by Downy Mildew (Bremia Lactucae) in Lettuce Plants (Lactuca Sativa,L) on the Experimental Rats التأثير المحتمل للإصابة بالبياض الزغبي (Bremia Lactucae) Downy Mildew لنباتات الخس (Lactuca Sativa, L) علي فئران التجارب

Mostafa El- Sayed,

Nazeih Ahmed Abd- El-Rahman,

Fathi Muhammad Al- Sahiti

2022

المجلة العلمية لعلوم التربية النوعية

View full text Add to dashboard Cite

This study aimed to find out the possible effect of downy mildew infection of lettuce plants in powder form on experimental rats. Thirty adult white male rats , each weighing (110-140 ) g , were used and divided into 5 equal groups (sex rats in each group). The first group is the negative control group. As for the other groups, healthy and infected lettuce leaves were added, used at a rate of 5% and 10% each of the main meal in crushed form. At the end of the experiment, they were anesthetized and blood samples were collected and body weight gain , feed intake, Feed Efficiency Ratio, liver functions (GPT -GOT -ALP), kidney functions (urea -creatinine -uric acid), total protein, (albumin -globulin), blood lipid level (total cholesteroltriglycerides), lipoproteins (HDL-c -LDL-c -VLDL-c) and complete blood count (hemoglobin -hematocrit -platelets -RBCs -WBCs) were evaluated. Histopathological examination of the liver and kidney was also performed. The obtained results concluded that feeding on lettuce leaves led to a significant increase in (hemoglobin, hematocrit, platelets and red blood cells) and a decrease in (albumin, uric acid, urea, creatinine, white blood cells and liver and kidney weight) compared to the negative control group. Also feeding on 5% of infected lettuce leaves gave the highest value in

show abstract

Resistência de linhagens de alface-crespa às raças de Bremia lactucae identificadas no Estado de São Paulo

Cited by 6 publications

References 13 publications

Diagrammatic scale for evaluation of Bremia lactucae sporulation in lettuce seedlings

Diagrammatic scale for evaluation of Bremia lactucae sporulation in lettuce seedlings

Identifying crisphead lettuce genotypes for a wider range of environments

Contact Info

Product

Resources

About