Table 2.

Correlations of photosynthetic parameters with each principal component (PC)Strongest correlations are indicated in red, with weakest correlations as white. Standard deviation, proportion of variance explained, and cumulative proportion of variance explained for each PC are given below. A _max, maximum photosynthetic CO₂ assimilation; J _max, maximum rate of electron transport demand for RuBP regeneration; V _cmax, maximum velocity of Rubisco for carboxylation; Carboxylation efficiency, the in vitro carboxylation efficiency of Rubisco; Rubisco content, Rubisco content of the flag leaf; V _c ^Rubisco, velocity of Rubisco for carboxylation in vitro; A ₄₀₀, CO₂ assimilation at ambient CO₂ concentration (400 µmol mol^–1 CO₂); R _d, day respiration rate; g _m, mesophyll conductance for CO₂ diffusion; C _i ⁴⁰⁰, internal CO₂ concentration at ambient CO₂ concentration (400 µmol mol^–1 CO₂); C _i ^max, internal CO₂ concentration at maximum photosynthetic CO₂ assimilation.