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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #305195
Title: Response of reproductive parts of peanut genotypic variation and their contributions to yield after pre-flowering drought

Author
item PUANGBUT, D - Khon Kaen University
item JOGLOY, S - Khon Kaen University
item VORASOOT, N - Khon Kaen University
item KESMALA, T - Khon Kaen University
item Holbrook, Carl - Corley
item PATANOTHAI, A - Khon Kaen University

Submitted to: Australian Journal of Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/20/2014
Publication Date: 6/5/2014
Citation: Puangbut, D., Jogloy, S., Vorasoot, N., Kesmala, T., Holbrook Jr, C.C., Patanothai, A. 2014. Response of reproductive parts of peanut genotypic variation and their contributions to yield after pre-flowering drought. Australian Journal of Crop Science. 7:1627-1633.

Interpretive Summary: Pre-flowering drought stress (PFD) has occasionally been observed to increase final yield of peanut. There is limited information on the physiological causes of this yield increase, and limited information on possible genetic differences for this response. The objective of this study was to determine the variability in physiological response of peanut genotypes subjected to PFD and their contribution to yield. A field experiment was conducted to evaluate 11 peanut genotypes under fully irrigated and PFD conditions. Genotypes differed in their response to PFD, but PFD increased number of flowers, number of pegs, number of pods and number of mature pods in many of the genotypes. The results indicated that number of mature pods was the most important component contributing to high yield under PFD conditions.

Technical Abstract: Pre-flowering drought (PFD) has been observed to increase yield of peanut. There is limited information on genotypic variation in reproductive response to PFD and contributions to yield under PFD and their contributions to yield. The objective of this study was to determine the variability in reproductive response of peanut genotypes subjected to PFD and their contribution to yield. A field experiment was conducted in a split-plot design with four replications for two seasons. PFD (1/3 available water from emergence to 40 days after emergence) and irrigated control were assigned in main-plots, and 11 peanut genotypes were assigned in sub-plots. Data were recorded for reproductive parts (number of flowers, number of pegs, number of pods, and number of mature pods per plant), seed per pod, 100 seed weight and pod yield at harvest. Genotypes differed in their response to PFD, but PFD increased number of flowers, number of pegs, number of pods and number of mature pods per plant in many genotypes. Production of reproductive parts differed significantly under the PFD with ICGV 98300, ICGV 98303, ICGV 98330 and Tainan 9 having the highest in number of flowers, number of pegs, number of pods and number of mature pods. These genotypes also had high yield under PFD conditions. The results indicated that number of mature pods were the most important component contributing to high yield under PFD conditions. Thus selecting for increased number of mature pods under PFD would be expected to improve pod yields.