Senescence and protein degradation in leaf segments of young winter wheat - Influence of lead age

Fischer, Andreas; Feller, Urs (1994). Senescence and protein degradation in leaf segments of young winter wheat - Influence of lead age. Journal of Experimental Botany, 45(1), pp. 103-109. Oxford University Press 10.1093/jxb/45.1.103

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Leaf senescence in intact wheat plants can be strongly influenced by altered source/sink relations. Interactions with other plant parts are no longer possible in detached leaves and therefore differences in their senescence behaviour reflect the physiological status of the leaf before cutting. the net degradation of chlorophylls and of selected enzyme proteins (detected by SDS-PAGE and immunoblotting) was delayed in detached young leaves as compared to senescing or mature leaves excised from the same field-grown wheat plants. The physiological leaf age was therefore decisive for the velocity of artificial senescence. Net degradation rates of the enzymes investigated varied in detached leaves. The protein quantities of plastidial glutamine synthetase, phosphoribulokinase and phosphoglycolate phosphatase decreased more rapidly than those of ferredoxin-dependent glutamate synthase and nitrite reductase. Differences were also detected between two enzymes involved in the same metabolic pathway (photorespiratory carbon cycle) but located in different subcellular compartments: the plastidial enzyme phosphoglycolate phosphatase was lost more rapidly than glycolate oxidase (peroxisomal enzyme).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant nutrition [discontinued]
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Feller, Urs

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0022-0957

Publisher:

Oxford University Press

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

04 Jul 2017 16:28

Last Modified:

22 Oct 2019 22:34

Publisher DOI:

10.1093/jxb/45.1.103

Uncontrolled Keywords:

detached leaves, senescence, proteolysis, leaf age, wheat

BORIS DOI:

10.7892/boris.91891

URI:

https://boris.unibe.ch/id/eprint/91891

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