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© 1992 Oxford University Press

RESEARCH-ARTICLE

Phosphoenolpyruvate Carboxylase and CarbonEconomy of Apple Seedlings

M M. BLANKE1 and G. EBERT 2

Institut fuuml;r Obstbau und Gemuuml;sebau der Universitat Bonn Aul dem Hugel 6, D–5300 Bonn Germany

1To whom correspondence should be addressed.

Seeds of apple cv. Golden Delicious were germinated and cultivated in the greenhouse until the third leaf emerged. Respiration ofgerminating seeds or photosynthesis of the first leaves was measured by infra-red gas analysis and porometry, respectively. To study the role of phosphoenolpyruvate carboxylase (PEPC), the dominant carboxylase in the carbon economy, its CO2 refixationpotential was related to the amount of CO2 lost in respiration. With a range of 0.2 (dry seeds) to 18 (cotyledons) µmol CO2 h–1 g–1 PEPC activity resembled or exceeded the amount of C02 lost in respiration before the third leaf developed. It is concludedthat PEPC largely contributes to economize the carbon metabolism of apple seedlings before they become photosynthetically competent.

Key words: Apple (Malus pumila Mill.) seedling, carbon economy, phosphoenolpyruvate carboxylase, photosynthesis, respiration


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