Reference "Comparative analyses of genomic locations and race specificities of loci for quantitative resistance to Pyricularia grisea in rice and barley"

Reference ID

7738

Title

Comparative analyses of genomic locations and race specificities of loci for quantitative resistance to Pyricularia grisea in rice and barley

Source

Proceedings of the National Academy of Sciences of the United States of America, 2003, vol. , pp. -

Authors (6)

Chen-H	Wang-S
Xing-Y	Xu-C
Hayes-P-M	Zhang-Q

Abstract

Comparative genomic analyses have revealed extensive colinearity in gene orders
in distantly related taxa in mammals and grasses, which opened new horizons for
evolutionary study. The objective of our study was to assess syntenic
relationships of quantitative trait loci (QTL) for disease resistance in cereals
by using a model system in which rice and barley were used as the hosts and the
blast fungus Pyricularia grisea Sacc. as the pathogen. In total, 12 QTL against
three isolates were identified in rice; two had effects on all three isolates,
and the other 10 had effects on only one or two of the three isolates. Twelve
QTL for blast resistance were identified in barley; one had effect on all three
isolates, and the other 11 had effects on only one or two of the three isolates.
The observed isolate specificity led to a hypothesis about the durability of
quantitative resistance commonly observed in many plant host-pathogen systems.
Four pairs of the QTL showed corresponding map positions between rice and
barley, two of the four QTL pairs had complete conserved isolate specificity,
and another two QTL pairs had partial conserved isolate specificity. Such
corresponding locations and conserved specificity suggested a common origin and
conserved functionality of the genes underlying the QTL for quantitative
resistance and may have utility in gene discovery, understanding the function of
the genomes, and identifying the evolutionary forces that structured the
organization of the grass genomes.