Photosynthetica 2002, 40(1):63-69 | DOI: 10.1023/A:1020142223930

The Pattern of Changes in Photosynthetic Apparatus in Response to Cold Acclimation and De-acclimation in Two Contrasting Cultivars of Oilseed Rape

M. Rapacz1, K. Hura1
1 Department of Plant Physiology, Faculty of Agriculture, Agricultural University of Kraków, Kraków, Poland

In spring and winter cultivars of oilseed rape (Brassica napus var. oleifera), acclimation of photosynthetic apparatus to cold was connected with the increase in activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) and sucrose-phosphate synthase (SPS). Conversely, cold de-acclimation entailed the decline of RuBPCO and SPS activities. The rate of this photosynthetic de-acclimation might depend on day temperature. On the other hand, temperature rise during de-acclimation (identical during the day and night) resulted in the improvement of photosynthetic activity measured by means of chlorophyll fluorescence. An increase in SPS activity (and even transitory increase in RuBPCO activity) was observed when the elongation growth rate (EGR) accelerated during de-acclimation. Throughout re-acclimation, plants with high EGR were unable to maintain or recover higher photosynthetic capacity, despite the fact that SPS activity remained high or even increased during re-acclimation.

Additional key words: Brassica napus var. oleifera; carbon metabolism; chlorophyll fluorescence; cultivar differences; elongation growth rate; low temperature; photosynthesis; ribulose-1,5-bisphosphate carboxylase, oxygenase; sucrose-phosphate synthase

Published: March 1, 2002  Show citation

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Rapacz, M., & Hura, K. (2002). The Pattern of Changes in Photosynthetic Apparatus in Response to Cold Acclimation and De-acclimation in Two Contrasting Cultivars of Oilseed Rape. Photosynthetica, 40(1), 63-69. doi: 10.1023/A:1020142223930
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