although the first experiments on the feeding of carnivorous plants took place at the time of darwin , it has up to now been proved unambiguously only for drosera and utricularia that the development of the plants is furthered by the prey of their leaves.in the present work , pinguicula lusitanica in axenic agar culture showed significantly increased leaf development , more chlorophyll content and a greater number of flowers in response to feeding with drosophila , egg yolk and ammonium phosphate .
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