The hormone ABA is well-known as a mediator in plant responses for both biotic and abiotic stresses. Endogenous ABA concentrations fluctuate in response to environmental conditions, 30 allowing plants to survive under adverse conditions,
such as salt stress. In H. rosa-sinensis plants, salinity increased ABA content in leaves (Figure 2). This is consistent with other plant species that increase ABA production in response to salinity.31 Moreover, ABA levels varied among the flower tissues