Effects and interactions of gibberellic acid and cytokinins on the retention of chlorophyll and phosphate in barley leaf segments

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Abstract
In leaf segments of barley (Hordeum vulgare L. cv. Mozoncillo), the cytokinin specificity for retarding the loss of phosphate is different from that of retarding the loss of chlorophyll. Some cytokinins require the simultaneous application of gibberellins to delay the loss of phosphate. Although both chlorophyll and phosphate losses occur in senescence, they are apparently controlled by cytokinins through different mechanisms.