U.S.-Sweden Cooperative Research: Ecology and Physiology ofAlnus-Frankia Symbiosis

该奖项将支持生态学方面的合作研究 俄勒冈州州立大学的大卫Myrold博士和 Kerstin Huss-Danell，植物生理学系，大学 Umea，瑞典 该项目将研究两个重要问题， Alnus-Frankia共生，即几个因素的影响 对土壤中Frankia的生物量和多样性的影响， 固定氮释放到土壤中的数量。在 特别是，土壤将从一个既定的研究取样， 已通过石灰，NPK施肥和 引进桤木。 将对这种土壤进行化验， 用植物生物测定法和DNA探针法测定Frankia生物量。的 这些实验的结果将不仅提供重要的 了解Alnus-Frankia共生的新信息，但 将进一步提供新的见解放线根 植物一般。 这些植物在生态上很重要， 因为它们能迅速改变生态系统的进程 改变系统的氮含量， 发生. 它们在林业、土地开垦、 和园艺。该项目将受益于补充- Myrold博士在微生物学方面的专业知识， Huss-Danell in Plant Physiology. Myrold博士也可以 利用瑞典的一个实地考察点， 经过广泛研究，非常适合 提议的研究。

This award will support collaborative research in ecology between Dr. David Myrold, Oregon State University and Dr. Kerstin Huss-Danell, Department of Plant Physiology, University of Umea, Sweden. The project will examine two important questions concerning Alnus-Frankia symbiosis, namely the effect of several factors on the biomass and diversity of Frankia in the soil and the amount of fixed N released to the soil by nodulated Alnus. In particular, soil will be sampled from an established research site that has been treated by liming, NPK fertilization and the introduction of alder. This soil will be assayed for Frankia biomass by plant bioassay and DNA probe methods. The results of these experiments will not only provide important new information in understanding Alnus-Frankia symbiosis, but will by extension provide new insight into actinorhizal plants in general. These plants are ecologically important, because they can alter ecosystem level processes by rapidly altering the nitrogen content of the systems in which they occur. They also have importance in forestry, land reclamation and horticulture. This project will benefit from the compleme- ntary expertise of Dr. Myrold in microbiology and of Dr. Huss-Danell in plant physiology. Dr. Myrold will also be able to take advantage of a field site in Sweden which has been extensively studied and is exceptionally well suited to the proposed research.