Table 1. Changes in nitrogen content of epidermal and mesophyll cell tissues per petal from flower opening to senescence.

	Epidermal	Mesophyll
Day 0	20.4 ± 1.5 a	235.5 ± 6.8 a
Day 4	24.0 ± 1.4 a	226.4 ± 0.9 a
Day 7	16.8 ± 2.4 a	170.6 ± 6.3 b

Central bundles and the bottom part of each petal were excluded from samples. Means with different letters are significantly different in each tissue (Tukey test, p < 0.01). Each data point represents the mean ± S.E. (n = 3).