SUMMARY Endogenous cytokinin activity in leaves and buds of Xanthium strumarium L. (as estimated by the soybean callus bioassay) declined by about 80% during the 24 h following detachment from the plant. The decline in activity was little influenced by the photoperiod to which the detached organs were exposed. When zeatin was supplied to detached leaves it underwent rapid metabolism. The main cytokinin‐active metabolite, which was readily detectable an hour after the start of zeatin uptake, eluted from a Sephadex LH20 column with the same elution volume as zeatin riboside. Substantial differences due to photoperiod, in either the rate or the pattern of zeatin metabolism, were not detected.
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Henson et al. (1977) studied this question.