Mullen R B, Schmidt S K
Department of Environmental, Population, and Organismic Biology, University of Colorado, 80309-0334, Boulder, CO, USA.
Oecologia. 1993 May;94(2):229-234. doi: 10.1007/BF00341321.
Phosphorus levels, phenology of roots and shoots, and development of vesicular arbuscular mycorrhizal (VAM) fungi were monitored for two years in natural populations of the perennial alpine herb, Ranunculus adoneus. The purpose of this study was to understand how phosphorus uptake relates to the phenology of R. adoneus and to ascertain whether arbusculus, fungal structures used for nutrient transfer, were present when maximum phosphorus accumulation was occurring. Arbuscules were only present for a few weeks during the growing season of R. adoneus and their presence corresponded with increased phosphorus accumulation in both the roots and shoots of R. adoneus. In addition, phosphorus accumulation and peaks in mycorrhizal development occurred well after plant reproduction and most plant growth had occurred. The late season accumulation of phosphorus by mycorrhizal roots of R. adoneus is stored for use during early season growth and flowering the following spring. In this way R. adoneus can flower before soils thaw and root or mycorrhizal nutrient uptake can occur.
对多年生高山草本植物腺毛茛的自然种群进行了为期两年的磷含量、根和茎的物候以及泡囊丛枝菌根（VAM）真菌发育的监测。本研究的目的是了解磷的吸收与腺毛茛的物候之间的关系，并确定在磷积累达到最大值时，用于养分转移的丛枝菌根结构——丛枝是否存在。丛枝仅在腺毛茛生长季节的几周内出现，它们的出现与腺毛茛根和茎中磷积累的增加相对应。此外，磷的积累和菌根发育的峰值在植物繁殖和大部分植物生长之后才出现。腺毛茛菌根根在生长季后期积累的磷被储存起来，供次年春季生长季早期和开花时使用。通过这种方式，腺毛茛可以在土壤解冻以及根系或菌根吸收养分之前开花。
