Effect of vesicularndash;arbuscular mycorrhizal fungi and phosphorus on the survival and growth of flowering dogwood (Cornus florida)

摘要

Mycorrhizal development and growth of flowering dogwood (Cornus floridaL.) seedlings were investigated in a field nursery and glasshouse. Seedlings and associated soil were collected from April to November from a fumigated nursery bed that contained areas of both stunted and rapidly growing plants. The rate of mycorrhizal colonization and associated spore formation were greater on the rapidly growing seedlings. In a glasshouse test, dogwood seedlings were inoculated with chlamydospores ofGlomus etunicatum,G.intraradices, or a control solution which contained microorganisms associated with the mycorrhizal fungi, and were fertilized weekly with Hoagland's solutions which had 0, 47, or 93ensp;mgensp;P∙Lminus;1. After 12 weeks, seedlings inoculated withG.etunicatumhad greater survival, shoot dry mass, and root fresh mass than seedlings inoculated withG.intraradicesor the control. However,G.etunicatumdid not affect the concentration or total uptake of P into shoots. This fungus can apparently enhance the survival and growth of dogwood seedlings without improving P nutritio