Additional file 2: Figure 2. Determination of $${\mathrm{O}}_{2}^{-\bullet }$$ O 2 - ∙ , H2O2 and MDA content in Jin A (left), Yamian A(right) and their maintainers Jin B, Yamian B. (a) Content of $${\mathrm{O}}_{2}^{-\bullet }$$ O 2 - ∙ in Jin A (left) and Yamian A (right). (b) Content of H2O2 in Jin A (left) and Yamian A (right). (c) Content of MDA in Jin A (left) and Yamian A (right). Values are means ± SD of three replicates. Asterisks represent statistically significant differences between sterile line and its maintainer (* P < 0.05; ** P < 0.01, Student’s t tests).