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Cold hardening of spring and winter-wheat and rape results in differential-effects on growth, carbon metabolism, and carbohydrate content
Cooperative Research Centre for Plant Science, The Australian National University, Canberra ACT 2601, Australia.ORCID iD: 0000-0001-5151-5184
Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0001-5900-7395
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1995 (English)In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 109, no 2, 697-706 p.Article in journal (Refereed) Published
Abstract [en]

The effect of long-term (months) exposure to low temperature (5 degrees C) on growth, photosynthesis, and carbon metabolism was studied in spring and winter cultivars of wheat (Triticum aestivum) and rape (Brassica napus). Cold-grown winter rape and winter wheat maintained higher net assimilation rates and higher in situ CO2 exchange rates than the respective cold-grown spring cultivars. In particular, the relative growth rate of spring rape declined over time at low temperature, and this was associated with a 92% loss in in situ CO2 exchange rates. Associated with the high photosynthetic rates of cold-grown winter cultivars was a P-fold increase per unit of protein in both stromal and cytosolic fructose-1,6-bisphosphatase activity and a 1.5- to 2-fold increase in sucrose-phosphate synthase activity. Neither spring cultivar increased enzyme activity on a per unit of protein basis. We suggest that the recovery of photosynthetic capacity at low temperature and the regulation of enzymatic activity represent acclimation in winter cultivars. This allows these overwintering herbaceous annuals to maximize the production of sugars with possible cryoprotective function and to accumulate sufficient carbohydrate storage reserves to support basal metabolism and regrowth in the spring.

Place, publisher, year, edition, pages
1995. Vol. 109, no 2, 697-706 p.
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URN: urn:nbn:se:umu:diva-44675ISI: A1995RZ76800044OAI: oai:DiVA.org:umu-44675DiVA: diva2:433635
Available from: 2011-08-10 Created: 2011-06-09 Last updated: 2017-12-08Bibliographically approved

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Hurry, Vaughan M.Gardeström, PerÖquist, Gunnar

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