Table 2. Contents of metal elements in red outer-petal and yellow inner-petal during the flower development (μg g⁻¹ DW).

metal elements	S1		S2		S3		S4
	outer-petal	inner-petal	outer-petal	inner-petal	outer-petal	inner-petal	outer-petal	inner-petal
K	19,935.00 ± 95.00	11,550.00 ± 10.00	18,960.00 ± 20.00	11,450.00 ± 50.00	20,465.00 ± 125.00	12,105.00 ± 115.00	20,135.00 ± 75.00	13,870.00 ± 110.00
Ca	2,306.00 ± 5.00	5,225.50 ± 94.50	2,082.00 ± 29.00	5,692.50 ± 1.50	2,267.00 ± 10.00	5,571.50 ± 72.50	3,312.50 ± 20.50	8,004.50 ± 47.50
Mg	1,651.50 ± 12.50	2,441.50 ± 10.50	1,562.50 ± 7.50	2,466.50 ± 12.50	1,673.00 ± 6.00	2,466.00 ± 4.00	1,740.50 ± 7.50	2,859.00 ± 15.00
Fe	55.90 ± 3.60	51.00 ± 0.50	59.85 ± 0.05	108.20 ± 1.40	65.10 ± 1.80	53.35 ± 0.65	150.90 ± 1.90	89.65 ± 2.05
Mn	7.65 ± 0.05	13.90 ± 0.20	7.85 ± 0.25	14.90 ± 0.20	8.10 ± 0.20	13.10 ± 0.00	10.85 ± 0.25	18.00 ± 0.40
Zn	35.45 ± 0.15	43.70 ± 0.10	35.65 ± 0.05	45.30 ± 1.30	39.90 ± 1.50	42.90 ± 0.30	40.70 ± 0.60	56.80 ± 0.10
Cu	9.85 ± 0.05	12.60 ± 0.60	10.60 ± 0.70	13.50 ± 0.10	11.25 ± 1.25	11.90 ± 0.40	12.95 ± 0.15	14.85 ± 0.05
Mo	0.45 ± 0.05	0.30 ± 0.10	0.55 ± 0.05	1.15 ± 0.15	0.35 ± 0.05	0.35 ± 0.05	0.25 ± 0.05	0.20 ± 0.00
Al	23.55 ± 0.65	30.10 ± 10.30	38.75 ± 0.75	23.85 ± 3.05	34.65 ± 0.35	21.30 ± 3.00	123.70 ± 0.10	59.55 ± 1.45
Na	21.15 ± 0.00	12.75 ± 0.00	26.25 ± 0.00	105.60 ± 0.00	36.45 ± 0.00	73.80 ± 0.00	38.25 ± 0.00	60.85 ± 0.00
Ni	1.75 ± 0.05	2.50 ± 0.10	3.55 ± 0.05	11.85 ± 0.25	2.45 ± 0.35	1.85 ± 0.15	—	—
Cr	6.10 ± 0.10	5.85 ± 0.45	5.65 ± 0.45	5.65 ± 0.45	5.45 ± 0.35	4.85 ± 1.05	5.50 ± 0.50	4.45 ± 0.15
Pb	—	—	—	—	—	—	—	—

S1: Stage 1, flower-bud stage; S2: Stage 2, initiating bloom; S3: Stage 3, bloom stage; S4: Stage 4, wither stage. — not detected.