Breeding for quantitative resistance is albeit
challenging often due to compounding effects
of genotype by environment interactions that can
be compounded by a variable pathogen
population. In this study this was the case, the
greenhouse had higher severity than the field.
TLB disease epidemics are favoured by high
rainfall and relative humidity and moderate
temperatures (Hennessy et al., 1990; Carson
2005), so higher disease severities in the
greenhouse than in both field evaluations were
not surprising, since E. turcicum is a necrotroph
that requires high humidity and warm temperature
for infection (Adipala et al., 1993); and such
conditions are common under greenhouse
conditions. Taken together, the results of this
study suggest that resistance in sorghum to E.
turcicum is quantitative, with some contribution
of additive, dominance and epistatic effects.
Results also highlight that environment can have
major effects on the disease response of specific
sorghum genotypes to Turcicum leaf blight.
Breeding for quantitative resistance is albeit
challenging often due to compounding effects
of genotype by environment interactions that can
be compounded by a variable pathogen
population. In this study this was the case, the
greenhouse had higher severity than the field.
TLB disease epidemics are favoured by high
rainfall and relative humidity and moderate
temperatures (Hennessy et al., 1990; Carson
2005), so higher disease severities in the
greenhouse than in both field evaluations were
not surprising, since E. turcicum is a necrotroph
that requires high humidity and warm temperature
for infection (Adipala et al., 1993); and such
conditions are common under greenhouse
conditions. Taken together, the results of this
study suggest that resistance in sorghum to E.
turcicum is quantitative, with some contribution
of additive, dominance and epistatic effects.
Results also highlight that environment can have
major effects on the disease response of specific
sorghum genotypes to Turcicum leaf blight.
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