Potassium fertilization arrests malate accumulation and alters soluble sugar metabolism in apple fruit

• DOI: 10.1242/bio.024745
• Publication Date: 2018-11-07T10:15:14Z
• Authors: Wen Zhang; Xian Zhang; Yufei Wang; Nishang Zhang; Yanping Guo; Xiaolin Ren; Zhengyang Zhao
• Keywords: Malus; Malic acid; Malate dehydrogenase; Titratable acid

Effects of different potassium (K) levels, which were K0 (no fertilizer), K1 (71.5g KCl Plant−1 yr−1), K2 (286.7g and K3 (434g evaluated based on sugar organic acid metabolism levels from 70 to 126 days after bloom (DAB) in the developing fruit potted five-year old apple (Malus domestica, Borkh.) trees. The results indicate that K fertilization promoted greater mass, higher Ca2+ soluble solid content, lower titratable as well increased pH values at harvest. With application fertilizer, fructose, sorbitol, glucose, sucrose accumulation rates significantly change during development. Fruit group had sucrose, glucose content than those other treatment groups DAB. These changes are related activity metabolic enzymes. Sucrose synthase (SS) Sorbitol dehydrogenase (SDH) treated 70-126 Malate K-supplemented was notably non fruit, lowest malate Cytosolic malic enzyme (ME) phosphoenolpyruvate carboxykinase (PEPCK) under 112-126 DAB 98-126 DAB, respectively. In addition, concentration with increasing a maximum 11.72 mg g−1 dry weight fruit. show can alter due interaction between sugars acid-metabolic enzymes