Genetic and Pathogenic Variation in Phytophthora cactorum Affecting Fruit and Nut Crops in California

Plant Disease
R G BhatG T Browne

Abstract

Isolates of Phytophthora cactorum and 15 other species of Phytophthora were characterized according to their genomic DNA, pathogenicity, and sensitivity to mefenoxam. Amplified fragment length polymorphism (AFLP) analysis was completed for 132 isolates of P. cactorum (30 from almond, 86 from strawberry, 5 from walnut, and 11 from other hosts) and 22 isolates of 15 other Phytophthora spp. from various hosts. All 16 Phytophthora spp. were distinguishable by unique AFLP banding patterns. Cluster analysis of the AFLP data revealed high coefficients of genetic similarity (>0.9) among all California isolates of P. cactorum. Analysis of molecular variance indicated that, among all 132 isolates of P. cactorum, 30.8 and 24.5% of the AFLP variation was associated with hosts and geographical sources of isolates, respectively, whereas 15.0% of the variation was associated with isolate niche (i.e., an aerial plant part, portion of the root system, or soil). Among the 86 isolates of P. cactorum from strawberry, characterization by source in the production system (i.e., fruiting field or plant nursery) did not account for a significant proportion of the variation (0.6%, P = 0.204). In pathogenicity tests on strawberry plants (cv. Diamante) in...Continue Reading

References

Nov 11, 1995·Nucleic Acids Research·P VosM Kuiper
Jun 1, 1997·Fungal Genetics and Biology : FG & B· Van der Lee TF Govers
Oct 24, 2008·Phytopathology·W G PerezR J Nelson

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Citations

Oct 24, 2008·Phytopathology·L L A CarterR K Webster
Jan 23, 2019·Plant Disease·Kathleen M McKeever, Gary A Chastagner
Jan 1, 2014·Plant Disease·J C Bienapfl, Y Balci

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