Diseases of eucalypts in the central and northern provinces of Mozambique

Maússe-Sitoe, Sílvia Nd; Chen, Shuai Fei; Wingfield, Michael J.; Roux, Jolanda

doi:10.2989/20702620.2015.1126780

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…The data evaluated for E. grandis in Mocuba District, Mozambique, showed a great growth potential of the species in the region. Maússe-Sitoe et al (2016) emphasize the excellent initial species growth in the central and north regions of the country. When comparing Where: β 0 and β 1 = estimated regression coefficients, and β 0 and β 1 are fixed parameters indicating the intercept of the model; a1 and a2 = are fixed parameters, for dominant height (h 100 ) and basal area (G) respectively; RMSE = standard error of estimation; AIC = Akaike Information Criterion; BIC = Bayesian Information Criterion; p<0.0001 = probability significance p value (α = 5%).…”

Section: Discussionmentioning

confidence: 94%

“…We give emphasis to Eucalyptus grandis Hill ex. Maiden, which has been largely cultivated by the forest industry and small rural owners throughout the country, associated to the good performance of plantings, easy adaptation to the environment, quick growth in different sites and good timber quality (Willan, 1981;Chitará, 2003;Shimizu, 2006;MINAG, 2009;Maússe-Sitoe et al, 2016;Guedes et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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HEIGHT-DIAMETER RELATIONSHIPS FOR Eucalyptus grandis HILL EX. MAIDEN IN MOZAMBIQUE: USING MIXED-EFFECTS MODELING APPROACH

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Costa

Finger

et al. 2020

CERNE

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HIGHLIGHTS Height-diameter model using mixed-effects was developed for Eucalyptus grandis in Mozambique. Four dominant trees and one tree randomly selected in plot were sufficient to calibrate the model. The perspective is to increase accuracy, practicality, precision of height estimations and decrease of sampling effort in forest inventories in Mozambique ABSTRACT Equations express that height-diameter relationships are used to estimate tree heights that were not measured in the plots, as well as to calculate their volumes. In this study, we modelled height for Eucalyptus grandis Hill ex. Maiden stands using nonlinear mixed effect models in Mocuba District, Central Mozambique. Models were tested from 1414 trees measured, in 40 plots with dimensions of 20 x 20 m. Model one (M1) was the best in relation to the others according to the evaluated criteria (R 2 = 0.9183; RMSE = 0.558; AIC =-1234.8; BIC =-1224.9). The inclusion of the variables dominant height (h 100 , m), basal area (G, m 2. ha-1) and mean basal area diameter (dg, m) in model 1 (M1) within the scope of mixed effect model structures that involved both fixed and random effect parameters (Model 7) provides better fitting and more precise predictions. For calibration of random effects according to plot, height measurement of at least five trees is required (four dominant trees + one tree randomly selected in plot). Our model is site-specific and its application should therefore be limited to the stands with characteristics that were the basis of this study. Further works on recalibration, validation, and verification of our model using a larger dataset collected from a wider range of species distribution will be more interesting.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

HEIGHT-DIAMETER RELATIONSHIPS FOR Eucalyptus grandis HILL EX. MAIDEN IN MOZAMBIQUE: USING MIXED-EFFECTS MODELING APPROACH

Hofiço

Costa

Finger

et al. 2020

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“…Phylogenetic trees were viewed using MEGAx. Outgroups and comparative sequences were selected according to published literature [27,35,36].…”

Section: Sequence Analysis and Isolate Identificationmentioning

confidence: 99%

Diseases of Eucalypts in Paraguay and First Report of Teratosphaeria zuluensis from South America

