Location: Peanut ResearchTitle: Physiological Response to Drought Stress at Different Stages in Peanut Author
Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 7/10/2012
Publication Date: 7/10/2012
Citation: Chen, C., Dang, P.M., Sorensen, R.B., Lamb, M.C., Holbrook Jr, C.C. 2012. Physiological Response to Drought Stress at Different Stages in Peanut. American Peanut Research and Education Society. July 10-12, 2012. Raleigh, NC. Interpretive Summary: not required
Technical Abstract: Drought is a major factor in reducing productivity in peanut (Arachis hypogaea L.). The objectives of this study were to: 1) investigate the response patterns of relative water content (RWC), specific leaf area (SLA), and leaf dry mater content (LDMC) to drought stress at three stages of 30 60, and 90 Days After Planting (DAP) in comparison to irrigated and non-irrigated treatments; and 2) indentify the critical stage that can differentiate genotypes and can be used for further genetic study and breeding program. Five peanut genotypes (AP3, C76-16, A104, Georgia Green, 08T-12) were planted in split plot design, with irrigation treatment (main split) by genotype with three replications in 2010 and 2011. This project was completed using rain-out control shelters. RWC, SLA, and LDMC were measured in five times of one-week interval in each stage. The results showed that there were no distinguishable patterns among treatments for SLA and LDMC. However, there were distinct patterns corresponding to stages and genotypes for RWC in 60 and 90 DAP. The data showed significant distinct stages were at 60 and 90 DAPs after three-week stress for RWC. ‘C76-16’ and ‘A104’ had higher RWCs in 90 DAP but lower in 60 DAP, indicating a late season drought resistance. ‘Georgia Green’ had a higher RWC in 60 DAP and lower in 90 DAP, showing a middle season drought tolerance. ‘AP-3’ showed lower RWCs both in 60 and 90 DAPs. These data imply that ‘C76-16’ and ‘Georgia Green’ had different mechanisms involving drought resistance and three-week drought stress treatments at 60 and 90 DAPs could be used as screening tool in gene express study and breeding programs.