Abstract
Summary The pattern of dark carbon dioxide fixation in embryos, suspensors and haustoria of Tropaeolum majus in different stages of development (globular, heart and cotyledonary) is studied. A comparison is also made between PEP-carboxylase activity and 14CO2 incorporation in embryo, suspensor and haustoria. Phosphoenol-pyruvate carboxylase activity is correlated with the faculty of the young embryos (globular and heart-shaped) and its suspensor cells to fix CO2 by non-photosynthetic mechanisms. The present data provide biochemical evidence in characterizing physiological function of the suspensor in early embryogenesis (synthesis and transfer). Haustoria possibly acted as “transfer cells”.
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