role of cytokinins in the development and metabolism of barley leaves. i. the effect of cytokinins on leaf senescence

The loss of chlorophyll during dark-induced ageing of barley leaves was prevented to a similar extent by kinetin and the natural cytokinin, 6-Δ2-iso-pentenylarninopurine (2iP). A concentration of 400 μM appeared to be optimal in both cases. In the presence of 2iP the structure of mesophyll cells in...

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Bibliographic Details
Published inActa Societatis Botanicorum Poloniae Vol. 46; no. 2; pp. 357 - 368
Main Authors Wozny, A, Legocka, J, Szweykowska, A
Format Journal Article
LanguageEnglish
Published Warsaw Polish Botanical Society 1977
Subjects
Chlorophyll
Cytokinins
field crops
Kinetin
Leaves
Mesophyll
plant biochemistry
plant physiology
Senescence
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Summary:The loss of chlorophyll during dark-induced ageing of barley leaves was prevented to a similar extent by kinetin and the natural cytokinin, 6-Δ2-iso-pentenylarninopurine (2iP). A concentration of 400 μM 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 has been found between the retardation by 2iP of the chlorophyll loss, the rate of S2P-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 de-gradation in the cytokinin action in barley leaf senescence will be subjected to future experiments.
ISSN:0001-6977
2083-9480
DOI:10.5586/asbp.1977.028