HOST SELECTIVITY AND THE MEDIATION OF COMPETITION BY THE ROOT HEMIPARASITE RHINANTHUS-MINOR
HOST SELECTIVITY AND THE MEDIATION OF COMPETITION BY THE ROOT HEMIPARASITE RHINANTHUS-MINOR
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DOI：
10.1007/bf00317393
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发表时间：
1991-01-01
期刊：
影响因子：
2.7
通讯作者：
WATKINSON, AR
中科院分区：
文献类型：
--
作者：
GIBSON, CC;WATKINSON, AR
以多年生黑麦草和白三叶为原料，采用替代系列混播方式种植小菊（Rhinanthus minor）。 半寄生相互作用导致相对总产量（混合物中的产量相对于单作中的产量的总和）显著高于2。 半寄生虫对豆科作物的产量影响较大，但在豆科作物上的表现也较好。repens是R.小于L。在实验条件下， 当L. perenne和T.在含有或不含有R.次要半寄生虫通过选择性寄生豆科植物，显著影响了两种植物之间的竞争关系。 R.两种植物之间的竞争关系较小，但这取决于土壤的养分状况：土壤氮素水平越高，与T.而在他的作品中，则少了一份压抑。 在另一系列的试验中，紫羊茅、绒毛草和L。多年生植物生长在各种二元混合物与或没有R。还显示优选宿主的产率被抑制而有利于非优选宿主。 有人建议，介导的半寄生竞争提供了一种机制，它可能会影响植物群落的结构和多样性。
Rhinanthus minor (Yellow-rattle) was grown in replacement series mixtures with Lolium perenne and Trifolium repens. The hemiparasitic interaction resulted in Relative Yield Totals (the sum of the yields in mixture relative to those in monoculture) considerably above 2. The hemiparasite caused a greater decrease in the yield of the legume and also performed better on the legume, indicating that T. repens was a better host for R. minor than L. perenne under the experimental conditions. When L. perenne and T. repens were grown in binary mixture with or without R. minor the hemiparasite affected considerably the competitive relationship between the two species by selectively parasitizing the legume. The effect of R. minor on competition between the two species was, however, dependent upon the nutrient status of the soil: the higher the level of soil nitrogen the fewer haustorial connections were made with T. repens and the less was the depression in its yield. In another series of experiments in which Festuca rubra, Holcus lanatus and L. perenne were grown in various binary mixtures with or without R. minor it was also shown that the yield of a preferred host was depressed to the advantage of a non-preferred host. It is suggested that the mediation of competition by the hemiparasite provides a mechanism by which it might affect the structure and diversity of plant communities.