Leaf epidermal cell size in trees: developmental possibilities stay wide with height growth in two angiosperm tree species.

IF 5.7 2区 生物学 Q1 PLANT SCIENCES
G Alemán-Sancheschúlz, M E Olson, J A Rosell, I H Salgado-Ugarte, Aaron Potkay, A I Pérez-Maussán
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引用次数: 0

Abstract

Tree height varies across environments, with taller individuals found in cool, moist habitats and shorter trees in drier regions. Within species, trees can exhibit height variation due to environmental factors such as drought-induced dieback. A key question is what drives changes in leaf structure with increasing height-whether some trait values cannot be produced under the developmental conditions at treetops or whether differences arise because natural selection favors particular trait values at different canopy positions. Some hypotheses suggest that increasing height imposes "limits" on mature leaf traits, making some structural changes developmentally inevitable. However, selection could also favor structural changes within wide fields of developmentally possible trait configurations. We examined leaf epidermal cell size distributions in Bursera simaruba and Eucalyptus camaldulensis from seedlings to maximum tree heights in situations in which seedlings to adults were all exposed to full sun and thus had all "sun" leaves. We found that in general cell sizes increased, variance remained high, and distributions did not systematically shift with height. These results indicate that, rather than reflecting a developmental inability to produce certain leaf epidermal cell sizes at greater heights, the patterns we observed are better explained by selection simply favoring some cell sizes from among the many that development can produce.

树木的叶表皮细胞大小:两种被子植物树种的发育可能性随高度的增长而扩大。
树木的高度因环境的不同而不同,在凉爽潮湿的栖息地,树木较高,而在干燥地区,树木较矮。在物种内,由于环境因素,如干旱引起的枯死,树木可以表现出高度变化。一个关键的问题是,是什么驱动了叶片结构随着高度的增加而发生变化——是一些性状值不能在树梢的发育条件下产生,还是由于自然选择在不同的冠层位置偏爱特定的性状值而产生差异。一些假说认为,高度的增加对成熟叶片性状施加了“限制”,使一些结构变化在发育中不可避免。然而,选择也可能有利于在发育可能的性状配置的广泛领域内的结构变化。在树苗到成虫都暴露在充足阳光下的情况下,我们研究了从树苗到最大树高的Bursera simaruba和camaldulensis叶子表皮细胞的大小分布。我们发现,在一般情况下,细胞大小增加,方差仍然很高,分布不随高度系统地变化。这些结果表明,我们观察到的模式,不是反映了发育上无法在更高的高度产生特定的叶表皮细胞大小,而是更好地解释了选择只是在发育可以产生的许多细胞中偏爱某些细胞大小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Experimental Botany
Journal of Experimental Botany 生物-植物科学
CiteScore
12.30
自引率
4.30%
发文量
450
审稿时长
1.9 months
期刊介绍: The Journal of Experimental Botany publishes high-quality primary research and review papers in the plant sciences. These papers cover a range of disciplines from molecular and cellular physiology and biochemistry through whole plant physiology to community physiology. Full-length primary papers should contribute to our understanding of how plants develop and function, and should provide new insights into biological processes. The journal will not publish purely descriptive papers or papers that report a well-known process in a species in which the process has not been identified previously. Articles should be concise and generally limited to 10 printed pages.
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