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. 2020 May 22;10(5):214. doi: 10.3390/metabo10050214

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Sugar and amino acids profiles of Nicotiana nectars categorized by the preferred pollinator and time of flowering. (A) Sum of total sugar content highlighting the contributions of the three main sugars, sucrose, glucose and fructose. The numbers beside each data-bar is the sucrose: hexose molar ratio (closest to the data-bar) and the fructose: glucose ratio (furthest from data-bar). (B) Sum of total amino acid content in nectar categorized as nonproteinaceous, essential, and nonessential amino acids. Error bars represent the standard error, from 18 to 48 replicates depending on pollinator or flowering time.