Seasonal Changes in the Pattern of Assimilatory Enzymes and of Proteolytic Activities in Leaves of Juvenile Ivy

Fischer, Andreas; Feller, Urs (1994). Seasonal Changes in the Pattern of Assimilatory Enzymes and of Proteolytic Activities in Leaves of Juvenile Ivy. Annals of Botany, 74(4), pp. 389-396. Oxford University Press 10.1006/anbo.1994.1132

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Ivy growing under natural conditions is an interesting plant to study the influence of external (e.g. temperature, light) and internal (e.g. source/sink relations) factors on leaf metabolism. Leaves of this evergreen plant are subject several times to seasonal changes. The contents of selected assimilatory enzymes were well conserved throughout the winter indicating that ivy leaves are probably able to make use of short periods with higher temperatures and to immediately restart growth in spring. Total proteins and carbohydrates increased considerably between February and May before the emergence of the new leaf generation. The increase in the content of non-structural carbohydrates was due to the accumulation of starch, while soluble sugars peaked in winter and decreased in spring. From May onwards, the assimilates were retranslocated to the emerging young plant parts. Marked seasonal changes in the peptide hydrolase pattern were observed. All exo- and endopeptidases investigated were minimal during summer suggesting that the net protein remobilization from older leaves was not based on an increase in the level of these major peptide hydrolases. Source/sink interactions on a whole plant level seem to be decisive in the regulation of seasonal changes in the pattern of assimilatory enzymes and of proteolytic activities. Since ivy leaves remain active for several years, the changes must be reversible and occur repeatedly during the life-span of a particular leaf.

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:

0305-7364

Publisher:

Oxford University Press

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

07 Mar 2017 08:51

Last Modified:

18 May 2017 10:41

Publisher DOI:

10.1006/anbo.1994.1132

Uncontrolled Keywords:

Hedera helix L., ivy, peptide hydrolase, assimilatory enzyme, low temperatures, retranslocation

URI:

https://boris.unibe.ch/id/eprint/91885

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