Susceptibility of Boxwood Accessions from the National Boxwood Collection to Boxwood Blight and Potential for Differences between Calonectria pseudonaviculata and C. henricotiae

LaMondia, J. A.; Shishkoff, Nina

doi:10.21273/hortsci11756-17

Cited by 40 publications

(51 citation statements)

References 13 publications

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“…sempervirens cultivars were very susceptible. These results are in agreement with the previous studies of Henricot et al, , Ehsen (), Ganci et al (), Gehesquière (), LaMondia and Shishkoff (). The inheritance of disease resistance is often complex, and probably even more complex for Buxus , as the B .…”

Section: Discussionsupporting

confidence: 94%

“…However, when the economic damage of the pathogen is high, as is the case for Calonectria in Buxus , disease resistance becomes a high priority in breeding programmes (Leus, ). The high genetic variation (Thammina et al, ; Van Laere et al, ) and the availability of sources of disease resistance within the Buxus genus (Gehesquière, ; Henricot et al, ; LaMondia & Shishkoff, ) have created opportunities for an interspecific breeding programme with a focus on disease resistance (Van Laere et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…For Buxus, it is known that the susceptibility to C. pseudonaviculata of a given cultivar under practical conditions can be estimated based on two general aspects: the host's susceptibility to infection and the extent of lesion growth following infection with C. pseudonaviculata (Gehesquière, ; LaMondia & Shishkoff, ). In our study, B .…”

Section: Discussionmentioning

confidence: 99%

“…microphylla and B . harlandii (Ehsen, ; Ganci, Benson, & Ivors, ; Gehesquière, ; Guo, Olsen, Kramer, & Pooler, ; LaMondia & Shishkoff, ). Within B .…”

Section: Introductionunclassified

“…In vivo host susceptibility screenings demonstrate that in general, the B. sempervirens species are more susceptible to Calonectria than the Asiatic species B. microphylla and B. harlandii (Ehsen, 2011;Ganci, Benson, & Ivors, 2013;Gehesquière, 2014;Guo, Olsen, Kramer, & Pooler, 2016;LaMondia & Shishkoff, 2017). Within B. sempervirens, various degrees of susceptibility are also observed among different cultivars (Avenot, King, Edwards, Baudoin, & Hong, 2017).…”

mentioning

confidence: 99%

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Breeding and selection of Buxus for resistance to Calonectria pseudonaviculata

Laere

Heungens

Gehesquière

et al. 2019

Journal of Phytopathology

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Box blight is a widespread disease of Buxus caused by the pathogen Calonectria pseudonaviculata. It is responsible for significant losses in nurseries, gardens and wild boxwood populations. Our goal was to maximize the efficiency of a breeding programme towards increased disease resistance. The use of artificial inoculation of young F1 seedlings with C. pseudonaviculata spores under greenhouse conditions appeared to be a reliable tool for early selection of interesting prebreeding material. Overall, the four hybrid populations screened showed a segregating behaviour between their parents when determining the percentage of diseased leaves and lesion diameter. Genotypes were also found with an increased tolerance as compared to the parental species. Approximately 50% of the seedlings had the same score for both parameters after artificial inoculation in the greenhouse and in the field. Of the seedlings that showed severe symptoms in the greenhouse, <15% showed no disease symptoms in the field. Therefore, for larger breeding programmes, we propose a two‐step selection procedure: first artificial inoculation at seedling level to eliminate all genotypes with severe symptoms and then evaluation of the remaining seedlings in the field. Using this strategy, we were able to select several genotypes in our four hybrid populations with improved resistance to C. pseudonaviculata.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…microphylla and B . harlandii (Ehsen, ; Ganci, Benson, & Ivors, ; Gehesquière, ; Guo, Olsen, Kramer, & Pooler, ; LaMondia & Shishkoff, ). Within B .…”

Section: Introductionunclassified

mentioning

confidence: 99%

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Breeding and selection of Buxus for resistance to Calonectria pseudonaviculata

Laere

Heungens

Gehesquière

et al. 2019

Journal of Phytopathology

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Prokaryotic taxa play keystone roles in the soil microbiome associated with woody perennial plants in the genus Buxus

LeBlanc

Crouch

2019

Ecology and Evolution

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The microbiome associated with ornamental plants has largely been neglected, despite its potential for impacting plant health. This work characterized the composition, diversity, and microbial co‐associations in the soil microbiome associated with species and cultivars of plant in the genus Buxus (common name boxwood), a group of woody perennial shrubs commonly used in residential landscapes and found in native ecosystems. Soil was collected from 82 individual curated boxwood accessions at the U.S. National Arboretum National Boxwood Collection. Amplicon libraries targeting archaea, bacteria, and fungi were generated and sequenced using the Illumina MiSeq platform. Identification of individual sequence variants resulted in 275 archaeal, 15,580 bacterial, and 7,525 fungal taxa. Neither spatial distance among samples nor association with different types of boxwood were significant predictors of soil microbiome composition. However, archaeal and bacterial diversity was significantly different in soil from distinct types of boxwood. Co‐association networks indicated that archaea and bacteria show greater evidence of being keystone taxa than fungi. Overall, this work demonstrates the potential for targeting specific keystone taxa to shift the soil microbiome associated with these boxwood accessions and that planting different species or cultivars in the landscape may shift the diversity of prokaryotic microorganisms.

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Boxwood blight: an ongoing threat to ornamental and native boxwood

LeBlanc

Salgado‐Salazar

Crouch

2018

Appl Microbiol Biotechnol

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Boxwood blight is an emerging disease of ornamental and native boxwood plants in the family Buxaceae. First documented in the 1990s at a single location in England, the disease is now reported throughout Europe, Asia, New Zealand, and North America. To address the growing concern over boxwood blight, ongoing research focuses on multiple biological and genetic aspects of the causal pathogens and susceptible host plants. Characterization of genetic variation among the Calonectria fungi that cause boxwood blight shows that two unique sister species with different geographic distributions incite the disease. Studies of the pathogen life cycle show the formation of long-lived survival structures and that host infection is dependent on inoculum density, temperature, and humidity. Host range investigations detail high levels of susceptibility among boxwood as well as the potential for asymptomatic boxwood infection and for other plants in the family Buxaceae to serve as additional hosts. Multiple DNA-based diagnostic assays are available, ranging from probe-based quantitative PCR assays to the use of comparative genomics to develop robust diagnostic markers or provide whole genome-scale identifications. Though many questions remain, the research that continues to address boxwood blight demonstrates the importance of applying a multidisciplinary approach to understand and control emerging plant diseases.

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Susceptibility of Boxwood Accessions from the National Boxwood Collection to Boxwood Blight and Potential for Differences between Calonectria pseudonaviculata and C. henricotiae

Cited by 40 publications

References 13 publications

Breeding and selection of Buxus for resistance to Calonectria pseudonaviculata

Breeding and selection of Buxus for resistance to Calonectria pseudonaviculata

Prokaryotic taxa play keystone roles in the soil microbiome associated with woody perennial plants in the genus Buxus

Boxwood blight: an ongoing threat to ornamental and native boxwood

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