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The role of cyto kinins in the development and metabolism of barley leaves part 1 the effect of cyto kinins on leaf senescence



The role of cyto kinins in the development and metabolism of barley leaves part 1 the effect of cyto kinins on leaf senescence



Acta Societatis Botanicorum Poloniae 46(2): 357-368



The loss of chlorophyll during dark-induced aging of barley [Hordeum vulgare] leaves was prevented to a similar extent by kinetin and the natural cytokinin, 6-.DELTA.2-isopentenylaminopurine (2iP). A concentration of 400 .mu.M appeared to be optimal in both cases. In the presence of 2iP the structure of mesophyll cells in dark-incubated leaves was maintained unchanged. A distinct correlation was found between the retardation by 2iP of the chlorophyll loss, the rate of 32P-incorporation into nucleic acids and the maintaining of the RNase activity at a low level. The importance of the RNA synthesis and the rate of its degradation in the cytokinin action in barley leaf senescence will be subjected to future experiments.

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