Resistance of Eucalyptus pellita to rust (Puccinia psidii)

Santos, Marisângela Rodrigues dos; Guimarães, Lúcio Mauro da Silva; Resende, Marcos Deon Vilela de; Rosse, Leonardo Novaes; Zamprogno, K. C.; Alfenas, Acelino C.

doi:10.1590/1984-70332014v14n4a38

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…At present, the selection of genotypes resistant to myrtle rust has been one of the main disease control measures (Alves et al., ). The genetic basis of resistance to A. psidii in eucalypts was shown to be complex through the combined action of major‐ and minor‐effect genes (Junghans et al., ; Mamani et al., ; Santos et al., ). A greater understanding of the genetic basis of resistance mechanisms to A. psidii infection across a range of New Caledonian host species showing response variability may provide interesting insights into the drivers of resistance.…”

Section: Discussionmentioning

confidence: 99%

Impact of Austropuccinia psidii in New Caledonia, a biodiversity hotspot

et al. 2017

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SummaryMyrtle rust, caused by the fungus Austropuccinia psidii, infects a wide range of host species within the Myrtaceae family worldwide. Since its first report in 2013 from New Caledonia, the extent of the host range, geographical distribution and genetic diversity of A. psidii in this territory have been unknown. This study reports 67 new host species distributed in 13 different Myrtaceae genera, including five new genera.The pathogen was found in various types of plant communities, where Myrtaceae species are the dominant or codominant species, as well as in several nurseries. It is now considered a significant threat to the biodiversity of ecosystems and the Myrtaceaerelated economy. A 3-year disease monitoring trial with 35 cultivated Myrtaceae species showed variations in disease severity at the species and individual scales. This suggests that some level of genetic resistance to myrtle rust may possibly exist among the endemic Myrtaceae of New Caledonia. A population genetic investigation revealed that only one single genotype of A. psidii occurs across its entire host range in New Caledonia. Therefore, it is essential to carry out population genetic surveillance to identify the appearance of mutations or the introduction of potentially more virulent genotypes of A. psidii. The outcomes from this study will assist with the ongoing management of the disease in New Caledonia.

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Section: Discussionmentioning

confidence: 99%

Impact of Austropuccinia psidii in New Caledonia, a biodiversity hotspot

et al. 2017

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“…However, we must consider including in crosses those individuals that may be disease/pest tolerant not only in groups with high-or intermediate-level growth, but also those in the least productive progenies. Therefore, it is important to identify E. pellita individuals with resistance to Puccinia psidii (rust), as previously reported in the literature (Santos et al, 2014), including in the Helenvale provenance (Roux et al, 2015). Resistance to other diseases, such as those caused by Ceratocystis fimbriata (ceratocystis wild) and Cylindrocladium pteridis (leaf spot and defoliation) (Guimarães et al, 2010), should also be considered in diallel designs along with individuals from fast-growing species such as E. grandis, to evaluate all possible crosses and identify the presence of heterosis of these crossings (Souza Junior, 2001).…”

Section: Figurementioning

confidence: 92%

THE USE OF GENETIC DISTANCE AND GROUPING METHODS TO PREDICT Eucalyptus Pellita F. MUELL GENITORS FOR HYBRIDIZATION

Andrade

Fernandes

Siqueira

et al. 2020

CERNE

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The use of genetic distance and grouping methods to predict Eucalyptus pellita F. Muell genitors for hybridization. CERNE, v. 26, n. 3, p.414-426, 2020. HIGHLIGHTSUPGMA and Tocher's grouping methods showed contrasting results.Tocher's method was more reliable according to the cophenetic correlation coefficient.Limited genetic distance was found between Eucalyptus pellita provenances.Heterotic groups can be validated through crossings between divergent parents.

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“…Some fungus species threaten Eucalyptus crops; Puccinia psidii Winter and Calonectria spp. commonly cause diseases in trees cultivated in tropical and subtropical climates (Varshney et al, 2012;Santos et al, 2014;Alfenas et al, 2015). The Suzano Pulp and Paper Company provided the phenotypic data of the clones studied in relation to their tolerance to these pathogens.…”

Section: Figmentioning

confidence: 99%

Phenolics metabolism provides a tool for screening drought tolerant Eucalyptus grandis hybrids

Dias¹,

Picoli²,

Souza³

et al. 2017

Aust J Crop Sci

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Eucalyptus L'Hér. (Myrtaceae) is one of the most economically important plant genera worldwide. Breeding programs aim to adjust productivity and tolerance to abiotic stresses such as water deficit. Plants under stress can overcome the excessive production of reactive oxygen species via the production of phenolics. Therefore, the aim of the present study is to investigate the variation of leaf phenolics content among 4 commercial clones of E. grandis hybrids subjected to simulated water deficit (moderate and severe treatment). Seedlings of E. grandis hybrids were exposed to adequate water supply (control) and two concentrations of polyethylene glycol solutions (moderate and severe stress) for 60 days. Then, leaves were harvested and their phenolic contents were measured by high-performance liquid chromatography and colorimetric assays. Each clone showed a different tolerance level and reacted in a specific manner against this stress. Principal component analysis of controls of each clone revealed that caffeic acid and quercitrin contents were found at very low levels in the sensitive and in the tolerant clone leaves, respectively. The tolerant (E. grandis × urophylla-EGU-EGU1) and EGU3 clones had higher phenolic contents in the stressed seedlings than in the control ones. In contrast, this variation was not detected in the sensitive clone leaves (E. grandis hybrid-EGR). Chemical analysis of these phenolics can be used as a reliable screening tool for drought tolerant hybrids in Eucalyptus. Our results also support the selection of more efficacious Eucalyptus hybrids for field cultivation, thereby enhancing its environmental competitiveness.

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Resistance of Eucalyptus pellita to rust (Puccinia psidii)

Abstract: -Eucalypts rust (Puccinia psidii) is currently one of the major diseases in commercial eucalypt plantations in

Cited by 14 publications

References 20 publications

Impact of Austropuccinia psidii in New Caledonia, a biodiversity hotspot

Impact of Austropuccinia psidii in New Caledonia, a biodiversity hotspot

THE USE OF GENETIC DISTANCE AND GROUPING METHODS TO PREDICT Eucalyptus Pellita F. MUELL GENITORS FOR HYBRIDIZATION

Phenolics metabolism provides a tool for screening drought tolerant Eucalyptus grandis hybrids

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