Abstract:
The objectives of this study were to estimate heritability
for PBNV resistance parameters and to determine phenotypic and genotypic
correlations among PBNV resistance parameters and agronomic traits. One
hundred and ninety two progenies in the F5 and F6
generations of peanut as well as their parents were evaluated under natural
infection of PBNV in a randomized complete block design with six replications
for two years. Additional experiment of the duplicated materials was also
conducted for agronomic evaluation for one year using similar experimental
procedures under conditions that favored optimum agronomic performance.
Heritability estimates were low to relatively high for both disease incidence
and disease severity, depending on crosses, ranging form 0.10 to 0.90
and 0.00 to 0.79, respectively. Phenotypic and genotypic correlation coefficients
for PBND incidence and PBND severity were high, ranging from 0.94** to
0.98** and 0.99** and 1.00**, respectively. Phenotypic and genotypic correlation
coefficients between PBNV resistance parameters and agronomic characters
were generally low for most pairs of characters, except between PBNV resistance
parameters and 100-seed weight for which it was moderate (0.42** to 0.60**)
PBNV susceptibility is somewhat associated with larger seed and might
hinder the progress of breeding for large-seeded peanut with resistance
to PBNV.
R. Puttha, S. Jogloy, S. Wongkaew, J. Sanitchon, T. Kesmala and A. Patanothai, 2008. Heritability, Phenotypic and Genotypic Correlation of Peanut bud necrosis virus Resistance and Agronomic Traits in Peanut. Asian Journal of Plant Sciences, 7: 276-283.
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