The reaction norms of the non-saline and coastal ecotypes of Ipomoea cairica on the functional traits according to the saline treatment levels.

NS, non-saline treatment; SA, saline treatment. SLA, specific leaf area; WUE, water use efficiency; Amax, maximum photosynthetic rate; ΦCO2, apparent quantum yield for CO2 assimilation; SC, stomatal conductance (mmol m-2 s-1); TR, transpiration rate (mmol m-2 s-1). The P-value reflects the statistical significance of the difference in reaction norm between two ecotypes, which was represented by the interaction of the saline treatment with ecotype (Table 4). Data for SC and TR were log10-transformed to ensure the normality of the data. Values presented are means ± SE. Means with the same letter were not significantly different (P