Figure 1.

Differential fertility of Arabidopsis thaliana Col-0 and Ler rga gai mutants. (a–c) Primary inflorescences showing silique set of wild-type Col-0 under (a) control growth conditions and (b) 100 µM GA₃ treatment, and (c) rga-28 gai-td1 (Col-0). White arrowheads indicate infertile silique positions. (d) Mean number of seeds per silique (n = 36, ± SE) under control conditions and GA₃ treatment. Letters indicate significant difference (P < 0.01) of a genotype within a single GA treatment from control wild-type (black) and GA-treated wild-type (grey), respectively. Genotypes marked with different letters are significantly different from one another. Asterisks indicate significant difference (P < 0.01) between GA treatments within the same genotype. Pairwise comparisons were made using 1% least significant differences (LSDs) on a log-transformed scale (8.782 on 121 df between genotypes, 9.717 on 71 df between GA treatments). (e, f) Mean frequency of successful silique set on the primary inflorescence (n = 12, ± SE) of wild-type and rga gai mutant genotypes in Col-0 (e) and Ler (f) under control growth conditions and GA treatment.