Fig. 3. Path analysis diagram for light quality and physiological variables of Epilobium hirsutum. The dotted and solid arrows mean the standardized regression coefficients are negative and positive values respectively. B:R: amount of blue light per red light; W: amount of white light per red light; ΔT: difference between leaf and air temperatures; Ci: intercellular CO2 pressure; E: transpiration rate; Pn: net photosynthetic rate; Φ: photosynthetic quantum efficiency on the incident light. All regressions have significant differences, p ≤ 0.05. The weighted lines of the arrow mean standardized regression coefficient, |β| ≥ 0.5. The photosynthetic rate also may correlate with morphological responses such as leaf or stem.
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