Informações inadequadas sobre resistência a doenças em catálogos de cultivares de hortaliças: um exemplo para tomate e pimentão

Lopes, C. A.; Ávila, A. C. de

doi:10.1590/s0102-05362002000200002

Cited by 3 publications

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“…O PepYMV é considerado como um dos vírus predominantes nas culturas da pimenta e do pimentão no Brasil (Lopes & Ávila, 2003;Lima et al, 2010). No presente trabalho, PepYMV foi o mais detectado em plantas dos diversos acessos de cumari, reafirmando a importância desse patógeno para a cultura.…”

Section: Resultsunclassified

Caracterização morfoagronômica preliminar de acessos de pimentas cumari

et al. 2016

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RESUMOA pimenta cumari, Capsicum baccatum var. praetermissum e C. baccatum var. baccatum, é uma espécie semidomesticada, endêmica das regiões Sudeste e Centro-Oeste do país. Apesar da sua importância econômica, principalmente para a agricultura familiar, e da sua ampla variabilidade, ainda não existe uma cultivar dessa espécie disponível no mercado brasileiro. Este trabalho teve como objetivo avaliar acessos de pimenta cumari do Banco de Germoplasma de Capsicum da Embrapa Hortaliças com base em características morfoagronômicas e identificar acessos promissores que possam dar origem a um programa de melhoramento genético. Verificou-se a existência de grande variabilidade entre os acessos analisados, tendo sido encontradas diferenças para a maioria das variáveis. O material mais precoce, CNPH 4065, floresceu aos 81 dias após a semeadura e o mais tardio, CNPH 2957, aos 126 dias. O número de flores por axila variou de 1 a 3. Já em relação à pilosidade, a quantidade de plantas muito pilosas foi de 6,25%; pilosidade moderada 6,25%; pouca pilosidade 12,50% e sem pilosidade 75,00%. A estimativa da produtividade variou de 8 a 340 gramas por planta e a incidência de viroses indicou o PepYMV como o mais frequente, tendo sido encontrado em 33% das plantas analisadas. Os acessos CNPH 4065, CNPH 3824, CNPH 3993, CNPH 2964 e CNPH 2948 foram considerados promissores para o uso em programa de melhoramento. Palavras-chave:Capsicum baccatum, precocidade, variabilidade. ABSTRACT Preliminary morpho-agronomic characterization of cumari hot peppersThe cumari hot pepper, Capsicum baccatum var. praetermissum and C. baccatum var. baccatum, is a semi-domesticated species, endemic to the Southeast and Midwest regions of Brazil. Despite its economic importance, especially for small farmers in family agriculture systems, no cumari cultivars are available in the Brazilian market. This research aimed to evaluate 16 cumari accessions of the Capsicum Germplasm Bank of Embrapa Vegetables based on morpho-agronomic features, and identify promising accessions for further breeding programs. Genetic variability was found among accessions and differences were observed for the majority of the characteristics. The earliest genotype, CNPH 4065, set flowers 81 days after sowing and the latest, CNPH 2957, at 126 days. The number of flowers per axil ranged from 1 to 3. Pubescence, a relevant plant characteristic associated to insect resistance was found as follows: highly pubescent plants 6.25%; moderately pubescent 6.25%; almost glabrous 12.50%; and glabrous 75.00%. Yield was estimated in between 8 grams/plant and 340 grams/plant. PepYMV (33% of the total number of plants) was the most prevalent virus infecting cumari hot peppers in the field. Five accessions (CNPH 4065; CNPH 3824; CNPH 3993; CNPH 2964; CNPH 2948) were considered as promising to be used in cumari breeding programs.

