Figure 5.

Time-course changes in chlorophyll a fluorescence of B. juncea 1st and 3rd leaves in response to A. brassicicola infection. Plants were grown and infected under different day-length regimes simultaneously. The mean values ± SE were obtained from three independent experiments (n = 3). Different letters indicate a significant difference between the means within a photoperiod according to a post-hoc Duncan’s test (p < 0.05). Abbreviations: 1st L, first leaf; 3rd L, third leaf; F₀, minimum fluorescence; F_m, maximum fluorescence; F_v/F_m, maximum quantum yield of PSII; NPQ, non-photochemical quenching; Rfd, fluorescence decline ratio; qP, photochemical quenching; qL, fraction of PSII open centers.