Photosynthetic pigment content in antioxidant mutants. A, Total chlorophyll in leaves was measured spectrophotometrically. The numbers indicate the chlorophyll a to chlorophyll b ratio. B, The content of neoxanthin, lutein, β-carotene, and xanthophyll cycle components (violaxanthin, antheraxanthin, zeaxanthin; V+A+Z) in leaves was determined by HPLC analysis. Data represent the mean and se of at least five experiments. Asterisk, white circle, or black circle indicates significantly different as compared to wild type, vte1 or cad2, respectively, after t test analysis (P < 0.05).