Figure 6.

Effects of acute drought stress on chlorophyll fluorescence parameters of the leaves of different peanut cultivars. (A) Ratio of maximum light quantum efficiency (Fv/Fm) of L3 leaves from HY22 and FH18 (h). (B) Non-photochemical burst coefficient (NPQ) of L3 leaves from HY22 and FH18 (h). (C) Variable fluorescence decline (Rfd) in L3 leaves from HY22 and FH18 (h). Data are shown for each panel after 0, 9, and 12 h of drought treatment. Values are means of three replicates; bars indicate ± standard error; and letters indicate significant differences between HY22 and FH18 via analysis of variance (ANOVA; the letters in the graph were significant at the 0.05 level of significance, with significant differences between letters in the same treatment time). “HY22” refers to the drought-tolerant cultivar Huayu 22, and “FH18” to the drought-sensitive cultivar Fuhua 18.