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ISOTOPE RATIOS (δ13C AND δD) OF NECTAR IN COMPARISON TO TISSUES IN C3 AND CAM PLANTS

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The δ 13C values found in the dry matter of nectar and tissues of the CAM species Kalanchoë daigremontiana, Aloë 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 secretion process. It could also be explained by the absence of lipids, which are normally rather poor in 13C, from the nectar. Tissue dry matter was much poorer in D than nectar dry matter. This may again be due to absence of lipids poor in the heavier isotope from the nectar. It can also be explained by particularly high, unhindered evaporation from the nectar tending to leave behind D-rich water which could exchange D for H in -OH and -NH2 groups of organic compounds. Higher evaporation during the light period was responsible for a pronounced day-night rhythm of 5D values in the nectar of K. daigremontiana.

Affiliations: 1: Institut für Botanik der Technischen Hochschule Darmstadt ; 2: Institut für Radiohydrometrie der Gesellschaft für Strahlen- und Umweltforschung mbH ; 3: Botanisches Institut der Technischen Universität München

10.1080/0021213X.1985.10677015
/content/journals/10.1080/0021213x.1985.10677015
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/content/journals/10.1080/0021213x.1985.10677015
1985-05-13
2018-09-24

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