Cytokinins in Developing Tuberous Roots of Sweet Potato

Abstract

The presence and levels of 14 cytokinin species were determined in the developing tuberous roots of sweet potato by mass spectrometry using deuterium-labeled standards. The following structures were assigned: trans- and cis-zeatin, trans- and cis-ribosylzeatin, trans- and cis-glucosylzeatin, trans- and cis-2-methylthioribosylzeatin, dihydrozeatin riboside, N⁶-isopentenyladenine, N⁶-isopentenyladenosine, 9-glucosyl-N⁶-isopentenyladenine and trans- and cis-zeatin ribotide.