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Differential Resistance to Botryosphaeria ribis Among Cercis Taxa
M R Pooler1, K A Jacobs2, M Kramer3
1USDA/ARS/US National Arboretum, 3501 New York Ave., NE, Washington, DC 20002.
Plant Disease
|March 2, 2019
Summary
North American redbud (Cercis sp.) species are more susceptible to Botryosphaeria ribis fungal canker than Asian species. Plant size and genetic variation within species significantly influence disease resistance, impacting large-scale ornamental production.
Area of Science:
- Plant pathology
- Horticultural science
- Botany
Background:
- Redbud (Cercis sp.) is a commercially valuable ornamental tree known for early spring blooms and adaptability.
- Large-scale redbud production is hindered by susceptibility to Botryosphaeria ribis fungal canker.
Purpose of the Study:
- To screen various Cercis taxa for their response to Botryosphaeria ribis inoculation.
- To identify factors influencing redbud susceptibility to fungal canker.
Main Methods:
- Inoculation of 711 plants across 11 Cercis taxa with Botryosphaeria ribis.
- Logistic regression analysis using taxa and stem diameter to assess disease variation.
- Comparison of disease incidence across 11 seed lots of Cercis canadensis.
Main Results:
- North American native taxa (C. canadensis, C. occidentalis) showed higher susceptibility compared to Asian species.
- Plant size (stem diameter) and taxon significantly influenced disease expression, explaining 41% of variation.
- Intraspecific variation among seed lots contributed to a high level of unexplained variation (59%).
Conclusions:
- Redbud susceptibility to B. ribis is influenced by both genetic (taxon) and non-genetic (size) factors.
- Significant intraspecific variation exists, suggesting seed source is critical for managing disease resistance.
- Understanding these factors is crucial for improving large-scale cultivation and disease management strategies for redbud trees.
Keywords:
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