Evaluation of Responsivity to Drought Stress Using Infrared Thermography and Chlorophyll Fluorescence in Potted Clones of Cryptomeria japonica

As climate change progresses, the breeding of drought-tolerant forest trees is necessary. Breeding requires screening for drought stress using a large number individuals and high-throughput phenotyping method. The aim this study was therefore to establish methods evaluating clonal responses infrared thermography chlorophyll fluorescence in Cryptomeria japonica. stomatal conductance index (Ig), maximum photochemical quantum yield photosystem II (Fv/Fm), axial growth four plus-tree clones C. japonica planted pots were measured weekly 85 days after irrigation stopped. phenotypic trait responsivity estimated by nonlinear mixed model introducing cumulative water index, which considers past history soil environment. These procedures enabled us evaluate could be applied large-scale clone materials promote program tolerance.