Fig. 2.

Heat tolerance (LT₅₀ °C) of vegetative shoots (black bars) and of reproductive shoots (gray bars). Data for the species were pooled and grouped by different reproductive stages (a), different growth forms (b) and different mountain vegetation zones (c). Box plots show the median (horizontal line inside box), the 25th and 75th percentile (top and bottom of box), maximum and minimum values within the normal range (whiskers) and outliers (circles). Different letters within subfigures indicate statistical differences among different groups for vegetative shoots (uppercase letters) and for reproductive shoots (lowercase letters) by one-way ANOVA. Mean values of LT₅₀ are significantly different between reproductive and vegetative shoots in all groups (P ≤ 0.001, t test)