Abstract
Ten F2 clones from an initial hybridization of Prunus webbii × Prunus persica cv Harrow Blood were evaluated under greenhouse conditions for their reaction to Xylella fastidiosa subsp. fastidiosa strain M23 during two growing seasons. Clonal accessions used for the study were selected on the basis of horticultural diversity, and were a small subset of trees from a large F2 population. Foliar symptoms of M23-inoculated trees were monitored weekly throughout the 20-week growth period. Clones were then sampled for bacterial titer determinations. With the exception of parental accession Harrow Blood, all clones yielded measurable titer; however, almond leaf scorch disease symptoms were never observed in five of the ten sibling clonal accessions. Vegetative bud break and bloom phenology data collected from field-grown mother trees over a 7 year period as well as leaf morphology characters of the clonal accessions were examined for associations with bacterial titers of inoculated clones using a principal components analysis. No clear associations were noted, with small sample size limiting the predictive ability of the analysis.
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Acknowledgements
The authors would like to acknowledge anonymous Reviewer 1 for their committed efforts in improving this manuscript. We gratefully acknowledge Biological Technician Page Johnston for collection of leaf morphology data from mother trees as well as for dedicated care of trialed clones during the two growing seasons. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.
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Ledbetter, C.A., Lee, S. Diversity of Xylella fastidiosa host suitability among siblings from a non-traditional interspecific Prunus cross. Euphytica 214, 84 (2018). https://doi.org/10.1007/s10681-018-2167-6
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DOI: https://doi.org/10.1007/s10681-018-2167-6