Anatomy and growth of the epiphytic cactus Epiphyllum phyllanthus under different radiation conditions

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-03-04 DOI:10.1080/17550874.2022.2078245

M. P. B. Chaves, B. A. Silva, Heloisa F. Silvério, F. Ramos, V. Duarte, E. M. Castro, F. J. Pereira

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Abstract

ABSTRACT Background Plants develop mechanisms that confer tolerance to sun or shade exposure and the knowledge of their responses may help to devise strategies for the conservation of natural populations and their propagation. Aims We study the effect of shading on the ecophysiology and anatomy of Epiphyllum phyllanthus to determine its plasticity and tolerance. Methods Specimens of E. phyllanthus were subjected to full sun, 35%, 75%, and 85% shading for 60 days. The growth characteristics, phylloclade anatomy and water content in the plants were quantified and compared. Results All individuals subjected to full sun and 35% shading had died. A shading of 85% produced the highest fresh and dry mass of the stems. Higher shading caused no effect in the allocation of biomass to stems or roots or on the relative growth rate, net assimilation rate, leaf area ratio or water content. The thickness of the phylloclade increased with increased shading. The highest stomatal density on both surfaces was observed in the treatment with 75% shading. Conclusion E. phyllanthus is a sciophytic plant that requires shade to survive. Its main strategy appears to be the greater accumulation of water in its phylloclade under more shaded conditions, which stimulates plant growth.

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不同辐射条件下附生仙人掌的解剖与生长

摘要背景植物发展出对阳光或阴影暴露具有耐受性的机制，了解它们的反应可能有助于制定保护自然种群及其繁殖的策略。目的研究遮荫对叶下珠生态生理和解剖结构的影响，以确定其可塑性和耐受性。方法将叶下珠标本分别置于35%、75%和85%的遮光条件下60天。对植物的生长特性、叶枝解剖和含水量进行了定量和比较。结果所有受阳光照射和35%遮荫的个体均已死亡。85%的遮荫产生了最高的新鲜和干燥茎质量。较高的遮荫对生物量向茎或根的分配或相对生长速率、净同化率、叶面积比或含水量没有影响。叶枝的厚度随着遮荫的增加而增加。在遮光75%的处理中，观察到两个表面的气孔密度最高。结论叶下珠是一种需要遮荫才能生存的接生植物。它的主要策略似乎是在更荫蔽的条件下，在其叶枝中积累更多的水分，从而刺激植物生长。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.