Resumen
In order to obtain flowering, different applications of chemicals on plants were tested by several researchers. Substances that were tested were, amongst others, auxin, gibberellin, cytokinin, abscisic acid, prostaglandin; melatonin. All had an effect on flowering. With the aid of molecular-genetic research it was established that the product of certain genes, namely CONSTANS (CO) and FLOWERING LOCUS T (FT) could be the flowering stimulus. It could be a peptide or mRNA.