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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #315780
Title: Relationship between physiological traits and yield components of peanut genotypes with different levels of terminal drought resistance

Author
item KOOLACHART, R - Khon Kaen University
item SURIHARN, B - Khon Kaen University
item JOGLOY, S - Khon Kaen University
item VORASOOT, N - Khon Kaen University
item WONGKAEW, S - Khon Kaen University
item Holbrook, Carl - Corley
item JONGRUNGKLANG, N - Khon Kaen University
item KESMALA, T - Khon Kaen University
item PATANOTHAI, A - Khon Kaen University

Submitted to: SABRAO J. of Breeding and Genetics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/15/2013
Publication Date: 11/15/2013
Citation: Koolachart, R., Suriharn, B., Jogloy, S., Vorasoot, N., Wongkaew, S., Holbrook Jr, C.C., Jongrungklang, N., Kesmala, T., Patanothai, A. 2013. Relationship between physiological traits and yield components of peanut genotypes with different levels of terminal drought resistance. SABRAO J. of Breeding and Genetics. 45:422-446.

Interpretive Summary: The objective of this study was to examine the relationships between physiological traits and yield components of peanut genotypes with different levels of terminal drought resistance. Five peanut genotypes were evaluated under two soil moisture levels. Three genotypes were identified that performed well for various physiological traits and yield components. The results suggested that the ability to maintain physiological traits and yield components could aid peanut genotypes in sustaining high pod yield under stress conditions. Selection for these traits in a breeding program may result in the development of peanut cultivars with improved drought tolerance.

Technical Abstract: The relationships between physiological traits related to drought tolerance and yield components of peanut genotypes are not well understood. The objective of this study was to investigate the relationships between physiological traits related to drought tolerance and yield components of peanut genotypes with different levels of terminal drought resistance. A field experiment was conducted at Khon Kaen University during 2010/11 and 2011/12. A split plot design with 4 replications for 2 years was used. Five peanut genotypes were assigned in subplots and 2 soil moisture levels were assigned in main plots. Data were recorded for physiological traits consisting of leaf area index (LAI), specific leaf area (SLA), relative water content (RWC), SPAD chlorophyll meter reading (SCMR), canopy temperature and stomatal conductance at R7 stage and harvest, and yield components consisting of number of pods plant-1, number of seed pod-1 and 100-seed weight were recorded at harvest. Peanut genotypes with high LAI, SCMR, RWC and stomatal conductance, low SLA and canopy temperature and high drought tolerant index (DTI) for number of pods plant-1, DTI for number of seeds pod-1 and DTI for 100-seed weight could maintain high pod yield under drought conditions. Genotypes ICGV 98324, ICGV 98348 and Tifton 8 performed well for various physiological traits and yield components. The results suggested that ability to maintain physiological traits and yield components could aid peanut genotypes in sustaining high yield under stress conditions.