Architectural plasticity in response to population density in Abutilon theophrasti (Malvaceae)
Architectural plasticity in response to population density in Abutilon theophrasti (Malvaceae)
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苘麻科（锦葵科）的建筑可塑性对人口密度的响应
DOI：
10.1111/1440-1703.12284
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发表时间：
2022
影响因子：
2
通讯作者：
Dao-Wei Zhou
中科院分区：
文献类型：
--
作者：
Shu Wang;Dao-Wei Zhou
人口密度的增加可能导致资源在比个体更小的尺度上的时空异质性，在植物的不同位置或建筑的可塑性上引起不同的模块响应。为了更好地了解植物如何通过建筑可塑性对密度做出反应，我们对一年生植物Abutilon theophrasti进行了野外实验。将植株置于三种密度下，在第50天和第70天收获，每株植株从下到上垂直分成不同的层，层间距离为10或20厘米，然后我们测量了每层的一系列性状，并分析了它们在层、密度和阶段之间的变化。密度的增加降低了各层间性状的变异，对各层模块化性状有不同的影响：增加了第3 ~ 5层（l3 ~ l5）的茎质量，增加了顶层的茎粗，导致下层茎密度增加，顶层茎密度减少。叶柄长、叶柄质量、叶片大小、叶数在上层呈增加趋势，而在下层呈减少趋势。结果表明，在密集种群中，植物在茎密度和叶片性状上存在着上下两层的权衡，这对于将大多数叶片保持在较高的位置以获取光照资源和节约能量至关重要，同时也与茎伸长的努力和分支性状的复杂可塑性相一致。
An increase in population density may result in the spatial and temporal heterogeneity of resources at scales smaller than an individual, inducing different modular responses at different positions of a plant, or architectural plasticity. To better understand how plants respond to density via architectural plasticity, we conducted a field experiment on an annual species,Abutilon theophrasti. Plants were subjected to three densities and harvested at 50 and 70 days, when each individual plant was separated into different layers vertically from bottom to top with an inter‐layer distance of 10 or 20 cm, before we measured a series of traits per layer and analyzed variations in them among layers, densities, and stages. Increased density reduced variation of traits among layers and had different effects on different layers of modular traits: it increased stem mass in the third to fifth layers (L3–L5) and increased stem diameter in the top layer, leading to an increase in stem density in lower layers and a decrease in stem density in the top layer. In addition, there was an increase in petiole length and mass, lamina size, and leaf number in upper layers, while they decreased in lower layers. Results suggested trade‐offs between upper and lower layers in stem density and leaf traits for plants in a dense population, which were important for keeping most leaves at higher positions to acquire light resources, while saving energy, in concert with the effort of extra stem elongation and the complex plasticity in branch traits.