高等植物对有机氮吸收与利用研究进展

主要综述植物氨基酸营养生理生化和分子生物学研究的最新进展。长期以来，人们一直认为植物只能吸收无机态N，有机N必须矿化为无机N后才能被植物吸收利用，而近年来越来越多实验证明植物能吸收有机N，特别是氨基酸，其吸收能力因植物种类而异，生长在有机N丰富的北极，高山和亚高山生态环境中的植物甚至嗜好氨基酸，因此，不应过分夸大有机N矿化的重要性，迄今一些植物细胞质膜上的氨基酸转运子基因已被描述并加以克隆。

Advances in Study of Plant Organic Nitrogen Nutrition

Traditional models of nutrient cycling assume that soil microorganisms must decompose organic matter, releasing inorganic N, before that N becomes available for plant uptake. But, there is a growing evidences that plant can take up organic N. In the moist tundra of arctic tundra, most wetland are poor inorganic, plant-available nutrients because mineralization is restricted due to low temperatures and anoxic soils. But tundra soils have higher concentrations of water-extractable free amino acids than o...