Fig. 2

Growth and physiological indices. A–D indicate changes in leaf SPAD (chlorophyll content), relative water content, relative electric conductivity, and plant height under salt stress, respectively. E–G indicate the relative value (T/CK) of the leaf K⁺ content, Na⁺ content, and Na⁺: K⁺ ratio, respectively. H–J indicate the relative value of the root K⁺ content, Na⁺ content, and Na⁺: K⁺ ratio, respectively. Black, red, blue, and green indicate the three parents Mo17, T. dactyloides, Z. perennis, and tri-species hybrid MTP, respectively