Tropical xero-epiphytic orchids undergo a photosynthetic mechanism called ‘Crassulacean Acid Metabolism’, a modification of Calvin–Benson cycle. This anabolic process aids in the long-term retention of organically fixed CO 2 , imprinting them as active sequestrators and fixers of gaseous CO 2 . The malate decarboxylation competence of enzymes—phosphoenolpyruvate carboxykinase (PEPCK), Nicotinamide Adenine Dinucleotide malic en...