Reação de porta-enxertos híbridos ao Citrus tristeza virus

Filho, P. E. Meissner; Filho, Walter dos Santos Soares; Velame, K. V. C.; Diamantino, Elizio Pereira; Diamantino, Maria Selma Alves Silva

doi:10.1590/s0100-41582002000300014

Cited by 13 publications

(11 citation statements)

References 1 publication

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“…In Brazil, many farmers have ceased control of the vector in older groves, organic groves, and residential groves. The population levels of the aphid T. citricida, a vector of CTV, are usually higher than those of D. citri because of the use of rootstock resistant to CTV as well as varieties preimmunized with mild strains of CTV (Meissner Filho et al 2002). Both insects prefer leaves and green shoot branches (Gravena 2005), and the efficiency of D. citri and T. citricida control by the entomopathogenic fungi I. fumosorosea and B. bassiana in citrus groves may therefore be improved due to both intra-and interspecific horizontal transmission.…”

Section: Discussionmentioning

confidence: 99%

Transmission potential of the entomopathogenic fungi Isaria fumosorosea and Beauveria bassiana from sporulated cadavers of Diaphorina citri and Toxoptera citricida to uninfected D. citri adults

et al. 2016

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Diaphorina citri Kuwayama (Hemiptera: Liviidae) is the vector of the causal agent of Huanglongbing disease, and Toxoptera citricida Kirkaldy (Hemiptera: Aphididae) is the vector of the citrus tristeza virus. D. citri and T. citricida share the same habitat and both are susceptible to Beauveria bassiana and Isaria fumosorosea. Therefore, the aim of this study was to evaluate the horizontal transmission of B. bassiana ESALQ-PL63 and I. fumosorosea ESALQ-1296 between D. citri cadavers and uninfected D. citri adults, as well as between T. citricida cadavers and uninfected D. citri adults under laboratory and semifield conditions. In the laboratory, the presence of one to ten D. citri cadavers infected with B. bassiana and I. fumosorosea in citrus plants resulted in mortality rates of D. citri adults ranging from 51.2 to 81.9 % and 36.2 to 68 %, respectively. When T. citricida cadavers were used, the mortality rates of uninfected D. citri adults ranged from 35.4 to 87.7 % with B. bassiana and from 41.7 to 80.4 % with I. fumosorosea. The horizontal transmission was also confirmed under semi-field conditions. The results indicate that the control of D. citri using I. fumosorosea and B. bassiana can be promoted through conidial cycling in T. citricida, by generating new infection cycles, which may contribute to the overall performance of microbial control in citrus. Keywords Biological control Á Citrus pests Á Entomopathogen Á Horizontal transmission Á Diaphorina citri Á Toxoptera citricida

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Section: Discussionmentioning

confidence: 99%

Transmission potential of the entomopathogenic fungi Isaria fumosorosea and Beauveria bassiana from sporulated cadavers of Diaphorina citri and Toxoptera citricida to uninfected D. citri adults

et al. 2016

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“…(Aurantioideae, Rutaceae), commonly known as the trifoliate orange, is the closest relative of the genus Citrus, which is well-known for its cultivated fruits (Samuel et al 2001). This species has long attracted the attention of citrus breeders because of its importance as rootstock and the presence of a single dominant gene that confers resistance to citrus tristeza virus (Ctv), the main viral pathogen of citrus species (Gmitter et al 1996;Meissner Filho et al 2002).…”

Section: Introductionmentioning

confidence: 99%

The Cytogenetic Map of the Poncirus trifoliata (L.) Raf.—A Nomenclature System for Chromosomes of All Citric Species

Silva

Marques

Filho

et al. 2011

Tropical Plant Biol.

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A cytogenetic map was established for the trifoliate orange, Poncirus trifoliata. Chromosome size, centromere position and CMA + heterochromatin content were determined for each chromosome pair, together with the position of BAC clones previously described as chromosome-specific markers. Although P. trifoliata is a true biological species, heteromorphisms for the size of the heterochromatic bands in two chromosome pairs were observed. A minimum set of four BACs was proposed for chromosome identification in P. trifoliata, as well as a chromosome nomenclature that can be applied to all citrus species. The Ctv locus was assigned to chromosome 9 and the remaining linkage groups can now be integrated to this physical map. This standard nomenclature for trifoliate orange will be valuable for genome-sequencing projects in all citrus species.

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“…Regarding the parents from the crosses performed, 10 branches of three plants were collected. The branches were autoclaved for ten minutes to facilitate bark removal, according to Meissner Filho et al (2002).…”

Section: Methodsmentioning

confidence: 99%

“…Some authors have correlated the greater virulence of strains with stem pitting in branches and trunks. Thus, Salibe et al (1992) and Meissner Filho et al (2002) elaborated grade scales, using stem pitting intensity presented, for the selection of strains with less virulence and plants better adapted to certain regions. The scale elaborated by Meissner Filho et al (2002) has illustrations, making it more didactic.…”

Section: Introductionmentioning

confidence: 99%

Seleção a campo no Recôncavo Baiano de híbridos de limoeiros para resistência à tristeza

Diamantino

Filho

2017

Científica

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In Brazil, there is a low diversification of the citrus species used, which makes crops very vulnerable to diseases. As the Citrus tristeza virus (CTV) is endemic in Brazil, it is possible to select CTV-resistant hybrid varieties for its control. In this work, we evaluated the reaction of lemon trees and their hybrids to natural infection by CTV isolates in Cruz das Almas, in the Reconcavo Baiano region. Volkamerian lemon tree (VKLT), Cravo lemon tree (CLT), Palm orange tree (POT), Valencia orange tree (VOT), Sunki mandarin tree (SMT), Swingle citrumelo tree (SCT) and Trifoliate orange tree (TOT) were used as parents. VKLT x CLT, VKLT x POT, VKLT x VOT, SMT x (CLT x TOT) and CLT x SCT hybrids were produced. These were kept in the field, being evaluated as for stem pitting intensity when aged between four and seven years. The crosses that provided a higher percentage of CTV-resistant hybrids were CLT x SCT, VKLT x CLT and SMT x (CLT x TOT). On the other hand, the crosses between VKLT and POT, VKLT and VOT showed a higher percentage of susceptible hybrids. In this work, CTVresistant lemon hybrids were generated. The information will allow to direct new crosses of lemon, aiming to obtain hybrids with a higher level of tristeza resistance.

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Reação de porta-enxertos híbridos ao Citrus tristeza virus

Cited by 13 publications

References 1 publication

Transmission potential of the entomopathogenic fungi Isaria fumosorosea and Beauveria bassiana from sporulated cadavers of Diaphorina citri and Toxoptera citricida to uninfected D. citri adults

Transmission potential of the entomopathogenic fungi Isaria fumosorosea and Beauveria bassiana from sporulated cadavers of Diaphorina citri and Toxoptera citricida to uninfected D. citri adults

The Cytogenetic Map of the Poncirus trifoliata (L.) Raf.—A Nomenclature System for Chromosomes of All Citric Species

Seleção a campo no Recôncavo Baiano de híbridos de limoeiros para resistência à tristeza

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