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Effects of higher temperature on nectar production in Borago officinalis. (a,b) Nectar volume per flower (N = 178); (c,d) sugar concentration of nectar; and (e,f) total amount of nectar sugar (N = 173 for c–f) at the various flower developmental stages of plants grown at 21 °C (a,c,e) or 26 °C (b,d,f). Data are presented as means ± standard errors (SEs) as boxplots and with raw data points included in light gray.
