Efeito da tristeza em caracteres vegetativos, produtivos e industriais da laranjeira 'Valência' enxertada em híbridos segregando para tolerância

Bordignon, Rita; Filho, Herculano Penna Medina; Siqueira, Walter José; Pio, Rose Mary

doi:10.1590/s0006-87052003000200005

Cited by 7 publications

(9 citation statements)

References 4 publications

(3 reference statements)

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“…Similar results were obtained by Bordignon et al (2003b) evaluating the effect of CTV infection on vegetative growth, yield, and industrial variables of Valencia sweet orange trees. They observed that the yield was the most affected parameter, with 85% reduction in cumulative yield for five seasons.…”

supporting

confidence: 82%

“…The trunk diameter was measured at 10 cm below and above the grafting line. The vegetative tree vigor index was calculated by using the equation: V1 = [height (m) + average diameter of the canopy (m) + (diameter below the grafting line (cm)/100 × 10)] (Bordignon et al, 2003b). The canopy volume was calculated using the equation: V2 = ⅔·π·R 2 ·H (Mendel, 1956), in which V2 is the volume of the canopy (m 3 ); R is the average radius of the canopy (m); and H is the tree height (m).…”

Section: Evaluations Of the Yield And Tree Growthmentioning

confidence: 99%

“…Furthermore, CTV and its main vector, the brown citrus aphid (Toxoptera citricida Kirk.) are endemic in Brazil, thus sweet orange trees are most likely to be infected with this virus over their lifespan (Bordignon et al, 2003b).…”

Section: Introductionmentioning

confidence: 99%

“…The planting of Pera sweet orange trees that are cross-protected against CTV are key for the success of the Brazilian citrus industry, where more than 90 million crossprotected trees of Pera sweet orange have been planted (Moreno et al, 2008). However, CTV is a continuous threat due to the risk of introduction of new severe CTV strains or strain complexes (Folimonova, 2013); the endemic presence of T. citricida, which is the most efficient vector for CTV transmission (Bordignon et al, 2003b;Moreno et al, 2008); and the use of a single mild strain of the virus in the cross protection programs (Müller et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…They observed that the yield was the most affected parameter, with 85% reduction in cumulative yield for five seasons. In general, the production variables (i.e., fruit mass and yield) were the most affected, followed by vegetative variables (i.e., vegetative tree vigor, tree height, and trunk diameter), whereas the industrial variables were minimally affected (Bordignon et al, 2003b).…”

mentioning

confidence: 95%

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Agronomic performance of Pera and related sweet orange accessions naturally infected with Citrus tristeza virus in northern Paraná State, Brazil

Baba¹,

Giampani²,

Tazima³

et al. 2014

Trop. plant pathol.

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Despite of the susceptibility to the Citrus tristeza virus (CTV), Pera sweet orange is the most important citrus cultivar in Brazil. The objective of this study was to evaluate the CTV aggressiveness and the relationship with the agronomic performance of 24 accessions of Pera and related sweet oranges. Accessions belonging to the Citrus Germplasm Collection of the Instituto Agronômico do Paraná (IAPAR), Londrina, PR, were included in the study. Citrus tristeza disease was rated based on the severity of stem pitting symptoms. Yields were evaluated in the 2010/2011, 2011/2012, and 2012/2013 seasons, and tree growth in 2012. The best performance regarding stem pitting severity was shown by Redonda accession, followed by Ipiguá II. Vegetative tree vigor was more evident for Redonda, Tardia CO3, and Guilherme Spagnol accessions. These Pera and related sweet oranges accessions also showed the highest fruit yields, along with Vimusa, Santa Tereza, Ipiguá, Ipiguá II, D-6, and Paulo Rosa. Vegetative tree vigor, yield and number of fruits were inversely correlated with citrus tristeza disease stem pitting severity. Therefore, the poor agronomic performance of some Pera and related sweet oranges is probably related to the presence of severe CTV complexes infecting these accessions.

