Articles
STABILITY OF HOST RESISTANCE OF PEAR TO FIRE BLIGHT
Article number
411_84
Pages
413 – 414
Language
Abstract
Differential virulence of the fire blight pathogen, Erwinia amylovora (Burr.) Winsl. et al., for pear (Pyrus sp.) was investigated in a series of three experiments.
Experiment 1 consisted of eight isolates and eight host genotypes; experiment 2 consisted of eight isolates and 15 host genotypes; experiment 3 consisted of 10 isolates and 2 host genotypes.
Host genotypes in experiments 1 and 2 were chosen to represent a diverse genetic background, and included major sources of resistance used in the USDA and other pear breeding programs.
In experiment 3, only one susceptible genotype, ‘Bartlett’, and one resistant genotype, US 65063-044, were used.
Isolates shown to be differentially virulent on certain apple clones were included in all experiments.
Ten actively growing shoots of each host were inoculated with each isolate in each year in experiments 1 and 2, and in experiment 3, 20 shoots of each host x isolate combination were inoculated.
Lesion length as a proportion of total shoot length was analyzed.
Experiment 2 was repeated in three years to provide a measure of repeatability over time.
No consistent isolate x host genotype interaction was detected, suggesting that differential virulence is not a major concern in breeding for fire blight resistance in pear using the current sources of resistance.
Experiment 1 consisted of eight isolates and eight host genotypes; experiment 2 consisted of eight isolates and 15 host genotypes; experiment 3 consisted of 10 isolates and 2 host genotypes.
Host genotypes in experiments 1 and 2 were chosen to represent a diverse genetic background, and included major sources of resistance used in the USDA and other pear breeding programs.
In experiment 3, only one susceptible genotype, ‘Bartlett’, and one resistant genotype, US 65063-044, were used.
Isolates shown to be differentially virulent on certain apple clones were included in all experiments.
Ten actively growing shoots of each host were inoculated with each isolate in each year in experiments 1 and 2, and in experiment 3, 20 shoots of each host x isolate combination were inoculated.
Lesion length as a proportion of total shoot length was analyzed.
Experiment 2 was repeated in three years to provide a measure of repeatability over time.
No consistent isolate x host genotype interaction was detected, suggesting that differential virulence is not a major concern in breeding for fire blight resistance in pear using the current sources of resistance.
Publication
Authors
R.L. Bell, T. van der Zwet
Keywords
Online Articles (87)