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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #388981
Research Project: Development of High-Yielding, High-Oleic Peanut Cultivars or Germplasm with Tolerance to Biotic and Abiotic Stresses

Location: Crop Genetics and Breeding Research

Title: The variation of relative water content, SPAD chlorophyll meter reading, stomatal conductance, leaf area, and specific leaf area of Jerusalem artichoke genotypes under different durations of terminal drought in tropic region

Author
item CHAIMALA, AUNCHANA - Khon Kaen University
item JOGLOY, SANUN - Khon Kaen University
item VORASOOT, NIMITR - Khon Kaen University
item Holbrook, Carl - Corley
item KVIEN, CRAIG - Khon Kaen University

Submitted to: Journal of Agronomy and Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/6/2021
Publication Date: 10/19/2021
Citation: Chaimala, A., Jogloy, S., Vorasoot, N., Holbrook Jr, C.C., Kvien, C.K. 2021. The variation of relative water content, SPAD chlorophyll meter reading, stomatal conductance, leaf area, and specific leaf area of Jerusalem artichoke genotypes under different durations of terminal drought in tropical region. Journal of Agronomy and Crop Science. 00:1-15. https://www.doi.org/10.1111/jac.12561.
DOI: https://doi.org/10.1111/jac.12561

Interpretive Summary: An important challenge in current breeding programs of Jerusalem artichoke (JA) is to develop drought tolerant genotypes having high yield potential under full irrigation and also having low yield reductions under drought stressed conditions. Physiological traits may be used as surrogate traits for identifying drought tolerant genotypes. We examined six genotypes under three irrigation treatments. The irrigation treatments were no-drought, short and long periods of late season drought. Our results revealed that relative water content, stomatal conductance and leaf area could be applied as surrogate traits to develop high yield production and drought-tolerant genotypes. Collectively, this work showed that SPAD chlorophyll meter is an easier technique for assessing chlorophyll density and can be collected within a short time enabling large-scale breeding programs. HEL 256, JA 37 and JA 125 were identified as drought-tolerant genotypes since they exhibited lower reductions for fresh and dry tuber weights.

Technical Abstract: This work assessed the response of Jerusalem artichoke (JA) genotypes for relative water content (RWC), SPAD chlorophyll meter reading (SCMR), stomatal conductance (SC), leaf area (LA) and specific leaf area (SLA), investigated the association of those traits with yield and yield reduction under different terminal drought durations, and identified surrogate traits and JA genotypes with those traits for drought tolerance. Field research was conducted during the late rainy season for two years using a split-plot design with four replications. The three irrigation treatments were no-drought (SD0), short (SD1) and long (SD2) duration of terminal drought durations and were arranged as main-plots, and sub-plots were six genotypes of JA. The results demonstrated that terminal drought durations whether SD1 or SD2, drastically reduced the RWC, SC, LA, and SLA. In contrast, SCMR slightly increased under SD2 compared to terminal drought at SD1. HEL 256, JA37 and JA125 were identified as drought-tolerant genotypes since they exhibited lower reductions for fresh and dry tuber weights under SD2. These new findings revealed that RWC, SC and LA could be applied as surrogate traits to develop high economic yield production and drought-tolerant genotypes. Collectively, this work showed that SCMR is an easier technique for assessing chlorophyll density and can be collected within a short time enabling large-scale breeding programs.