Characterisation of the procera mutant of tomato and the interaction of gibberellins with end-of-day far-red light treatments

The tomato (Solanum lycopersicum L.) slender mutant procera (pro)) was anal ysed for its relationship with gibberellin (GA) by combining it with GA def iciency due to the gib-1 mutation, The sensitivity to GA biosynthesis inhib itors and the GA content were measured in the pro gib-1 double mutant. In t he gib-1 mutant background, the pro mutation strongly reduced the GA requir ement for seed germination and stem growth and almost fully restored the mo rphological leaf defects of the gib-1 mutant. An end-of-day far-red light t reatment, when applied to the various genotypes, indicated that GAs are req uired for a response to this treatment, but that it act independently of th e Pro gene product.