Involved in storage lipid mobilization during the growth of higher plant seedling. D-threo-isocitrate = glyoxylate + succinate Carbohydrate metabolism; glyoxylate cycle; (S)-malate from isocitrate: step 1/2. Expressed in leaves. By submergence in seedlings (PubMed:15944756). By dark-induced senescence in leaves (PubMed:11432928, PubMed:23296688). Belongs to the isocitrate lyase/PEP mutase superfamily. Isocitrate lyase family.