The Effect of Mycorrhizae on Plant Growth and Reproduction Varies with Soil Phosphorus and Developmental Stage
The Effect of Mycorrhizae on Plant Growth and Reproduction Varies with Soil Phosphorus and Developmental Stage
复制标题
菌根对植物生长繁殖的影响随土壤磷素和发育阶段的不同而不同
DOI：
10.1674/0003-0031-167.1.28
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
M. Ronsheim
中科院分区：
文献类型：
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作者：
M. Ronsheim
摘要确定环境变化和发育阶段对植物-菌根关联的影响是重要的，因为两者都可以沿着互惠-寄生连续体改变关联。本研究探讨了磷水平的影响，在所有的植物生命阶段，包括植物生殖力和相对分配的资源，以三种不同的生殖模式（花，无性地下偏移，和无性空中珠芽）的响应，大蒜vineale真菌。对于. vineale，菌根的影响随生命阶段的变化显着，在1个月的早期生长抑制被逆转了15个月，导致菌根植物在所有P水平下具有更大的鳞茎，并在较低的P水平下产生更多的珠芽和更大的偏移比非菌根植物。但真菌的存在并不影响资源在三种繁殖方式中的相对分配。这些结果强调了长期研究植物菌根相互作用，包括生殖力估计的重要性。此外，他们还指出，田间营养物质可用性的空间变化有可能将真菌的整体影响从有益转变为中性，在磷水平较低的地点发现更大的益处。
Abstract Determining the impact of both environmental variation and developmental stage on plant-mycorrhizal associations is important, as both can shift the association along the mutualism-parasitism continuum. This study examines the effect of phosphorus level on the response of Allium vineale to mycorrhizae across all plant life stages, including plant fecundity and the relative allocation of resources to three different reproductive modes (flowers, asexual underground offsets, and asexual aerial bulbils). For A. vineale, the impact of mycorrhizae varies significantly with life stage, as an early growth depression at 1 mo was reversed by 15 mo, resulting in mycorrhizal plants having larger bulbs over all P levels and producing more bulbils and larger offsets than nonmycorrhizal plants at lower P levels. However the presence of mycorrhizae did not affect the relative allocation of resources among the three reproductive modes. These results emphasize the importance of long-term studies of plant-mycorrhizal interactions that include fecundity estimates. In addition, they indicate that spatial variation in nutrient availability in the field has the potential to shift the overall effect of mycorrhizae from beneficial to neutral, with greater benefits found in sites with lower phosphorus levels.