Phosphate fraction and metabolic functions Inorganic form Most is orthophosphate, and a miner extent as pyrophosphate(焦磷酸盐). Organic form: The organic forms of phosphate are compounds in which the orthophosphate is esterified with hydroxy groups and alcohols or bound by a pyrophosphate bond to another bond to another phosphate group
Phosphate fraction and metabolic functions • Inorganic form: • Most is orthophosphate, and a miner extent as pyrophosphate(焦磷酸盐). • Organic form: • The organic forms of phosphate are compounds in which the orthophosphate is esterified with hydroxyl groups and alcohols or bound by a pyrophosphate bond to another bond to another phosphate group
Phosphate fraction and metabolic functions Organic form: ATP-energy storage molecule Fructose-6-phosphate Nucleic acids- DNA and RNA Phosoplipids -important component of the cel‖ membrane, such as lecithin(卵磷
• Organic form: – ATP – energy storage molecule – Fructose-6-phosphate – Nucleic acids – DNA and RNA – Phosoplipids – important component of the cell membrane, such as lecithin(卵磷 脂） Phosphate fraction and metabolic functions
OH OH OH OH OH H CH NHo
Phytin ftix-storage form for P in seeds. During seed germination, phytin P is converted into other phosphate forms that are needed for the young plants PO. PO PO PO PO PO4 Phytin
Phytin 植素– storage form for P in seeds. During seed germination, phytin P is converted into other phosphate forms that are needed for the young plants
Effect of P supply on the concentration of various P forms in spinach leaves and oat grains (Micheal 1939) Phospholipid Nucleic acid tate Inorganic P in mg/g dry matter Oat grain uate 0.2 2. 0.05 Adequate 0.22 24 0.5 Spinach nadequate 0.9 Adequate 09 18.0
Effect of P supply on the concentration of various P forms in spinach leaves and oat grains (Micheal 1939) Phospholipid Nucleic acid Phytate Inorganic P supply P in mg/g dry matter Oat grain Inadequate 0.22 2.1 0.05 0.5 Adequate 0.22 2.4 0.5 1.3 Spinach Inadequate 1.1 0.9 - 2.2 Adequate 1.1 0.9 - 18. 0