Table 2 Regression between ionic contents (Na⁺ and K⁺) in shoot and root of guava plant (Psidium Guajava L.), and stress tolerance against salinity and water stress treatments.

Parameters	Regression	Coefficient of correlation (R)	Adjusted regression coefficient (Adj.R²)	Significance
K⁺/Na⁺ (shoot) vs. shoot dry weight	y = 47.20^{−exp(−1.31x)}	0.990	0.980	********
K⁺/Na⁺ (root) vs. root dry weight	y = 1.911x + 3.000	0.865	0.732	********
K⁺/Na⁺ vs. chlorophyll content (leaf)	y = 5.105x + 12.26	0.836	0.825	********
K⁺/Na⁺ vs. chlorophyll content (stem)	y = 3.533x + 10.93	0.923	0.842	********
K⁺/Na⁺ vs. chlorophyll content (root)	y = 2.735x + 8.931	0.964	0.925	********
K⁺/Na⁺ vs. photosynthetic rate (leaf)	y = 1.940x + 3.063	0.938	0.872	********
K⁺/Na⁺ vs. photosynthetic rate (stem)	y = 1.401x + 2.454	0.985	0.968	********
K⁺/Na⁺ vs. photosynthetic rate (root)	y = 1.014x + 1.874	0.964	0.925	********
K⁺/Na⁺ vs. transpiration rate (leaf)	y = 0.316x + 0.924	0.861	0.724	********
K⁺/Na⁺ vs. transpiration rate (stem)	y = 0.238x + 0.808	0.936	0.868	********
K⁺/Na⁺ vs. transpiration rate (root)	y = 0.173x + 0.708	0.914	0.826	********
K⁺/Na⁺ vs. stomatal conductance (leaf)	y = 0.170x + 0.032	0.991	0.981	********
K⁺/Na⁺ vs. stomatal conductance (stem)	y = 0.118x–0.012	0.992	0.980	********
K⁺/Na⁺ vs. stomatal conductance (root)	y = 0.086x–0.065	0.986	0.970	********

Na⁺ and K⁺ denote sodium and potassium, respectively. Results are significant at p ≤ 0.0001 represented by ****y. All regressions are based on first order kinetics equation (y = bx + a) where “a” is the intercept, and “b” is the slope value for the regression except regression between K⁺/Na⁺ (shoot) and shoot dry weight is based on exponential model (y = a^−exp(bx)).

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