Variations in morphological and epidermal features of shade and sun leaves of two species: Quercus bambusifolia and Q. myrsinifolia
Variations in morphological and epidermal features of shade and sun leaves of two species: Quercus bambusifolia and Q. myrsinifolia
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两种树种：竹叶栎和香栎树荫叶和阳叶形态和表皮特征的变化
DOI：
10.1002/ajb2.1706
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发表时间：
2021
影响因子：
3
通讯作者：
Jin Jian-Hua
中科院分区：
文献类型：
--
作者：
Maslova Natalia P.;Karasev Eugeny V;Xu Sheng-Lan;Spicer Robert A.;Liu Xiao-Yan;Kodrul Tatiana M.;Spicer Teresa E. V;Jin Jian-Hua
树冠内部和外围的小气候差异导致了各种适应性的叶片宏观形态和解剖特征。我们的研究旨在揭示标准的太阳/阴叶鉴定两种万年青橡树，适用于现代和化石叶。并与其他物种的结果进行了比较。Myrsinifolia（青冈组），来自具有发育良好的树冠的单个成熟树木的叶子收集在中国广州华南植物园。我们专注于化石材料中经常保存的叶子特征。SVGm软件用于宏观形态学测量。进行定量分析，并使用R软件和IDE Rstudio生成箱形图。采用传统的植物学技术制备叶curemus。ResultsPrincipal characteristics用于区分遮荫和阳光叶在所研究的橡树被确定为叶片的长度与宽度比（L/W），和脉序网络的发展程度。对于Q。myrsinifolia、阴生叶和阳生叶在齿形态和齿叶片长度与总叶片长度的比率上不同。表皮的主要特征是普通的细胞大小和垂周壁轮廓。对于这两个物种来说，阴叶的可塑性超过阳叶的可塑性。结论所研究的橡树对阳光和阴影的形态反应与其他植物属相似，这为识别常见的叶子多态性提供了有用的概括，在确定现代植物和化石植物的分类位置时必须考虑这些多态性。
PremiseMicroclimatic differences between the periphery and the interior of tree crowns result in a variety of adaptive leaf macromorphological and anatomical features. Our research was designed to reveal criteria for sun/shade leaf identification in two species of evergreen oaks, applicable to both modern and fossil leaves. We compared our results with those in other species similarly studied.MethodsFor bothQuercus bambusifoliaandQ. myrsinifolia(sectionCyclobalanopsis), leaves from single mature trees with well‐developed crowns were collected in the South China Botanical Garden, Guangzhou, China. We focus on leaf characters often preserved in fossil material. SVGm software was used for macromorphological measurement. Quantitative analyses were performed and box plots generated using R software with IDE Rstudio. Leaf cuticles were prepared using traditional botanical techniques.ResultsPrincipal characters for distinguishing shade and sun leaves in the studied oaks were identified as leaf lamina length to width ratio (L/W), and the degree of development of venation networks. ForQ. myrsinifolia, shade and sun leaves differ in tooth morphology and the ratio of toothed lamina length to overall lamina length. The main epidermal characters are ordinary cell size and anticlinal wall outlines. For both species, plasticity within shade leaves exceeds that of sun leaves.ConclusionsMorphological responses to sun and shade in the examined oaks are similar to those in other plant genera, pointing to useful generalizations for recognizing common foliar polymorphisms that must be taken into account when determining the taxonomic position of both modern and fossil plants.