Abstract
Abstract The growth of excised grape shoots in the absence of roots was investigated using asceptic culture. Sustained shoot development was observed only when cytokinins were present in the media. We used ‘Concord’ (Vitis labruscana Bailey) in most experiments, but the response was observed in other cultivars including those of Vitis vinifera L. Better response was obtained with cytokinin ribosides than with free bases. If roots developed, the requirement for an exogenous source of cytokinin was nullified.
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