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Cyto kinins in xanthium strumarium the metabolism of cyto kinins in detached leaves and buds in relation to photoperiod



Cyto kinins in xanthium strumarium the metabolism of cyto kinins in detached leaves and buds in relation to photoperiod



New Phytologist 78(1): 27-33



Endogenous cytokinin activity in leaves and buds of X. strumarium (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 supported to detached leaves it underwent rapid metabolism. The main cytokinin-active metabolite, which was readily detectable an hour after the star 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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