Cairney J W G, Alexander I J
Department of Plant and Soil Science, University of Aberdeen, Aberdeen AB9 2UE, Scotland, UK.
New Phytol. 1992 Sep;122(1):153-158. doi: 10.1111/j.1469-8137.1992.tb00061.x.
Translocation of C-labelled photosynthate was studied in seedlings of Picea sitchensis (Bong.) Carr. ectomycorrhizal with Tylospora fibrillosa (Burt.) Donk grown in Perspex observation chambers. Although translocation to young and older mycorrhizas was observed, accumulation of current C-labelled photosynthate was reduced in older compared with young mycorrhizas in the same root system. Non-structural carbohydrate components of P. sitchensis/T. fibrillosa and undefined beech ectomycorrhizas collected from the field were quantified by gas-liquid chromatography. Relative differences in accumulated carbohydrates were identified between P. sitchensis/T. fibrillosa and beech mycorrhizas. Levels of total soluble and insoluble carbohydrate were lower in older compared with young P. sitchensis/T. fibrillosa mycorrhizas. The soluble sugars arabitol, glucose and mannitol were detected in significantly lower quantities in older mycorrhizas whilst fructose and trehalose content was similar to that of young mycorrhizas. These results are discussed in relation to the physiology of the ageing mycorrhiza.
在有机玻璃观察室中，对与纤维状 tylospora（Burt.）Donk 形成外生菌根的西加云杉（Picea sitchensis (Bong.) Carr.）幼苗中 C 标记光合产物的转运进行了研究。尽管观察到光合产物向幼龄和老龄菌根的转运，但在同一根系中，老龄菌根中当前 C 标记光合产物的积累量比幼龄菌根减少。通过气液色谱法对从田间采集的西加云杉/纤维状 tylospora 和未定义的山毛榉外生菌根的非结构性碳水化合物成分进行了定量。确定了西加云杉/纤维状 tylospora 和山毛榉菌根之间积累碳水化合物的相对差异。老龄西加云杉/纤维状 tylospora 菌根中总可溶性和不溶性碳水化合物的水平低于幼龄菌根。在老龄菌根中检测到的可溶性糖阿拉伯糖醇、葡萄糖和甘露醇的含量明显较低，而果糖和海藻糖的含量与幼龄菌根相似。结合老龄菌根的生理学对这些结果进行了讨论。
