Effect of Disbudding on Root Cytokinin Export and Leaf Senescence in Tomato and Tobacco

Bud removal and decapitation (disbudding) of plants of tomato (Lycopersicon esculentum Miller) and tobacco (Nicotiana tabacum L.) resulted in an increase in both the concentration and the total flux of cytokinin in bleeding xylem sap. There was a retardation in the rate of chlorophyll loss from leav...

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Bibliographic Details
Published in:Journal of experimental botany 1981-02, Vol.32 (1), p.121-127
Main Authors: COLBERT, KATHERINE A., BEEVER, JESSICA E.
Format: Article
Language:English
Subjects:
Bleeding
Chlorophylls
Chloroplasts
Cytokinins
Disbudding
Leaf buds
Leaves
Plants
Sap
Xylem
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Summary:Bud removal and decapitation (disbudding) of plants of tomato (Lycopersicon esculentum Miller) and tobacco (Nicotiana tabacum L.) resulted in an increase in both the concentration and the total flux of cytokinin in bleeding xylem sap. There was a retardation in the rate of chlorophyll loss from leaves of disbudded plants of both species. Ultrastructural examination of the chloroplasts of disbudded tomato plants revealed a maintenance of chloroplast integrity, compared with chloroplasts from control plants. It is suggested that the delaying of leaf senescence observed in disbudded plants is due to an increased availability of cytokinin to these leaves.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/32.1.121