Fig. 4From: EMS-induced mutagenesis in Choy sum (Brassica chinensis var. parachinensis) and selection for low light tolerance using abiotic stress indicesThe change of chlorophyll content and leaf nitrate levels under light and shade. Five Choy Sum mutants and wild-type plants were used to quantify chlorophyll-a (A), chlorophyll-b (B), total chlorophyll (C), the ratio of chlorophyll a/b (D), and leaf nitrate content (E). Bars represent mean ± standard error (SEn = 6). The mean marked with different letters indicate significant differences between treatments p < 0.05, as determined with HSD testBack to article page