Fig. 1

Evaluation of fruit acidity and causal organic acids. Standard deviations were shown with the error bars. a TA and malate concentrations measured in the ten apple varieties, which were abbreviated as the following: B Britegold, N Novosibirski Sweet, P PI323617, S Sweet Delicious, C Cox’s Orange Pippin, E Empire, F Fuji, G Granny Smith, J Jonathan, R Rome Beauty Law. The first four are of genotype mama whereas the last six of genotype Ma_. b Mean TA and malate concentrations in genotype groups Ma_ and mama. c Concentrations of succinate, fumarate, citrate and maleate in genotype groups Ma_ and mama. d Fruit pH readings in the ten apples