Molecular, Biochemical and Ultrastructural Changes Induced by Pb Toxicity in Seedlings of Theobroma cacao L.
Fig 9
Accumulation of mineral macronutrients (Mg, Ca, K) in roots (triangle), stem (circle) and leaves (rhombus) of two progenies of T. cacao exposed to increasing of Pb doses.
CCN-10 x SCA-6 (A,C, e E) and Catongo (B,D,e F). Mean values of nine replicates (± SE). The absence of error bars indicates that the size of the error does not exceed the size of the symbol. The equations of regression curves were: Mg—CCN-10 x SCA-6: ŷ = 54.41 for leaf, ŷ = 7.05 for stem, ŷ = 2.54 for root. Catongo: ŷ = 6.03 for leaf, ŷ = 10.39 for stem, ŷ = 2.47 for root. Ca—CCN-10 x SCA-6: ŷ = 11.56 for leaf, ŷ = 12.10 for stem, ŷ = 2.19 for root. Catongo: ŷ = 18.54 for leaf, ŷ = 14.84 for stem, ŷ = 3.20 for root. K—CCN-10 x SCA-6: ŷ = 42.24 +0.8097*x (R2 = 0.93) for leaf, ŷ = 42.46 +0.8796*x (R2 = 0.88) for stem, ŷ = 14.09 for root. Catongo: ŷ = 43.15–1.9433*x (R2 = 0.74) for leaf, ŷ = 32.78 for stem, ŷ = 15.21 for root