Distribution of Xylella fastidiosa in Sycamore Associated with Low Temperature and Host Resistance

Plant Disease
T S M HennebergerC J Chang

Abstract

Experiments were conducted in the field and laboratory to determine effects of low temperatures on Xylella fastidiosa populations in American sycamore. Roots and shoots from naturally infected trees at two locations were collected monthly. Sap extracted from the samples was tested by enzyme-linked immunosorbent assay for presence of X. fastidosa and was diluted and plated on periwinkle wilt medium to determine populations of viable bacteria. Cumulative rainfall and hours below temperature thresholds (-5 to 10°C) were recorded at each site. Bacterial populations in shoots were negatively correlated with cumulative hours below -5°C air temperature (r= -0.96). In roots, bacterial populations were only weakly correlated with cumulative hours below soil temperature thresholds (-0.61 < r <-0.25). Bacterial populations were not correlated with monthly rainfall. In the laboratory, resistant and susceptible sycamore trees were inoculated with X. fastidiosa and held in the dark at 5°C or 22°C. After 12 weeks, inoculated stem sections were collected and sap was extracted and tested as described previously. Stems that tested positive for X. fastidiosa were divided into additional samples and tested as described above. Results of the labora...Continue Reading

References

Mar 17, 1999·Yeast
Apr 5, 2000·Canadian Journal of Microbiology·C J Chang, R C Donaldson
Dec 19, 2000·Yeast·J M Dow, M J Daniels
Jan 1, 1996·Annual Review of Phytopathology·A H Purcell, D L Hopkins

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Citations

May 18, 2019·Journal of Mathematical Biology·Candy AbboudSamuel Soubeyrand
Apr 22, 2008·Annual Review of Phytopathology·Subhadeep ChatterjeeSteven Lindow
Oct 1, 2005·Plant Disease·Kendra Baumgartner, Jeremy G Warren
Jul 23, 2018·EFSA Journal·UNKNOWN EFSA Panel on Plant Health (EFSA PLH Panel)Claude Bragard

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