Crop Health, Faculty of Agricultural and Environmental Sciences, University of Rostock, Rostock, Germany.
Experimental Plant Ecology, Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany.
PLoS One. 2020 Oct 9;15(10):e0240538. doi: 10.1371/journal.pone.0240538. eCollection 2020.
Key plant traits affecting growth performance can differ among and within species, influencing competitive plant community dynamics. We determined the intra-specific variability of germination base temperature among 13 arable weed species and the seedlings' early post-emergence relative growth rate among 21 species in climate chamber and green house experiments. Intra-specific variability was quantified with two seed populations (originating from contrasting climate in Germany & France) for the germination base temperature of 6 species and for the early growth rate of 16 species. Inter-specific variability for both traits was always higher than intra-specific variability. Within a given species, we found that germination base temperatures were higher in seeds stemming from colder climate populations. Seedling relative growth rates did not differ between seed populations. Models simulating weed growth should reflect these differences in germination traits among populations, especially when they are used for weed community assembly studies in a local to regional extent.
影响生长性能的关键植物特性在种内和种间可能存在差异，从而影响竞争植物群落的动态。我们在气候室和温室实验中确定了 13 种耕地杂草物种的发芽基础温度的种内变异性，以及 21 种物种的幼苗早期出土后的相对生长率。对于 6 种物种的发芽基础温度和 16 种物种的早期生长率，我们使用两个种子种群（分别来自德国和法国的不同气候）来量化种内变异性。对于这两个特性，种间变异性总是高于种内变异性。在给定的物种内，我们发现来自较冷气候种群的种子的发芽基础温度较高。幼苗的相对生长率在种子种群之间没有差异。模拟杂草生长的模型应反映这些种群之间发芽特性的差异，特别是当它们用于局部到区域范围内的杂草群落组装研究时。
