MOESM1 of Assessment of drought tolerance of 49 switchgrass (Panicum virgatum) genotypes using physiological and morphological parameters

Additional file 1: Figure S1. Principal component analysis biplot of morphological and physiological traits of 49 switchgrass genotypes under well-watered and drought stress conditions after 15 days of treatment. The seven physiological parameters (Pn, Ci, g s, Tr, RWC, WUE and EL) allow to separate 49 switchgrass genotypes that were either grown under well-watered (circled) or drought treatment (box) conditions. Arrows represent physiological traits with various length based on the impact of each trait on the separation of genotypes. RWC: relative water content; EL: electrolyte leakage; Pn: photosynthetic rate; gs: stomatal conductance; Tr: transpiration rate; Ci: intercellular CO2 concentration; WUE: water use efficiency. LL: leaf length; LW: leaf width; SL: leaf sheath length. Group A: well-watered; Group B: drought treatment