Inheritance of Bacterial Leaf Blight Resistance in Crosses Involving Interspecific and Intraspecific Rice Genotypes
Abstract
188 words
Bacterial leaf blight (BLB) of rice, caused by Xanthomonas
oryzae pv. oryzae is a destructive disease prevalent in most
rice growing countries. It is a serious problem under all
managements, but especially in irrigated and high fertilizer input
conditions, which are conducive to disease development. The
disease causes reductions in crop yields as high as 80% and
deterioration of grain quality under severe epidemics. Control
of the disease through the use of chemicals is not cost effective
or environmentally friendly for resource-constrained farmers.
Use of resistant varieties is considered the only viable option.
However, this requires prior information concerning the mode
of inheritance of the BLB resistance trait. Some studies showed
that resistance is a monogenic recessive trait, whereas in other
studies it was found to be due to incomplete dominance, with
preponderance of additive effect. In Ugandan rice populations,
detection of epistatic effects on inheritance of BLB resistance
and the resistance of “universally susceptible” IR24 to some
local BLB pathotypes provides additional justification to dissect
the nature of gene action and the magnitude of G x E in the
new sources in order to guide breeding strategies.
Subjects
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