Figure 2.

Effects of the Photoperiod on Plant Development and Spike-Related Traits of Scarlett and S42-IL107.

Plants of Scarlett (black) and S42-IL107 (white) were grown under SD or LD conditions. At different stages of MSA development (W0.5-W10), plants were transferred from LDs to SDs (left column) or from SDs to LDs (right column) and remained in the respective photoperiod until plant senescence. The following phenotypes of the main shoot were recorded: heading date ([A] and [B]), seed number per spike ([C] and [D]), and leaf blade length of leaf 6 ([E] and [F]). The bars represent the means ± sd over three plants. Significant differences (P < 0.05) between genotypes transferred from SDs to LDs and vice versa at the same developmental stage are indicated by asterisks above bar graphs. Aborted and developed main shoot spikes of Scarlett grown under SDs ([G], left) or LDs ([H], left), respectively. The carpels and stamen of main shoot spikes of Scarlett grown under LDs ([H], right) or transferred from LDs to SDs ([G], right) at Waddington stage 8.0 (see also [C]).