Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Oliva, Jonàs; Romeralo, Carmen; Stenlid, Jan

doi:10.1016/j.foreco.2011.06.033

Cited by 20 publications

(17 citation statements)

References 31 publications

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“…The exact mechanism of formation of the reaction zone is not yet understood (Hietala et al, 2009) but its higher density than the sapwood (Oliva et al, 2011) supports the idea of an allocation of carbon from other parts of the sapwood. Although not all decay could be ascribed to Heterobasidion, we would not expect that pathogen-specific patterns would affect our observations, since reaction zone is considered to be an un-specific response.…”

Section: Discussionmentioning

confidence: 81%

Understanding the role of sapwood loss and reaction zone formation on radial growth of Norway spruce (Picea abies) trees decayed by Heterobasidion annosum s.l.

Oliva

Camarero

Stenlid

2012

Forest Ecology and Management

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Section: Discussionmentioning

confidence: 81%

Understanding the role of sapwood loss and reaction zone formation on radial growth of Norway spruce (Picea abies) trees decayed by Heterobasidion annosum s.l.

Oliva

Camarero

Stenlid

2012

Forest Ecology and Management

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“…the area in the living wood with an active defense against the pathogen) as well as in the decay zone. In particular, K + was detected at the highest amount in the decay area (4844 mg kg −1 ), followed by Ca 2+ (1952 mg kg −1 ), Mg 2+ (491 mg kg −1 ) and finally Na + (20 mg kg −1 ) [29]. These data indicate that H. annosum encounters a high saline environment during its colonization process which suggests that it may have developed intracellular responses to be able to adapt in those unfavourable conditions.…”

Section: Discussionmentioning

confidence: 99%

Role of the HaHOG1 MAP Kinase in Response of the Conifer Root and But Rot Pathogen (Heterobasidion annosum) to Osmotic and Oxidative Stress

2012

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The basidiomycete Heterobasidion annosum (Fr.) Bref. s.l. is a filamentous white rot fungus, considered to be the most economically important pathogen of conifer trees. Despite the severity of the tree infection, very little is known about the molecular and biochemical aspects related to adaptation to abiotic stresses. In this study, the osmotic and oxidative tolerance as well as the role of the HaHOG1 Mitogen Activated Protein Kinase (MAPK) gene were investigated. The transcript levels of the yeast orthologues GPD1, HSP78, STL1, GRE2 and the ATPase pumps ENA1, PMR1, PMC1 known to have an important role in osmotolerance were also quantified under salt osmotic conditions. The HaHOG1 gene was used for a heterologous expression and functional study in the Saccharomyces cerevisiae Δhog1 strain. Moreover, the phosphorylation level of HaHog1p was studied under salt osmotic and oxidative stress. The result showed that H. annosum displayed a decreased growth when exposed to an increased concentration of osmotic and oxidative stressors. GPD1, HSP78, STL1 and GRE2 showed an induction already at 10 min after exposure to salt stress. Among the ATPase pumps studied, PMC1 was highly induced when the fungus was exposed to 0.2 M CaCl2 for 60 min. The heterologous expression of the HaHOG1 sequence in yeast confirmed that the gene is able to restore the osmotolerance and oxidative tolerance in the S. cerevisiae hog1Δ mutant strain. The HaHog1p was strongly phosphorylated in the presence of NaCl, KCl, H2O2 but not in the presence of CaCl2 and MgCl2. The GFP-HaHog1p fusion protein accumulated in the nuclei of the S. cerevisiae hog1Δ cells when exposed to high osmotic conditions but not under oxidative stress. These results provide the first insights about the response of H. annosum to osmotic and oxidative stress and elucidate the role of the HaHOG1 gene in such conditions.

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“…Studies (Houston, 1971) have shown that with the discoloration and decay of standing trees, the content of metal ions such as potassium, calcium, manganese, and magnesium in the rotten wood increase. As the concentration of cations increased, the electrical resistance of decayed and discolored wood was significantly reduced compared to healthy wood (Ostrofsky, Jellison & Smith, 1997;Nilsson, Karltun & Rothpfeffer, 2002;Jonàs, Carmen & Jan, 2011). The severity of decay detected by ERT (D e ) mainly reflects the increase of the moisture content and metal ions in the decayed trees (Bieker & Rust, 2010).…”

Section: Analysis Of the Relationship Between D E And D Tmentioning

confidence: 99%

Peer Review #3 of "Electric resistance tomography and stress wave tomography for decay detection in trees—a comparison study (v0.1)"

2019

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Background. To ensure the safety of trees, two NDT (nondestructive testing) techniques, electric resistance tomography and stress wave tomography, were employed to quantitatively detect and characterize the internal decay of standing trees.Comparisons between those two techniques were done to make full use of the individual capability for decay detection. Methods. Eighty trees (40 Manchurian ash and 40 Populus simonii) were detected, then wood increment cores were obtained from each cross disc trial. The D t , which was defined as the value determined by the mass loss ratio of each wood core, was regarded as the true severity of decay. Using ordinary least-squares regression to analyze the relationship between D t and D e (D e was defined as the severity of decay determined by electric resistance tomography) and between D t and D s (D s was defined as the severity of decay determined by stress wave tomography). Results. The results showed that both methods could estimate the severity of decay in trees. In terms of different stages of decay, when D t <30%, D e had a strong positive correlation with D t (R 2 =0.677, P<0.01), while, when D t ≥30%, D s had a significant positive correlation relationship with D t (R 2 =0.645, P<0.01). Conclusion. Electric resistance tomography was better than stress wave tomography for testing in the early stages of decay, while stress wave tomography can be used effectively in the late stage of decay. It is suggested that each technique can be used in the practice of internal decay testing of standing trees based on decay stages and operating conditions.

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Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Cited by 20 publications

References 31 publications

Understanding the role of sapwood loss and reaction zone formation on radial growth of Norway spruce (Picea abies) trees decayed by Heterobasidion annosum s.l.

Understanding the role of sapwood loss and reaction zone formation on radial growth of Norway spruce (Picea abies) trees decayed by Heterobasidion annosum s.l.

Role of the HaHOG1 MAP Kinase in Response of the Conifer Root and But Rot Pathogen (Heterobasidion annosum) to Osmotic and Oxidative Stress

Peer Review #3 of "Electric resistance tomography and stress wave tomography for decay detection in trees—a comparison study (v0.1)"

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