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Siliqua development was studied in the wild type line Landsberg erecta and the GA‐sensitive mutant ga‐1 of Arabidopsis thaliana (L.) Heynh. Reciprocal crosses between wild type and ga‐l mutant, and self pollinations of either parent have shown that siliqua growth is determined by endogenous GAs originating from maternal tissues and embryo. The ga‐1 mutant either self pollinated or cross‐pollinated with wild type pollen showed reduced siliqua growth, which to a large extent could be overcome by exogenously applied GAs. The siliquae of the ga‐1 mutant possessed very reduced ent‐kaurene synthesizing capacity and no detectable endogenous GA‐activity indicating an early block in the GA‐biosynthetic pathway. Seed weight is not affected by GA‐deficiency during development.
Barendse et al. (1986) studied this question.