School of Tropical Agriculture and Forestry, Hainan University, Haikou, China.
Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture and Rural Affairs, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.
Oecologia. 2024 Oct;206(1-2):11-20. doi: 10.1007/s00442-024-05606-y. Epub 2024 Aug 12.
Many invasive plants can reproduce through both seeds and clonal growth. In habitats, interacting seedlings may originate from the same mother, and interacting ramets originating from the same plant may not be adjacent to each other in the stolon, particularly for vines that can show curved growth. However, in a homogeneous environment, how kinship and integration between adjacent/non-adjacent ramets affect plant growth and feedback with soil biota has been less studied. We address these questions using an invasive stoloniferous vine Mikania micrantha. We found that sibling groups and stranger groups did not differ in biomass production, root allocation and feedback with soil biota, indicating that kin recognition is unlikely in M. micrantha. For two-ramet stolon fragments in which interacting ramets were adjacent to each other, older ramets allocated more biomass to roots than younger ramets when integrated, particularly in comparison with disconnected ramets from different genotypes, indicating that a division of labor was induced. For four-ramet stolon fragments in which there were two unrooted ramets between the two rooted, interacting ramets, integration increased biomass allocation to roots, possibly because only two of the four ramets could absorb belowground resources and a lower shoot allocation decreased aboveground light competition. When inoculated with soil biota conditioned by the four-ramet integrated fragments, plants of M. micrantha also increased biomass allocation to roots. These results indicate that the distance between interacting ramets in the stolon may affect the integration effect and feedback with soil biota in clonal plants.
许多入侵植物可以通过种子和无性繁殖来繁殖。在栖息地中，相互作用的幼苗可能来自同一母体，而来自同一植物的相互作用的分株在匍匐茎中可能彼此不相邻，特别是对于可以表现出弯曲生长的藤本植物。然而，在同质环境中，相邻/不相邻分株之间的亲缘关系和整合如何影响植物的生长和与土壤生物群的反馈还研究较少。我们使用入侵的匍匐茎藤本植物 Mikania micrantha 来解决这些问题。我们发现，同卵和异卵分株组在生物量生产、根系分配和与土壤生物群的反馈方面没有差异，这表明 M. micrantha 中不太可能存在亲缘识别。对于两个分株匍匐茎片段，其中相互作用的分株彼此相邻，当整合时，较老的分株比较年轻的分株更多地将生物量分配给根系，特别是与不同基因型的不连接分株相比，表明存在分工。对于四个分株匍匐茎片段，在两个有根的相互作用的分株之间有两个无根的分株，整合增加了根系的生物量分配，这可能是因为只有四个分株中的两个可以吸收地下资源，并且较低的地上分配减少了地上光竞争。当用由四个分株整合片段培养的土壤生物群接种时，M. micrantha 的植物也增加了根系的生物量分配。这些结果表明，匍匐茎中相互作用的分株之间的距离可能会影响克隆植物的整合效应和与土壤生物群的反馈。