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Section: Resultsunclassified

Caracterização morfoagronômica preliminar de acessos de pimentas cumari

et al. 2016

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“…Plants affected by root‐knot nematodes (RKN) exhibit symptoms that suggest water and nutrient deficiency, abnormal development, yellowing of the leaves and withering. These symptoms are due to galls formation (thickenings) and rotting of the roots, which lose their normal capacity for absorbing water and nutrients (Lopes & Ávila, 2003; Soares et al, 2018). Among the management measures adopted for RKN in Capsicum are the use of resistant rootstocks, crop rotation, planting good quality seedlings, among others (Ferraz & Brown, 2016).…”

Section: Introductionmentioning

confidence: 99%

Biochemical response of resistant and susceptible Capsicum spp. to Meloidogyne enterolobii

Marques

Jesus

Oliveira

et al. 2023

Journal of Phytopathology

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One of the most important events for the success of parasitism is the nematode recognition of chemical signals exuded by the host plant. In response to the establishment of interactions, plants have evolved improved defence mechanisms. The present study aimed to identify resistance mechanisms by comparing the biochemical defence response of two chilli pepper (Capsicum spp.) genotypes (Bode roxa A‐resistant and Cambuci‐susceptible) to Meloidogyne enterolobii. The activity of β‐1,3‐glucanase (GLU), peroxidase, chitinase (CHI), phenylalanine ammonia‐lyase and lipoxygenase (LOX) was evaluated in the leaves and the roots at 7, 14, 21, 28 and 35 days after inoculation. There was an increase of GLU and CHI in leaves, and LOX in leaves and roots activities, of the resistant genotype (Bode roxa A). These results allow a better understanding of the defence mechanisms involved in the resistance of Capsicum spp. to M. enterolobii, which is an important step in developing management strategies for this pathosystem.

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“…The tomato can be considered one of the main fruits produced and consumed in Brazil, and tomatoes are grown in several regions of the country, especially the south, southeast and mid-west ( Camargo and Camargo Filho, 2008 ). There are several factors that decrease tomato production, including diseases caused by fungi, bacteria, and viruses ( Lopes and Avila, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

“…A disease known as bacterial spot, caused by Xanthomonas euvesicatoria , X. vesicatoria , X. perforans, and X. gardneri ( Jones et al , 2004 ), attacks tomatoes in Brazil ( Quezado-Duval et al , 2005 ; Pereira et al , 2011 ). Field management of the disease is difficult due to high temperatures and intense rainfall, and preventive measures are adopted for the management of bacterial spot, especially crop rotation, the use of healthy seeds and seedlings, balanced fertilization, and spraying of chemical products ( Lopes and Avila, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Chemical products induce resistance to <italic>Xanthomonas perforans</italic> in tomato

Itako¹,

Júnior²,

Júnior³

et al. 2015

Braz. J. Microbiol.

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The bacterial spot of tomato, caused by Xanthomonas spp., is a very important disease, especially in the hot and humid periods of the year. The chemical control of the disease has not been very effective for a number of reasons. This study aimed to evaluate, under greenhouse conditions, the efficacy of leaf-spraying chemicals (acibenzolar-S-methyl (ASM) (0.025 g.L−1), fluazinam (0.25 g.L−1), pyraclostrobin (0.08 g.L−1), pyraclostrobin + methiran (0.02 g.L−1 + 2.2 g.L−1), copper oxychloride (1.50 g.L−1), mancozeb + copper oxychloride (0.88 g.L−1 + 0.60 g.L−1), and oxytetracycline (0.40 g.L−1)) on control of bacterial spot. Tomatoes Santa Clara and Gisele cultivars were pulverized 3 days before inoculation with Xanthomonas perforans. The production of enzymes associated with resistance induction (peroxidase, polyphenol oxidase, phenylalanine ammonia-lyase, β-1,3-glucanase, and protease) was quantified from leaf samples collected 24 hours before and 24 hours after chemical spraying and at 1, 2, 4, 6, and 8 days after bacterial inoculation. All products tested controlled bacterial spot, but only ASM, pyraclostrobin, and pyraclostrobin + metiram increased the production of peroxidase in the leaves of the two tomato cultivars, and increased the production of polyphenol oxidase and β-1,3-glucanase in the Santa Clara cultivar.

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Informações inadequadas sobre resistência a doenças em catálogos de cultivares de hortaliças: um exemplo para tomate e pimentão

Cited by 3 publications

References 0 publications

Caracterização morfoagronômica preliminar de acessos de pimentas cumari

Caracterização morfoagronômica preliminar de acessos de pimentas cumari

Biochemical response of resistant and susceptible Capsicum spp. to Meloidogyne enterolobii

Chemical products induce resistance to <italic>Xanthomonas perforans</italic> in tomato

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