Cold-hardening results in increased activity of enzymes involved in carbon metabolism in leaves of winter rye (Secale cereale L.) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1995-02

AUTHORS

Vaughan M. Hurry, Olav Keerberg, Tiit Pärnik, Per Gardeström, Gunnar Öquist

ABSTRACT

Light- and CO2-saturated photosynthesis of nonhardened rye (Secale cereale L. cv. Musketeer) was reduced from 18.10 to 7.17 μmol O2·m−2·s−1 when leaves were transferred from 20 to 5°C for 30 min. Following cold-hardening at 5°C for ten weeks, photosynthesis recovered to 15.05 μmol O2·m−2·s−1,comparable to the nonhardened rate at 20°C. Recovery of photosynthesis was associated with increases in the total activity and activation of enzymes of the photosynthetic carbon-reduction cycle and of sucrose synthesis. The total hexose-phosphate pool increase by 30% and 120% for nonhardened and cold-hardened leaves respectively when measured at 5°C. The large increase in esterified phosphate in coldhardened leaves occurred without a limitation in inorganic phosphate supply. In contrast, the much smaller increase in esterified phosphate in nonhardened leaves was associated with an inhibition of ribulose-1,5-bisphosphate carboxylase/oxygenase and sucrose-phosphate synthase activation. It is suggested that the large increases in hexose phosphates in cold-hardened leaves compensates for the higher substrate threshold concentrations needed for enzyme activation at low temperatures. High substrate concentrations could also compensate for the kinetic limitations imposed by product inhibition from the accumulation of sucrose at 5°C. Nonhardened leaves appear to be unable to compensate in this fashion due to an inadequate supply of inorganic phosphate. More... »

PAGES

554-562

Journal

TITLE

Planta

ISSUE

4

VOLUME

195

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00195715

DOI

http://dx.doi.org/10.1007/bf00195715

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010889962


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