Fig. 4

Proline concertation in leaves, A) petals B), s–s + s C), and ovary D) of Hiscus rosa-sinensis L. cultivars, ‘Porto’ or ‘Sunny wind’. Data are shown as mean with at least 5 independent biological replicates and error bars indicate standard error. Data were subjected to two-way ANOVA and differences among means were determined using Tukey’s post-test. Different letters indicate statistical differences for p < 0.05