Fig. 4

Average apical bud size resulting from various lengths of SD (short day) treatment (11 h light; 13 h night) for seedlings grown indoors and outdoors. Measurements were performed on January 24, 2014 and classified into five different categories (1 = ≤1.0 mm, 2 = 1.1–2.0 mm, 3 = 2.1–3.0 mm, 4 = 3.1–4.0 mm, 5 = 4.1–5.0 mm). Total number of seedlings in each treatment =44, n = 4 (each replicate contains 11 seedlings). Data were analyzed independently for the indoor- and outdoor-growth environments and different letters indicate significant differences among treatments at p ≤ 0.05, according to Tukey’s test. Vertical lines represent the standard error