Table 3 Internal organic acid anion concentrations in highbush blueberry cultivars under Al toxicity.

Cultivar	Roots			Leaves
Cultivar	0 h	24 h	48 h	0 h	24 h	48 h
Malate
Brigitta	8.61 ± 0.76Aa	4.481 ± 0.86Ab	5.161 ± 1.09Ab	17.00 ± 1.35Ab	21.04 ± 0.47 Aa	19.87 ± 1.66Ab
Star	5.341 ± 0.17Ba	2.211 ± 0.46Bb	1.411 ± 0.14Bc	17.80 ± 1.03Aa	20.70 ± 2.53 Aa	18.44 ± 0.01Aa
Duke	2.371 ± 0.17Ca	1.571 ± 0.33Bb	0.401 ± 0.40Bc	14.16 ± 1.47Aa	14.91 ± 0.35Ba	12.88 ± 0.57Ba
Camellia	1.981 ± 0.09Ca	2.371 ± 0.44Ba	1.311 ± 0.22Bb	14.81 ± 0.96Aa	15.78 ± 1.92Ba	14.68 ± 1.58Ba
Cargo	1.861 ± 0.10Ca	0.981 ± 0.42Bb	0.791 ± 0.45Bb	15.79 ± 1.43Ab	20.74 ± 1.56Aa	16.86 ± 1.56ABb
Fumarate
Cultivar	0 h	24 h	48 h	0 h	24 h	48 h
Brigitta	1.231 ± 0.24Aa	0.731 ± 0.11Aa	0.761 ± 0.41Aa	0.51 ± 0.14Aa	0.13 ± 0.08Ab	0.16 ± 0.09Bb
Star	0.551 ± 0.08Ba	0.441 ± 0.22Aa	0.341 ± 0.23Aa	0.20 ± 0.06Ba	0.04 ± 0.26Aa	0.44 ± 0.09Ab
Duke	0.341 ± 0.01Ba	0.491 ± 0.15Aa	0.391 ± 0.18Aa	0.05 ± 0.03Ca	0.00 ± 0.10Aa	0.00 ± 0.00Ba
Camellia	0.561 ± 0.04Ba	0.511 ± 0.12Aa	0.531 ± 0.30Aa	0.00 ± 0.00Ca	0.13 ± 0.01Aa	0.01 ± 0.01Ba
Cargo	0.611 ± 0.03Ba	0.521 ± 0.15Aa	0.711 ± 0.31Aa	0.00 ± 0.00Ca	0.00 ± 0.00Aa	0.00 ± 0.00Ba

Malate and fumarate concentration, and total phenols in roots and leaves in control (0 μM Al) and aluminum (200 μM Al) treatments in five cultivars at 0, 24 and 48 h. The values are the average of three measurements per cultivar and treatment. Due to a lack of differences among time points in treatments without Al, we considered the values at 0 h as the average among the start of the experiment and the respective controls for each time point (24 and 48 h). Uppercase letters indicate significant differences (p ≤ 0.05) among cultivars, and lowercase letters denote significant differences (p ≤ 0.05) among exposure times, according to the Tukey test.

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