Coordination of leaf economics traits within the family of the world's fastest growing plants (Lemnaceae)
Coordination of leaf economics traits within the family of the world's fastest growing plants (Lemnaceae)
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DOI：
10.1111/1365-2745.13710
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发表时间：
2021-06-20
影响因子：
5.5
通讯作者：
Ike，Michihiko
中科院分区：
文献类型：
--
作者：
Ishizawa，Hidehiro;Onoda，Yusuke;Ike，Michihiko
浮萍科（浮萍科）是一组自由漂浮的水生植物，其身体由无性繁殖的单个漂浮叶组成。虽然它们被认为在高等植物中具有最快的相对生长速率（RGR），但它们的功能性状协调与RGR的家族内变异的关系知之甚少。我们测试了浮萍物种如何适应被称为全球叶经济谱（LES）的性状协变模式。为此，我们对15种浮萍的功能性状进行了评价，并将其协变模式与全球植物功能性状数据库中的协变模式进行了比较。作为一个群体，浮萍表现出最具收购性的一套性状，具有极小的叶面积质量（LMA）、短的寿命和高的基于质量的光合速率（Amass）。这些LES性状表现出紧密的相关性与RGR，证实了我们的假设，收购叶资源经济学的基础上，他们非常高的RGR。但与其他高等植物不同的是，浮萍科的叶片寿命和叶片质量与叶片平均寿命的相关性较弱。我们还发现浮萍LMA和基于面积的光合速率之间存在独特的正相关性，这表明它们的LMA与典型的高等植物相比具有不同的功能意义。浮萍是世界上生长最快的植物，大多数都遵循世界范围的LES并位于其极端。从LES的轻微偏差突出表明，浮萍经历了一些物理和化学的限制，而不是面临其他高等植物。
The duckweed family (Lemnaceae) is a group of free‐floating aquatic plants with bodies consisting of single floating fronds that multiply clonally. Although they are known to have the fastest relative growth rate (RGR) among higher plants, their functional trait coordination in relation to within‐family variation of RGR is poorly understood.We tested how duckweed species fit within the trait covariation patterns known as the world‐wide leaf economics spectrum (LES). To this end, several functional traits were evaluated for 15 duckweed species, and their covariation patterns were compared with those in the global database of plant functional traits.As a group, duckweeds exhibited the most acquisitive suite of traits, with extremely small leaf mass per area (LMA), short life span and high mass‐based photosynthetic rate (Amass). These LES traits showed a tight correlation with RGR, corroborating our hypothesis that acquisitive leaf resource economics underpins their extremely high RGR. However, unlike other higher plants, LMA showed weak association with leaf life span andAmasswithin duckweed family. We also found a unique positive correlation between duckweed LMA and area‐based photosynthetic rates, an indication that their LMA represents different functional significance compared to typical higher plants.Synthesis. Duckweeds, the world's fastest growing plants, mostly follow the world‐wide LES and locate at its extreme end. The slight deviation from the LES highlights that duckweeds experience some physical and chemical constraints not faced by other higher plants.