从马尾松到山白蜡,特定的叶面积与桉树的身材、重新萌发、茎干结构和果实大小相协调

IF 0.9 4区 生物学 Q4 PLANT SCIENCES Australian Journal of Botany Pub Date : 2023-12-14 DOI:10.1071/bt23028
Antoinette M. Portelli, Saras M. Windecker, Laura J. Pollock, Will C. Neal, William K. Morris, Rohan Khot, Peter A. Vesk
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引用次数: 0

摘要

背景桉树向澳大利亚几乎所有环境的辐射为植物生态策略提供了宝贵的见解。目的我们旨在评估不同器官的功能特征在多大程度上是独立的,还是反映了南部桉树的协调策略。方法我们对澳大利亚南部的 164 个分类群进行了普通和系统发育广义最小二乘法回归,考察了代表身材、叶片经济学、繁殖和火后再生等方面的 10 个功能性状之间的配对关系网络。我们研究了这一网络中的协调性和模块性,并估计了系统发生如何影响观察到的性状相关性。结果 茎和身材性状一般与生殖性状无关,而比叶面积是关联性最强的性状,与所有器官的性状都有关联。再萌发能力也与多个性状相关。与能够通过两种方法重新萌发的物种相比,能够通过基部重新萌发而非外植体重新萌发的物种平均更短、更粗壮、茎边材密度更高、树皮更薄、叶片更小、比叶面积更低。分类群与其近缘种相似;除相对高度外,所有连续性性状的系统发育信号都很显著,从帕格尔λ = 0.37(相对树皮厚度)到λ = 0.82(比叶面积)不等。系统进化分析表明,大多数(但不是全部)性状对的相关性减弱。然而,性状相关网络上的大多数中等关系也显示出相关进化。结论桉树的株型、茎、叶和生殖性状与火灾反应在某种程度上是相互协调的,主要是通过叶片经济学来协调。在当今条件下赋予桉树类群生态能力的性状组合很可能在整个进化史中同样受到青睐。影响这支持了植物协调策略的理论。
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From mallees to mountain ash, specific leaf area is coordinated with eucalypt tree stature, resprouting, stem construction, and fruit size
Context

The radiation of eucalypts into almost every Australian environment offers valuable insights to plant ecological strategies.

Aims

We aimed to assess the degree to which functional traits across different organs are independent or reflect coordinated strategies in southern eucalypts.

Methods

We applied ordinary and phylogenetic generalised least squares regressions to 164 southern Australian taxa, examining the network of pairwise relationships between 10 functional traits representing aspects of stature, leaf economics, reproduction and post-fire regeneration. We examined coordination and modularity in this network and estimated how phylogeny affects observed trait correlations.

Results

Stem and stature traits were generally independent of reproductive traits, with Specific Leaf Area the most connected trait, being correlated with traits from all organs. Resprouting ability was also connected to several traits. Species able to resprout basally, but not epicormically, were on average shorter, stouter, with higher stem sapwood density, thinner bark, smaller leaves and lower Specific Leaf Area than those able to resprout using both methods. Taxa resembled their relatives; phylogenetic signal was significant for all continuous traits except Relative Height, ranging from Pagel’s Lambda λ = 0.37 (Relative Bark Thickness) to λ = 0.82 (Specific Leaf Area). Phylogenetic analyses showed weakened correlations for most (but not all) trait pairs. However, most moderate relationships on the trait correlation network also displayed correlated evolution.

Conclusions

Stature, stem, leaf and reproductive traits and fire response of eucalypts are somewhat coordinated, principally through leaf economics. Trait combinations that confer ecological competence on eucalypt taxa in present-day conditions are likely to have been similarly favoured throughout their evolutionary history.

Implications

This supports theory of coordinated plant strategies.

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来源期刊
Australian Journal of Botany
Australian Journal of Botany 生物-植物科学
CiteScore
2.30
自引率
18.20%
发文量
26
审稿时长
6-12 weeks
期刊介绍: Australian Journal of Botany is an international journal for publication of original research in plant science. We seek papers of broad interest with relevance to Southern Hemisphere ecosystems. Our scope encompasses all approaches to understanding plant biology. Australian Journal of Botany is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
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