|Islam, Md Sajedul - Foreign Agricultural Service (FAS, USDA)|
|Cabrera-la Rosa, Juan - Non ARS Employee|
|Civerolo, Edwin - Retired ARS Employee|
|Groves, Russell - University Of Wisconsin|
Submitted to: CDFA Pierce's Disease Control Program Research Symposium
Publication Type: Abstract Only
Publication Acceptance Date: 11/6/2014
Publication Date: 12/15/2014
Citation: Lin, H., Islam, M., Cabrera-La Rosa, J., Civerolo, E.L., Groves, R.L. 2014. Host selection and adaptation are major driving forces shaping ALS Xylella fastidiosa population structure in the San Joaquin Valley of California. CDFA Pierce's Disease Control Program Research Symposium, December 15-17, 2014, Sacramento, California. p.94.
Technical Abstract: Xylella fastidiosa (Xf) causes disease in many commercial crops including almond leaf scorch (ALS) disease in susceptible almond (Prunus dulcis). In this study, genetic diversity and population structure of Xf associated with ALS disease were evaluated. Strains from two almond production sites in the San Joaquin Valley of California were collected and analyzed with multiple locus DNA markers. The distribution of genotypes, combined with UPGMA and PCA analyses identified two major genetic clusters that were associated with cultivars ‘Sonora’ and ‘Nonpareil’ regardless of the year of study or location. These relationships suggest that host selection and adaptation are major driving forces that are shaping ALS Xf population structure in the San Joaquin Valley. This finding could provide insight into understanding pathogen adaptation and host selection in the context of ALS disease dynamics.