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supporting

confidence: 82%

Section: Evaluations Of the Yield And Tree Growthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 95%

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Agronomic performance of Pera and related sweet orange accessions naturally infected with Citrus tristeza virus in northern Paraná State, Brazil

Baba¹,

Giampani²,

Tazima³

et al. 2014

Trop. plant pathol.

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Citrus tristeza disease severity and agronomic performance of ‘Pêra’ sweet orange cultivars and selections in the North and Northwest regions of the State of Paraná, Brazil

et al. 2016

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‘Pêra’ sweet orange is the most important citrus cultivar in Brazil, but it is highly susceptible to Citrus tristeza virus (CTV), the causal agent of citrus tristeza disease. In this study, we evaluated the severity of citrus tristeza disease and its relation with the agronomic performance of seven cultivars and six selections of ‘Pêra’ sweet orange under field conditions in the North and Northwest regions of the State of Paraná, Brazil. The citrus tristeza disease severity was determined based on symptoms of stem pitting. The vegetative growth assessed in trees of all four locations for the 2012 season, and in two field plots for the 2011, 2012 and 2013 harvests, respectively. The cultivar ‘IPR 153’ (Bianchi) had the best performance concerning stem pitting severity, while Selection 27 was among the ones with the highest rate of vegetative growth. Further, Selections 27 and 12, and the cultivar ‘Vimusa’ had the largest fruit yields. Based on correlation analysis, stem pitting symptoms severity was negatively correlated with vegetative growth and fruit yield. Furthermore, environmental conditions may have played an important role in the severity of citrus tristeza disease and consequently on the agronomic performance of the cultivars and selections of ‘Pêra’ sweet orange in the North and Northwest regions of the State of Paraná.

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A tristeza dos citros e suas implicações no melhoramento genético de porta-enxertos

et al. 2003

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O Brasil é o maior produtor mundial de citros e, historicamente, a tristeza, a doença de maior importância econômica da cultura. Causada por um closterovirus (CTV) de RNA fita simples positiva, encontra-se disseminada por quase todas as regiões citrícolas do globo. Transmitida por enxertia e algumas espécies de pulgão, principalmente Toxoptera citricida, apresenta diversas estirpes, causando sintomas variados em Citrus e afins. Proteção cruzada de copas sensíveis através de estirpes fracas do vírus é uma eficiente técnica de controle desenvolvida no Brasil e utilizada em várias partes do mundo. Métodos de detecção e caracterização do vírus baseiam-se nos sintomas de variedades e clones específicos, mas, métodos sorológicos e moleculares são empregados também no monitoramento da expansão da doença. As plantas, não raro, são infectadas com mais de uma estirpe, que se podem recombinar geneticamente e são passíveis de transmissibilidade diferencial pelos vetores ou por diferentes borbulhas da mesma planta. A composição do complexo de estirpes presente na planta pode alterar-se após poda drástica, ou em resposta a condições ambientais. Tipos menores de RNA defectivos e subgenômicos ocorrem freqüentemente junto às partículas normais do CTV. Alguns defectivos estão associados aos sintomas de amarelecimento de plântulas. O controle da doença é feito pelo uso de variedades de copas e de porta-enxertos que interagem conforme a capacidade de multiplicar as partículas virais em suas células e de tolerar sua presença nos tecidos do floema. Essas características têm importantes implicações para o cultivo e melhoramento. A presente revisão discute também as reações de plantas enxertadas e de pé-franco, ressalta os problemas, conceitos básicos e as implicações relevantes para o melhoramento genético de porta-enxertos.

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Efeito da tristeza em caracteres vegetativos, produtivos e industriais da laranjeira 'Valência' enxertada em híbridos segregando para tolerância

Cited by 7 publications

References 4 publications

Agronomic performance of Pera and related sweet orange accessions naturally infected with Citrus tristeza virus in northern Paraná State, Brazil

Agronomic performance of Pera and related sweet orange accessions naturally infected with Citrus tristeza virus in northern Paraná State, Brazil

Citrus tristeza disease severity and agronomic performance of ‘Pêra’ sweet orange cultivars and selections in the North and Northwest regions of the State of Paraná, Brazil

A tristeza dos citros e suas implicações no melhoramento genético de porta-enxertos

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