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. 2018 Jul 30;9:1100. doi: 10.3389/fpls.2018.01100

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Copyright © 2018 Silva, Guirgis and Thornburg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Carbohydrate composition of selected tobacco species. Proportions of fructose (F), glucose (G), and sucrose (S) in nectar. The area of each circle represents the total mass of sugar found in each nectar sample. Each segment represents the mean of three samples. Averages ± standard deviation (N = 3). All characteristics of each nectar are present in Table 3. Group 1, total nectar carbohydrate < 560 mM, Group 2, total nectar carbohydrate > 1000 mM.