Photosynthetica X:X | DOI: 10.32615/ps.2026.020
Differentiating seasonal trends and environmental responses in wheat through longitudinal chlorophyll a fluorescence phenotyping
- 1 Institute of Plant and Environmental Sciences, Slovak University of Agriculture in Nitra, A. Hlinku 2, 94976 Nitra, Slovakia
- 2 Research Institute of Plant Production, National Agricultural and Food Centre, Bratislavská cesta 122, 92168 Piestany, Slovakia
Broad adoption of chlorophyll fluorescence kinetics in crop phenotyping remains limited by inconsistent parameter definitions and insufficient physiological validation. This study employed a longitudinal phenomic approach to evaluate the diagnostic value of rapid chlorophyll a fluorescence kinetics across diverse wheat genotypes throughout a spring growing season. By combining JIP-test parameters with detailed growth analysis, we built a statistical framework quantifying the predictive power and unexplained variance of biophysical parameters derived from the JIP-test, with an emphasis on performance-estimating indices. Results show that conventional parameters, such as maximum quantum yield of primary photochemistry, remain stable during vegetative growth and are highly sensitive to terminal senescence, yet display considerable noise under transient environmental fluctuations. Conversely, integrative indicators, particularly the total performance index, revealed clear seasonal trends and strong correlations with growth dynamics. By grouping JIP-test parameters functionally, this study offers a rational framework for selecting biophysical indices suited to specific breeding or research goals.
Additional key words: chlorophyll a fluorescence; high-throughput phenotyping; JIP-test; photosynthetic performance; total performance index; wheat.
Received: April 6, 2026; Revised: July 9, 2026; Accepted: July 21, 2026; Prepublished online: September 8, 2026
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