Convergent morphology and anatomy in the microphyllous leaves of selected heathland Myrtaceae and Asteraceae

IF 2.1 3区农林科学 Q2 FORESTRY Trees Pub Date : 2023-06-16 DOI:10.1007/s00468-023-02422-4

Veit M. Dörken, Philip G. Ladd, Robert F. Parsons

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引用次数: 1

Key message

We examined leaves of a suite of microphyllous woody plants and describe a little-known form of leaf peltation for the first time and also investigate strongly reflexed leaves in two distantly related lineages.

Abstract

Plants cope with a range of environmental conditions, especially related to water relations, and have developed an array of physiological and structural solutions to maintain a functional water balance. There has been considerable recent work on physiological solutions to water deficit but little attention paid to leaf characteristics. In many species there is a change in leaf form from seedlings to adults. We examine such changes in several small-leaved species from the distantly related Asteraceae and Myrtaceae, some of which develop micropeltate or reflexed leaves as adults. All are native to dry or seasonally dry sites. Three major morphological groups were recognised as follows: (1) leaves erect, nonpeltate and scale-like (Ozothamnus hookeri), (2) leaves erect and peltate (Phaenocoma prolifera, Regelia inops), (3) Leaves reflexed (Olearia lepidophylla, Ozothamnus scutellifolius, Ozothamnus reflexifolius, Melaleuca diosmifolia). The microphyllous peltation in P. prolifera and R. inops in the absence of a meristematic fusion/bridge differs from typically peltate leaves. These small-leaved taxa occur in open, high light environments which are very different from the mesic, shaded understorey habitats of typical peltate-leaved plants. Many small-leaved species have leaves closely appressed to the stem and often with recurved margins. The erect leaves are functionally similar to reflexed leaves. Environmental filtering leads to superficially similar plant forms that may have somewhat different ontological origins. Such morphological forms are examples of convergent evolution in distantly related species but within each family are likely phylogenetically related.

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石南科和紫金桃科植物小叶状叶的趋同形态和解剖

我们研究了一组小叶木本植物的叶片，首次描述了一种鲜为人知的叶片造化形式，并研究了两个远亲谱系中的强反射叶片。摘要植物应对一系列的环境条件，特别是与水的关系，并发展出一系列生理和结构解决方案来维持功能性的水平衡。近年来对水分亏缺的生理解决方法进行了大量的研究，但对叶片特性的研究却很少。在许多物种中，从幼苗到成虫的叶片形态都有变化。我们研究了来自远亲菊科和桃金桃科的几个小叶物种的这种变化，其中一些在成年时发育微叶或反折叶。所有植物都生长在干燥或季节性干燥的地方。主要有3个形态类群:(1)叶片直立、无盾状、鳞片状(Ozothamnus hookeri)，(2)叶片直立、盾状(Phaenocoma prolifera, Regelia inops)，(3)叶片反折(Olearia lepidophylla, Ozothamnus scutellifolius, Ozothamnus reflexifolius，千层莲)。在没有分生融合/桥接的情况下，白杨和白杨的小叶状叶形成与典型的叶状叶不同。这些小叶分类群生长在开阔、高光的环境中，与典型的盆底叶植物的复盖、遮荫的林下生境有很大的不同。许多小叶种的叶紧密贴压在茎上并且通常具有下弯的边缘。直立叶片在功能上与反折叶片相似。环境过滤导致表面上相似的植物形式，可能有一些不同的本体论起源。这种形态形式是近亲物种趋同进化的例子，但在每个科内可能都是系统发育相关的。

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来源期刊

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

期刊介绍： Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.