Surto epidemiológico do vírus do mosaico amarelo do pimentão em tomateiro na região serrana do Espírito Santo

ABSTRACT. We investigated inheritance of resistance to Pepper yellow mosaic virus (PepYMV) in Capsicum baccatum var. pendulum accessions UENF 1616 (susceptible) crossed with UENF 1732 (resistant). Plants from generations P 1 , P 2 , F 1 , F 2 , BC 1:1 , and BC 1:2 were inoculated and the symptoms were evaluated for 25 days. Subsequently, an area under the disease progress curve was calculated and subjected to generation means analysis. Only the average and epistatic effects were significant. The broad and narrow sense heritability estimates were 35.52 and 21.79%, respectively. The estimate of the minimum number of genes that control resistance was 7, indicating that resistance is polygenic and complex. Thus, methods to produce segregant populations that advocate selection in more advanced generations would be the most appropriate to produce chili pepper cultivars resistant to PepYMV.

Section: Introductionmentioning

confidence: 99%

Inheritance of resistance to Pepper yellow mosaic virus in Capsicum baccatum var. pendulum

Bento¹,

Rodrigues²,

Gonçalves³

et al. 2013

“…Yellow mosaic, which is caused by the potyvirus Pepper yellow mosaic virus (PepYMV), is considered one of the most important diseases for solanaceous crops, such as chili pepper, sweet pepper, and tomato in Brazil (Maciel-Zambolim et al, 2004;Nascimento et al, 2007;Bento et al, 2009). The symptoms caused by PepYMV in Capsicum spp include curling leaves, development of yellowish-green mosaic, general reduction in the size of plants and fruits, and fruit deformation (Carmo et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Peroxidase is involved in Pepper yellow mosaic virus resistance in Capsicum baccatum var. pendulum

Gonçalves

Rodrigues²,

Diz³

et al. 2013

ABSTRACT. Pathogenesis-related proteins (PRs) are among the defense mechanisms of plants that work as an important barrier to the development of pathogens. These proteins are classified into 17 families according to their amino acid sequences, serology, and/or biological or enzyme activity. The present study aimed to identify PRs associated with the pathosystem of Capsicum baccatum var. pendulum: Pepper yellow mosaic virus (PepYMV). Forty-five-day-old plants from accession UENF 1624, previously identified as resistant to PepYMV, were inoculated with the virus. Control and infected leaves were collected for analysis after 24, 48, 72, and 96 h. The inoculated and control plants were grown in cages covered with anti-aphid screens. Proteins were extracted from leaf tissue and the presence of β-1,3-glucanase, chitinase, peroxidase, and lipid transport protein was verified.

“…The main symptoms are leaf twisting, mosaic development, dwarfism, and fruit deformity (Maciel-Zambolim et al, 2004;Bento et al, 2013). Seven genic loci have already been identified in pvr series imparting resistance to the Potyvirus genus in Capsicum plants.…”

Section: Introductionmentioning

confidence: 99%

Research Article Multiple genetic resistances in Capsicum spp.

Bento¹,

Souza²,

Sudré³

et al. 2017

ABSTRACT. This study aimed to identify Capsicum genotypes with resistance to bacterial spot (BS), anthracnose and Pepper yellow mosaic virus (PepYMV). Fifty-four genotypes of Capsicum spp were evaluated. Resistance reaction against BS was evaluated using three replicates, testing hypersensitivity and quantitative resistance in leaves. After evaluation, inoculated leaves were detached from the plants, being then cultivated until reproductive stage for evaluations anthracnose resistance in immature and mature fruit, totalizing 18 fruits per genotype. For PepYMV resistance was performed with five replications. Each genotype reaction was evaluated by a scoring scale, using the area under the disease progress curve for each pathosystem, and incubation period for the three systems. The latent period was evaluated only for the pathosystem Capsicum-Colletotrichum gloeosporioides. Means were grouped by the Scott-Knott test. Measures of dissimilarity matrix among the genotypes were obtained by Gower's algorithm and the grouping was obtained by the UPGMA clustering method. The accessions belonging to the Capsicum frutescens were the most susceptible to the three diseases. At least one genotype of Capsicum baccatum var. pendulum, Capsicum annuum, and Capsicum chinense showed resistance potential to BS and PepYMV, for use in breeding programs. The accession UENF 1381 (C. annuum) was resistant to the three pathogens.