Phototrophism. First investigated by Charles and Frances Darwin (1881) canary grass Phalaris canariensis L . The Power of Movement in Plants (1881) Seedlings coleoptile plumules. Phototrophism. Phototrophism - Darwins’ Experiment . Conclusion :
a neoplasic growth due to infection by Agrobacterium tumifaciens.
A. tumifaciens carries the genes for production of cytokinin and auxins on a plasmid. Plasmid genes become a part of host cell genome.