Soil microbial community restructuring and functional changes in ancient kauri (Agathis australis) forests impacted by the invasive pathogen Phytophthora agathidicida

Byers, Alexa-Kate; Condron, Leo M.; O’Callaghan, Maureen; Waipara, Nick; Black, Amanda

doi:10.1016/j.soilbio.2020.108016

Cited by 18 publications

(23 citation statements)

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“…Lower fine root N, P, Ca, Mg, and Fe content have been found in European beech seedlings with P. citricola (Wang et al, 2003). Differences in microbial and fungal communities between asymptomatic and symptomatic mature kauri trees (Byers et al, 2020) and changes in microclimatic conditions (van der Westhuizen, 2014) are likely to affect nutrient cycling.…”

Section: Stemflowmentioning

confidence: 99%

Impact of Phytophthora agathidicida infection on canopy and forest floor plant nutrient concentrations and fluxes in a kauri‐dominated forest

Schwendenmann

Michalzik

2021

Ecology and Evolution

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Section: Stemflowmentioning

confidence: 99%

Impact of Phytophthora agathidicida infection on canopy and forest floor plant nutrient concentrations and fluxes in a kauri‐dominated forest

Schwendenmann

Michalzik

2021

Ecology and Evolution

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“…The microbial isolates screened against P. agathidicida during this study were isolated from organic layer soils collected from asymptomatic kauri trees across Waipoua Forest (Northland Region, New Zealand). Soil samples were collected during previous soil sampling as outlined by Byers et al (2020). Following sampling, soils were temporarily stored at 4°C in darkness prior to use in this study.…”

Section: Isolation Of Microorganisms From Kauri Soilmentioning

confidence: 99%

“…One of the wider aims of this kauri dieback project was to understand the microbiome associated with soils associated with asymptomatic kauri trees, i.e. those near diseased trees in infected kauri stands (Byers et al 2020). Therefore, only kauri soil samples that tested negative for the presence of P. agathidicida when screened using a soil baiting bioassay and real-time PCR assay (Than et al 2013;McDougal et al 2014) were used in this study.…”

Section: Isolation Of Microorganisms From Kauri Soilmentioning

confidence: 99%

“…Previous research by Byers et al (2020) identified significant differences in the composition of fungal and bacterial communities associated with asymptomatic and symptomatic kauri trees across Waipoua Forest (Northland Region, New Zealand). Several of the microbial taxa found in significantly higher relative abundance in asymptomatic kauri soils have been previously reported to inhibit various other Phytophthora pathogens.…”

Section: Introductionmentioning

confidence: 99%

“…These include genera such as Penicillium (Fang & Tsao, 1995;Ma et al, 2008), Trichoderma (Ahmed et al 2000;Widmer 2014;Bae et al 2016), and Pseudomonas (Tran et al 2007;Zohara et al 2016;Caulier et al 2018). Although Byers et al (2020) identified microbial taxa associated with potentially disease suppressive soils (i.e. asymptomatic host states), it did not assess whether these taxa exhibit an antagonistic interaction against Phytophthora agathidicida.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Burkholderia and Penicillium isolates from kauri (Agathis australis) soils that inhibit the mycelial growth of Phytophthora agathidicida

Byers¹,

Condron

O’Callaghan

et al. 2021

NZPP

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Phytophthora agathidicida is a highly virulent pathogen of kauri (Agathis australis) and the causal agent of dieback disease in New Zealand’s kauri forests. This study aimed to identify microbial isolates isolated from kauri forest soils that inhibited the growth of P. agathidicida. Three different forms of in vitro bioassays were used to assess the inhibition of each isolate on the mycelial growth of P. agathidicida. Furthermore, head space (HS) solid-phase micro-extraction coupled with gas chromatography-mass spectrometry (SPME-GCMS) was performed to identify if the microbial isolates emitted volatile organic compounds (VOCs), which may be contributing to inhibition. This research identified several bacterial isolates belonging to the genus Burkholderia that inhibited the mycelial growth of P. agathidicida. Furthermore, several VOCs produced by these isolates were putatively identified, which may be responsible for the inhibition observed in the bioassays. Several isolates of Penicillium were identified that inhibit Phytophthora agathidicida, with the culture filtrate of one isolate being found to strongly inhibit P. agathidicida mycelial growth. These isolates of Burkholderia and Penicillium appear to exhibit multiple modes of antagonism against P. agathidicida, including microbial competition and the production of diffusible and volatile anti-microbial compounds. Although further research is needed to better define their mechanisms of inhibition, these findings have identified candidate microbial antagonists of P. agathidicida.

