Sokolovski Sergei G, Meharg Andy A, Maathuis Frans J M
IBLS Western Court, University of Glasgow, Glasgow G12 8QQ UK.
Department of Plant and Soil Science, University of Aberdeen, Machar Drive, Aberdeen AB24 3UU UK.
New Phytol. 2002 Sep;155(3):525-530. doi: 10.1046/j.1469-8137.2002.00485.x.
• Ericoid mycorrhizas are believed to improve N nutrition of many ericaceous plant species that typically occur in habitats with impoverished nutrient status, by releasing amino acids from organic N forms. Despite the ubiquity of mycorrhizal formation the mechanisms and regulation of nutrient transport in mycorrhizal associations are poorly understood. • We used an electrophysiological approach to study how amino acid transport characteristics of Calluna vulgaris were affected by colonization with the ericoid mycorrhiza fungus Hymenoscyphus ericae . • Both the V and K parameters of amino acid uptake were affected by fungal colonization in a manner consistent with an increased availability of amino acid to the plant. • The ecophysiological significance of altered amino acid transport in colonized root cells of C. vulgaris is discussed.
• 人们认为，石楠状菌根通过从有机氮形式中释放氨基酸，改善了许多通常生长在营养状况贫瘠生境中的石楠科植物物种的氮营养。尽管菌根形成普遍存在，但对菌根共生体中养分运输的机制和调控了解甚少。
• 我们采用电生理方法研究了石楠状菌根真菌欧石楠小皮伞（Hymenoscyphus ericae）的定殖如何影响普通石楠（Calluna vulgaris）的氨基酸运输特性。
• 氨基酸吸收的V和K参数均受到真菌定殖的影响，其方式与植物可利用氨基酸的增加相一致。
• 讨论了普通石楠定殖根细胞中氨基酸运输改变的生态生理意义。
