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Following a study of the relationship between cytokinin oxidase/dehydrogenase (CKX) and senescence in darkened barley leaf segments, we have now investigated the influence of light on the in vitro activity of CKX. Seedlings of Hordeum vulgare L. were grown for 8d under a light/dark regime of 18h white light and 6h darkness. Then apical parts of 7cm length were cut from the first foliage leaves and...
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