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Invasive plant rhizome production and competitiveness vary based on neighbor identity
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-03-09 , DOI: 10.1093/jpe/rtab024 Alyssa Laney Smith 1 , Daniel Z Atwater 2 , Wonjae Kim 1 , David C Haak 1 , Jacob N Barney 1
中文翻译:
入侵植物根茎的产量和竞争力因邻居身份而异
更新日期:2021-04-27
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-03-09 , DOI: 10.1093/jpe/rtab024 Alyssa Laney Smith 1 , Daniel Z Atwater 2 , Wonjae Kim 1 , David C Haak 1 , Jacob N Barney 1
Affiliation
Abstract
Aims
Within-species genetic and phenotypic variation have well-known effects on evolutionary processes, but less is known about how within-species variation may influence community-level processes. Ecologically meaningful intraspecific variation might be particularly important in the context of anthropogenic impacts on natural systems, such as agriculture and species invasion, because human actions can cause strong selection pressures.Methods
In a greenhouse study, we explored intraspecific (30 accessions) and ecotypic variation (representing agricultural and nonagricultural habitats) in biomass and rhizome production in response to inter- and intraspecific competition and soil fertility of Johnsongrass (Sorghum halepense), a widespread invasive species and agricultural weed.Important Findings
Contrary to our expectations and previous results, we did not find variation in biomass production among Johnsongrass ecotypes at this early life stage. However, we did find that Johnsongrass biomass varied substantially depending on competitor identity, soil fertility treatments and among accessions. Rhizomes were 11% larger in the agricultural ecotype and up to 3-fold larger in fertilized treatment; while rhizome biomass increased by ~50% when fertilized, but did not differ among ecotypes. Interestingly, in competition, Johnsongrass produced 32% less biomass and 20% less rhizome mass with a conspecific than when competing interspecifically with corn. Our results indicate species-specific competitive responses and changes in rhizome allocation in response to neighbor identity; suggesting the possibility of adaptation by Johnsongrass to shift allocation under competition.
中文翻译:
入侵植物根茎的产量和竞争力因邻居身份而异
摘要
目的
种内遗传和表型变异对进化过程有众所周知的影响,但关于种内变异如何影响社区水平过程的知之甚少。在人类活动对自然系统(例如农业和物种入侵)的影响的背景下,具有生态意义的种内变异可能特别重要,因为人类的行为可能会导致强烈的选择压力。方法
在温室研究中,我们探索了Johnsongrass(高粱halepense),种入侵物种和杂种的种间和种内竞争和土壤肥力,生物量和根茎生产中的种内(30种)和生态型变化(代表农业和非农业生境)。农业杂草。重要发现
与我们的预期和先前的结果相反,在生命的早期阶段,我们没有发现约翰逊草生态型之间生物量生产的差异。但是,我们确实发现,庄臣草的生物量在很大程度上取决于竞争者的身份,土壤肥力处理以及种质之间的差异。在农业生态型中,根茎大11%,而在受精处理中大3倍。受精后,根茎生物量增加了约50%,但不同生态类型之间没有差异。有趣的是,在竞争中,与草种间竞争时,约翰逊草产生的同种菌素减少了32%的生物量和20%的根茎质量。我们的结果表明特定物种的竞争反应和根茎分配响应邻居身份的变化。