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Little is known about the interplay between Ca 2+  and H 2 O 2  signaling in stressed cool-season turfgrass. To understand better how Ca 2+  and H 2 O 2  signals are integrated to enhance grass acclimation to stress conditions, we analyzed the rearrangements of endogenous ion accumulation, antioxidant systems and secondary metabolism in roots, stems and leaves of perennial ryegrass ( Lolium perenne  L.) treated with exogenous Ca 2+  and H 2 O 2  under salinity. Ca 2+  signaling remarkably enhanced the physiological response to salt conditions. Ca 2+  signaling could maintain ROS homeostasis in stressed grass by increasing the responses of antioxidant genes, proteins and enzymes. H 2 O 2  signaling could activate ROS homeostasis by inducing antioxidant genes but weakened Ca 2+  signaling in leaves. Furthermore, the metabolic profiles revealed that sugars and sugar alcohol accounted for 49.5–88.2% of all metabolites accumulation in all treated leaves and roots. However, the accumulation of these sugars and sugar alcohols displayed opposing trends between Ca 2+  and H 2 O 2  application in salt-stressed plants, which suggests that these metabolites are the common regulatory factor for Ca 2+  and H 2 O 2  signals. These findings assist in understanding better the integrated network in Ca 2+  and H 2 O 2  of cool-season turfgrass’ response to salinity.

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H2O2 and Ca2+-based signaling and associated ion accumulation, antioxidant systems and secondary metabolism orchestrate the response to NaCl stress in perennial ryegrass