Alleviation of Lead Toxicity by 5-Aminolevulinic Acid Is Related to Elevated Growth, Photosynthesis, and Suppressed Ultrastructural Damages in Oilseed Rape

Table 3

Effects of treatments of 5-aminolevulinic acid (ALA) (mg L⁻¹) and lead (Pb) (μM) on chlorophyll and carotenoids contents (mg g⁻¹ FW) in the leaves of Brassica napus cv. ZS 758.

ALA conc.	Pb conc.	Mean values and their relative increase/decrease over respective controls
		Chlorophyll a	Chlorophyll b	Total chlorophyll	Carotenoids
0	0	47.92±2.56^a (0)	58.54±1.64^b (0)	106.47±1.87^b (0)	4.89±0.81^ab (0)
	100	44.45±1.98^a (−7.24)	58.31±1.51^b (−0.39)	102.76±3.50^b (−3.74)	4.87±0.59^abc (0)
	400	34.20±1.94^b (−28.63)	47.50±1.88^d (−18.85)	81.71±1.11^d (−23.25)	3.54±0.37^c (−27.31)
25	0	47.48±2.25^a (−0.91)	64.93±1.76^a (+10.91)	112.42±4.01^a (+5.58)	5.43±0.60^a (+11.49)
	100	45.23±2.35^a (+1.75)	61.40±1.71^b (+5.31)	106.64±4.06^b (+3.77)	4.92±0.48^ab (+1.02)
	400	37.63±2.27^b (+10.02)	53.73±1.75^c (+13.11)	91.42±2.89^c (+11.88)	3.95±0.42^bc (+11.58)

Values are the means of four replications ± SD. Variants are significant at 𝑃≤0.05.