Silva

Roux

Asiegbu

2020

Forests

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Background and objectives: The global forest economy is threatened by eucalypt pathogens which are often latent or cryptic species that escape common quarantine and detection methods. Plantation forestry using eucalypts is of considerable importance to Paraguay, but knowledge regarding the pests and diseases affecting these plantations is limited. This study identified fungal diseases present in these plantations. Materials and Methods: We surveyed eucalypt plantations in four provinces in Paraguay and collected material from diseased trees for identification of the causal agents. The samples were analyzed using a combination of morphological and molecular methods. Results: Diseases encountered included Botryosphaeria stem canker, Calonectria leaf blight, Chrysoporthe stem canker, myrtle/eucalypt rust, Coniella leaf spot, heartwood rot and Teratosphaeria stem canker. Contrary to expectations, the causal agent of Teratosphaeria stem canker was identified as Teratosphaeria zuluensis (M.J. Wingf., Crous & T.A. Cout.) M.J. Wingf. & Crous and not Teratosphaeria gauchensis (M.-N. Cortinas, Crous & M.J. Wingf.) M.J. Wingf. & Crous, that is commonly documented for the South American region. Conclusions: This study updates the knowledge on forest fungal pathogens in Paraguayan eucalypt plantations and is the first report of T. zuluensis in Paraguay and in South America.

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“…Some important pests on Eucalyptus are the insect pest, Leptocybe invasa, which causes galls in young leaves, and Gonipterus scutellatus (bronze bug), which causes damage to leaves through feeding (Wingfield et al, 2008). The pathogens which are considered major challenges to Eucalyptus species include Austropuccinia psidii, Teratosphaeria destructans, Teratosphaeria zuluense, Ceratocystis fimbriata, Chrysoporthe austroafricana, and Phytophthora cinnamomi [reviewed in Wingfield et al (2008) and Maússe-Sitoe et al (2016); Wingfield MJ personal communication]. The female L. invasa wasp, causes the formation of galls when ovipositing on leaf and stem tissues, laying eggs in the upper epidermal layer of young Eucalyptus leaves (Mendel et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

eCALIBRATOR: A Comparative Tool to Identify Key Genes and Pathways for Eucalyptus Defense Against Biotic Stressors

et al. 2020

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Many pests and pathogens threaten Eucalyptus plantations. The study of defense responses in this economically important wood and fiber crop enables the discovery of novel pathways and genes, which may be adopted to improve resistance. Various functional genomics experiments have been conducted in Eucalyptus-biotic stress interactions following the availability of the Eucalyptus grandis genome, however, comparisons between these studies were limited largely due to a lack of comparative tools. To this end, we developed eCALIBRATOR http://ecalibrator.bi.up.ac.za, a tool for the comparison of Eucalyptus biotic stress interaction. The tool, which is not limited to Eucalyptus, allows the comparison of various datasets, provides a visual output in the form of Venn diagrams and clustering and extraction of lists for gene ontology enrichment analyses. We also demonstrate the usefulness of the tool in revealing pathways and key gene targets to further functionally characterize. We identified 708 differentially expressed E. grandis genes in common among responses to the insect pest Leptocybe invasa, oomycete pathogen Phytophthora cinnamomi and fungus Chrysoporthe austroafricana. Within this set of genes, one of the Gene Ontology terms enriched was "response to organonitrogen compound," with NITRATE TRANSPORTER 2.5 (NRT2.5) being a key gene, up-regulated under susceptible interactions and downregulated under resistant interactions. Although previous functional genetics studies in Arabidopsis thaliana support a role in nitrate acquisition and remobilization under longterm nitrate starvation, the importance of NRT2.5 in plant defense is unclear. The T-DNA mutants of AtNRT2.5 were more resistant to Pseudomonas syringae pv. tomato pv tomato DC3000 inoculation than the wild-type counterpart, supporting a direct role for NRT2.5 in plant defense. Future studies will focus on characterizing the Eucalyptus ortholog of NRT2.5.

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Diseases of eucalypts in the central and northern provinces of Mozambique

Cited by 6 publications

References 40 publications

HEIGHT-DIAMETER RELATIONSHIPS FOR Eucalyptus grandis HILL EX. MAIDEN IN MOZAMBIQUE: USING MIXED-EFFECTS MODELING APPROACH

HEIGHT-DIAMETER RELATIONSHIPS FOR Eucalyptus grandis HILL EX. MAIDEN IN MOZAMBIQUE: USING MIXED-EFFECTS MODELING APPROACH

Diseases of Eucalypts in Paraguay and First Report of Teratosphaeria zuluensis from South America

eCALIBRATOR: A Comparative Tool to Identify Key Genes and Pathways for Eucalyptus Defense Against Biotic Stressors

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