Abstract:
The aims of this study were to evaluate genetic variations
in yield and reproductive developmental characters among peanut genotypes
in response to drought and relate these responses to pod yield under different
soil moisture. Eleven peanut genotypes were tested under three soil moisture
levels [field capacity (FC), 2/3 available soil water (AW) and 1/3AW]
in field experiments. Data were recorded for number of flowers, pegs (RSs),
immature pods and mature pods per plant, seed per pod, 100-seed weight
and pod yield at harvest. A drought tolerance index (DTI) for pod yield
was calculated as the ratio of pod yield under stress treatment to that
under well-watered conditions. The differences among water regimes were
significant for pod yield, number of RSs, immature pods and mature pods
per plant, seed per pod and 100 seed weight and differences among genotypes
were significant for all traits. Drought reduced pod yield, number of
RSs, pods and mature pods per plant. Early peak of flowering is important
for the formation of mature pods under drought conditions. Two different
strategies were used in maintaining high pod yield under drought. High
yield potential was important for ICGV 98348 and ICGV 98353, whereas low
pod yield reduction was important for ICGV 98305, ICGV 98303 and ICGV
98300. Tifton 8 showed the lowest pod yield and poor seed filling. High
RSs and well-filled mature pods were the most important traits contributing
to high pod yield in drought resistant genotypes.
P. Songsri, S. Jogloy, T. Kesmala, N. Vorasoot, C. Akkasaeng, A. Patanothai and C.C. Holbrook, 2008. Response of Reproductive Characters of Drought Resistant Peanut Genotypes to Drought. Asian Journal of Plant Sciences, 7: 427-439.
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