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Genomic Comparisons of Two Armillaria Species with Different Ecological Behaviors and Their Associated Soil Microbial Communities

et al. 2022

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Armillaria species show considerable variation in ecological roles and virulence, from mycorrhizae and saprophytes to important root pathogens of trees and horticultural crops. We studied two Armillaria species that can be found in coniferous forests of northwestern USA and southwestern Canada. Armillaria altimontana is considered as a weak, opportunistic pathogen of coniferous trees, but it also appears to exhibit in situ biological control against A. solidipes, formerly North American A. ostoyae, which is considered a virulent pathogen of coniferous trees. Here, we describe their genome assemblies and present a functional annotation of the predicted genes and proteins for the two Armillaria species that exhibit contrasting ecological roles. In addition, the soil microbial communities were examined in association with the two Armillaria species within a 45-year-old plantation of western white pine (Pinus monticola) in northern Idaho, USA, where A. altimontana was associated with improved tree growth and survival, while A. solidipes was associated with reduced growth and survival.ostoyae) is considered one of the more virulent pathogens [13], although virulence varies depending on isolate, host age and other factors [14]. Armillaria mellea and A. borealis are also considered virulent pathogens, while A. gallica, A. cepistipes, A. gemina, A. calvescens, A. sinapina, and A. nabsnona are considered less virulent or secondary pathogens [10, 12,15, 16]. A recently described species, Armillaria altimontana, formerly North American biological species (NABS) X, is also usually considered as a weak pathogen [17], but evidence for pathogenicity is not well documented [18]. Armillaria solidipes (as A. ostoyae) and A. altimontana have been documented to co-occur within forest stands in the inland northwestern USA [18][19][20]. A previous study in northern Idaho, USA provided evidence that A. altimontana can provide natural biological control of Armillaria root disease of western white pine (Pinus monticola) caused by A. solidipes. In this study, A. solidipes was uncommon in areas dominated by A. altimontana, and trees colonized by A. solidipes were associated with a lower growth and survival than trees colonized only by A. altimontana. The results demonstrated that A. altimontana was not harmful to western white pine within the northern Idaho planting site, and further suggest that A. altimontana behaves as a long-term, in situ biological control agent against A. solidipes [20]. Recognizing the genetic or underlying soil factors that drive host-fungal interactions may provide approaches for enhancing the management of Armillaria root disease.The distribution, life cycle, pathogenicity, and evolutionary relationships have been studied for several Armillaria species [10, 12,14, 16,[21][22][23][24][25]. Collins et al. [26] studied the genome and proteome of A. mellea, identifying carbohydrate degrading enzymes, laccases, and lignin peroxidases among other geneencoded proteins. characterized the transcriptome of an A. solidipe...

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Soil microbial community restructuring and functional changes in ancient kauri (Agathis australis) forests impacted by the invasive pathogen Phytophthora agathidicida

Cited by 18 publications

References 63 publications

Impact of Phytophthora agathidicida infection on canopy and forest floor plant nutrient concentrations and fluxes in a kauri‐dominated forest

Impact of Phytophthora agathidicida infection on canopy and forest floor plant nutrient concentrations and fluxes in a kauri‐dominated forest

Identification of Burkholderia and Penicillium isolates from kauri (Agathis australis) soils that inhibit the mycelial growth of Phytophthora agathidicida

Genomic Comparisons of Two Armillaria Species with Different Ecological Behaviors and Their Associated Soil Microbial Communities

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