Retardation of radish raphanus sativus var radicola cultivar giant butter leaf senescence by poly amines

Altman, A.

Physiologia Plantarum 54(2): 189-193

1982


ISSN/ISBN: 0031-9317
DOI: 10.1111/j.1399-3054.1982.tb06324.x
Accession: 006333884

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Abstract
The effect of polyamines and related metabolites on several parameters of leaf senescence was followed in detached radish (R. sativus L. var radicola cv. Giant Butter) leaves floated on test solutions in darkness. Leaf senescence was accompanied by a marked loss of chlorophyll, which started at 24-48 h of incubation. The polyamines, spermine and spermidine, and the diamines, putrescine and cadaverine, were highly effective in arresting chlorophyll loss over a period of at least 96 h. L-arginine, and especially L-ornithine, were less active. Polyamines prevented the marked chlorophyll loss in the dark-incubated leaves, but did not compensate for the moderate chlorophyll loss when the leaves were aged in light. Polyamines were highly effective in retarding earlier events of leaf senescence, prior to chlorophyll loss; protein degradation and RN activity were inhibited by spermidine. Chlorophyll and protein loss in dark- or light-incubated suspensions of either intact or disrupted chloroplasts was not affected by polyamines. Apparently, polyamines are highly effective in preventing chlorophyll loss from detached leaves, possibly by controlling early senescence-linked events which occur in darkness rather than by direct inhibition of chlorophyll degradation.

Retardation of radish raphanus sativus var radicola cultivar giant butter leaf senescence by poly amines