Abstract
ABSTRACT The δ 13C values found in the dry matter of nectar and tissues of the CAM species Kalanchoe daigremontiana, Aloe eru and Sansevieria sp. and the C3 species Abutilon striatum were well within the typical ranges known for these types of plants. In K. daigremontiana there was a strong nectar-secretion rhythm with an approx. 5-fold (volume basis) or 4-fold (sugar basis) greater secretion during the light period than during the dark period. There was no rhythm in the δ 13C value of nectar, and water stress tending to eliminate direct CO2 fixation by ribulose-bis-phosphate-carboxylase in CAM plants had no effect. This indicates that in the above species nectar is not supplied directly with newly assimilated carbon and that there is internal mixing of carbon pools prior to sugar secretion. In K. daigremontiana there was no difference in δ 13C values of nectar and leaves. In Sansevieria, A. eru and A. striatum the nectar was relatively richer in 13C, suggesting that isotope effects may occur during the s...
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