肉质与非肉质植物类群的结构叶性状谱的分异。

Divergent structural leaf trait spectra in succulent versus non-succulent plant taxa.

机构信息

Department of Land, Environment, Agriculture and Forestry, University of Padova, Legnaro (PD), Italy.

Department of Agricultural, Forest and Food Sciences, Università degli Studi di Torino, 10095 Grugliasco (TO), Italy.

出版信息

Ann Bot. 2024 Aug 22;134(3):491-500. doi: 10.1093/aob/mcae093.

DOI:10.1093/aob/mcae093

PMID:38833416

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11341667/

Abstract

BACKGROUND AND SCOPE

Plant functional traits are the result of natural selection to optimize carbon gain, leading to a broad spectrum of traits across environmental gradients. Among plant traits, leaf water storage capacity is paramount for plant drought resistance. We explored whether leaf-succulent taxa follow trait correlations similar to those of non-leaf-succulent taxa to evaluate whether both are similarly constrained by relationships between leaf water storage and climate.

METHODS

We tested the relationships among three leaf traits related to water storage capacity and resource use strategies in 132 species comprising three primary leaf types: succulent, sclerophyllous, and leaves with rapid returns on water investment, referred to as fast return. Correlation coefficients among specific leaf area (SLA), water mass per unit of area (WMA), and saturated water content (SWC) were tested, along with relationships between leaf trait spectra and aridity determined from species occurrence records.

RESULTS

Both SWC and WMA at a given SLA were ~10-fold higher in succulent leaves than in non-succulent leaves. While SWC actually increased with SLA in non-succulent leaves, no relationship was detected between SWC and SLA in succulent leaves, although WMA decreased with SLA in all leaf types. A principal component analysis (PCA) revealed that succulent taxa occupied a widely different mean trait space than either fast-return (P < 0.0001) or sclerophyllous (P < 0.0001) taxa along the first PCA axis, which explained 63 % of mean trait expression among species. However, aridity only explained 12 % of the variation in PCA1 values. This study is among the first to establish a structural leaf trait spectrum in succulent leaf taxa and quantify contrasts in leaf water storage among leaf types relative to specific leaf area.

CONCLUSIONS

Trait coordination in succulent leaf taxa may not follow patterns similar to those of widely studied non-succulent taxa.

摘要

背景与范围

植物功能性状是为了优化碳增益而进行自然选择的结果，导致在环境梯度上出现广泛的性状。在植物性状中，叶片水分储存能力对植物抗旱性至关重要。我们探讨了叶肉质类群是否遵循与非叶肉质类群相似的性状相关性，以评估它们是否都受到叶片水分储存与气候之间关系的类似限制。

方法

我们测试了在 132 种物种中与水分储存能力和资源利用策略相关的三个叶片性状之间的关系，这些物种包括三种主要的叶片类型：肉质叶、硬叶和水分投资快速回报叶片，称为快速回报叶片。我们测试了比叶面积（SLA）、单位面积水分质量（WMA）和饱和含水量（SWC）之间的特定相关性系数，以及从物种出现记录中确定的叶片性状谱与干旱之间的关系。

结果

在给定 SLA 的情况下，肉质叶的 SWC 和 WMA 比非肉质叶高约 10 倍。虽然在非肉质叶中 SWC 实际上随着 SLA 的增加而增加，但在肉质叶中未检测到 SWC 和 SLA 之间的关系，尽管在所有叶片类型中 WMA 随着 SLA 的增加而降低。主成分分析（PCA）显示，肉质叶类群占据了与快速回报（P<0.0001）或硬叶（P<0.0001）类群广泛不同的平均性状空间，第一 PCA 轴解释了物种间平均性状表达的 63%。然而，干旱仅解释了 PCA1 值变化的 12%。这项研究首次在肉质叶类群中建立了一个结构叶片性状谱，并量化了相对于比叶面积的不同叶片类型之间叶片水分储存的差异。