of in vitro bud regeneration: A comparative study of the interaction between light and IAA in a wild type and an aurea mutant of Lycopersicon esculentum lo the presence of 0.2 (jiAf IAA both the wild type and the aurea. nntitant of Lycopersicon esculentum Mill, showed a low but signiftcant percentage of bud fonnation in the dark, whereas no bud fonnation occurred in the dark when 20 ^>M IAA was present in the tnedium. In both systems blue light always showed a strong promoting effect on bud regeneration, both as final percentage of i^generation and by shortening the initial lag period, suggestitig the action of a specific blue light photoreceptor. Red and far-red light increased the percentage of bud differentiation in wild type explants, with both the IAA concentrations. In the aurea mutant only red at the lowest IAA concentration had such an effect. The final percentage of bud regeneration under red light was greater or equal to that found under blue light in the wild type as well as in the aurea mutant esplants cultured in the presence of the lowest IAA concentration.

No abstract