Abstract
Gibberellic acid (GA 3), exogenously supplied to the roots of water hyacinth, exerts significant effects on the pattern of development of clones. The effects are manifested as: (1) a general release in apical dominance which results in a significant increase in branching of the parental rhizome and its daughter rosettes, and (2) a change in pattern of leaf morphogenesis from a ‘float’ to ‘canopy’ form, as measured by length/width ratio of petioles. The effects, at least at low concentration of GA 3 (0.01–0.52 ppm GA 3), mimic the growth responses of plants in populations undergoing increase in population density. Growth responses obtained at higher concentrations of GA 3 (> 0.05 ppm GA 3) include higher rates of production of inflorescences and daughter rosettes which are not observed in natural populations. These observations suggest that biologically active concentrations of exogenous GA 3 are less than 0.05 ppm.
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