Figure 2.

Pigment contents and chlorophyll fluorescence of 4‐week‐old plants. (a–e) Chlorophyll a (a), chlorophyll b (b), total chlorophyll (c), chlorophyll a/b ratio (d), carotenoid (e), and F_v/F_m (f) of 4‐week‐old plants. Chlorophyll and carotenoid were extracted and determined as described by Wellburn (1994). Measurements of chlorophyll fluorescence parameters were performed with the IMAGING‐PAM M‐Series chlorophyll fluorescence system (Heinz Waltz) on dark‐adapted plants. Data are presented as means ± SE (n = 5 for pigment contents and n = 4 for chlorophyll fluorescence parameters). Values not connected by the same uppercase letters are significantly different (Student's t test, p < .05). Plants used for pigment extraction and fluorescence analysis were grown on a 12‐hr light/12‐hr dark photoperiod with an irradiance of 150 μmol photons/m⁻² s⁻¹ during the light period. Chl, chlorophyll. Car, carotenoid. FW, fresh weight. WT, wild type