Lüscher Andreas, Connolly John, Jacquard Pierre
Eidgenössische Technische Hochschule, Institut für Pflanzenwissenschaften, ETH-Zentrum, 8092, Zürich, Switzerland.
Department of Statistics, University College Dublin, 4, Dublin, Ireland.
Oecologia. 1992 Sep;91(3):404-409. doi: 10.1007/BF00317630.
Five genotypes of Trifolium repens and Lolium perenne were collected as neighbouring pairs along a fertility gradient in a natural pasture. After vegetative multiplication, the 25 possible combinations of Lolium genotype x Trifolium genotype were planted in the greenhouse in order to investigate competition between the genotypes. The comparison of the five combinations whose individual components had been neighbours with the combinations of genotypes that had not coexisted before disclosed no difference in total biomass production over 7 months. However, the yield of Trifolium increased when grown with the Lolium genotype which had been its natural neighbour, while the latter showed a decrease in yield. This neighbour specificity existed even when carryover effects from the sampling site had been eliminated (preconditioning period of 18 months) and when native Rhizobium strains were not present (inoculation with a non-native strain). The complex pattern of neighbour specificity with time indicated the importance of environmental conditions for its outcome. These results are a further confirmation of positive effects on the growth of Trifolium repens when grown together with its natural neighbour. They are discussed in the context of coexistence and coevolution.
在一片天然牧场中，沿着肥力梯度收集了5种白三叶草和多年生黑麦草的基因型作为相邻对。营养繁殖后，将多年生黑麦草基因型×白三叶草基因型的25种可能组合种植在温室中，以研究基因型之间的竞争。将其各个组分曾为相邻对的5种组合与之前未曾共存的基因型组合进行比较，结果显示7个月内总生物量产量并无差异。然而，白三叶草与曾是其天然邻体的多年生黑麦草基因型一起生长时，产量增加，而后者产量下降。即使消除了采样地点的残留效应（18个月的预处理期）且不存在本地根瘤菌菌株（接种非本地菌株），这种邻体特异性依然存在。邻体特异性随时间变化的复杂模式表明环境条件对其结果的重要性。这些结果进一步证实了白三叶草与其天然邻体一起生长时对其生长具有积极影响。并在共存和共同进化的背景下进行了讨论。
