Variabilidade fenotípica de Rumohra adiantiformis (G. Forst) Ching (Dryopteridaceae)

Boeger, Maria Regina Torres; Cavichiolo, Leticia Estela; Pil, Maria Whilhelmina; Labiak, Paulo H.

doi:10.1590/s2236-89062007000400009

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…On the other hand, the amphistomatic type observed in leaves of L. racemosa are considered common in xeric (Fahn & Cutler, 1992) and also in thick leaves ( > 0.5 mm) Boeger, Cavichiolo, Pil, & Labiak, 2007). Leaf thickness imposes a limitation on the inner diffusion of gases due to the greater distance through the mesophyll.…”

Section: Discussionmentioning

confidence: 99%

Leaf morphological strategies of seedlings and saplings of Rhizophora mangle (Rhizophoraceae), Laguncularia racemosa (Combretaceae) and Avicennia schaueriana (Acanthaceae) from Southern Brazil

Pelozo

Boeger

Sereneski-de-Lima

et al. 2016

RBT

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Abstract:The initial phase of a plant life cycle is a short and critical period, when individuals are more vulnerable to environmental factors. The morphological and anatomical study of seedlings and saplings leaf type enables the understanding of species strategies of fundamental importance in their establishment and survival. The objective of this study was to analyze the structure of seedlings and saplings leaf types of three mangrove species, Avicennia schaueriana, Laguncularia racemosa, Rhizophora mangle, to understand their early life adaptive strategies to the environment. A total of 30 fully expanded cotyledons (A. schaueriana and L. racemosa), 30 leaves of seedlings, and 30 leaves of saplings of each species were collected from a mangrove area in Guaratuba Bay, Paraná State, Brazil. Following standard methods, samples were prepared for morphological (leaf dry mass, density, thickness) and anatomical analysis (epidermis and sub-epidermal layers, stomata types, density of salt secretion glands, palisade and spongy parenchyma thickness). To compare leaf types among species one-way ANOVA and Principal Component Analysis were used, while Cluster Analysis evaluated differences between the species. We observed significant structural differences among species leaf types. A. schaueriana showed the thickest cotyledons, while L. racemosa presented a dorsiventral structure. Higher values of the specific leaf area were observed for seedlings leaves of A. schaueriana, cotyledons of L. racemosa and saplings leaves of A. schaueriana and R. mangle. Leaf density was similar to cotyledons and seedlings leaves in A. schaueriana and L. racemosa, while R. mangle had seedlings leaves denser than saplings. A. schaueriana and R. mangle showed hypostomatic leaves, while L. racemosa amphistomatic; besides, A. chaueriana showed diacytic stomata, while L. racemosa anomocytic, and R. mangle ciclocytic. Seedling leaves were thicker in R. mangle (535 µm) and L. racemosa (520 µm) than in A. schaueriana (470.3 µm); while saplings leaves were thicker in L. racemosa

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Section: Discussionmentioning

confidence: 99%

Leaf morphological strategies of seedlings and saplings of Rhizophora mangle (Rhizophoraceae), Laguncularia racemosa (Combretaceae) and Avicennia schaueriana (Acanthaceae) from Southern Brazil

Pelozo

Boeger

Sereneski-de-Lima

et al. 2016

RBT

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“…These two species have morpho-physiological characteristics that probably enable their survival in the restrictive conditions of restinga. Rumohra adiantiformis, for example, can survive in areas of high incidence of light and low water availability due to reduced leaf area, greater mesophyll thickness and frond inclination (Boeger et al 2007), while smaller size and higher frequency of stomata enable the survival of T. serrulatum in flooded areas (Rolleri et al 2010).…”

Section: Discussionmentioning

confidence: 99%

The predominant role of soil in determining species composition of fern communities in subtropical coastal forest ecosystems

Carmes¹,

Dechoum²,

Fiaschi³

2019

NBC

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Ferns are an important component in the understorey of tropical forests and their distribution is influenced by several biotic and abiotic factors. At a regional scale, soil characteristics and canopy openness play an important role in fern species composition and richness, as well as in the abundance of individuals. Our objective was to compare the influence of edaphic conditions and vegetation structure on the abundance and distribution of fern communities in Atlantic forest and restinga forest. Our hypotheses were that fern species richness and diversity are higher in Atlantic forest than in restinga due to limiting conditions in this habitat and the composition of fern species in Atlantic forest differs from restinga, especially due to differences in edaphic conditions. A principal coordinates analysis was applied to ordinate sampling units in relation to the environmental variables and a permutational multivariate analysis of variance was used to test that environmental variables did not differ between the two vegetation types. Species richness was compared using rarefaction curves. The influence of abiotic variables in species composition and abundance was verified using canonical correspondence analysis. No differences were observed in species richness, diversity or dominance between vegetation types, although abundance was higher in restinga. Fern communities respond to edaphic conditions and vegetation structure variations between vegetation types, the soil playing a major role. A greater variety of habitats resulting from differences in soil drainage in restinga facilitates the co-existence of species with different ecological tolerance, increasing local diversity and compensating for limiting conditions in restinga.

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“…The presence of thicker epidermis and mesophyll in leaflets of plants from such vegetation-type may have been influenced by some environmental factors, such as the low nutrient content in the soil, the frequency of fire in the area, in addition to high light intensity and high temperatures, can also lead to pronounced loss of water. According to Boeger & Gluzezak (2006) and Boeger et al (2007), some plants are likely to make some morphological adjustments that enable them to maintain their physiological processes, thus ensuring successful occupation in different habitats.…”

Section: Discussionmentioning

confidence: 99%

Anatomy and micromorphometry of Caryocar brasiliense leaves

et al. 2015

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The current study aims to study the anatomy and micromorphometry of C. brasiliense leaves in three Cerrado (savanna) vegetation-types: dense, typical and sparse) -in the municipality of Porto Nacional-TO. Samples were collected, fixed and stored in alcohol 70%. Transverse, longitudinal and paradermal sections of the median leaflet were prepared for anatomical and micromorphometric studies using standard techniques. C. brasiliense leaflets show uniestratified epidermis covered by thick cuticle on the adaxial surface and by paracytic stomata and multicellular non-glandular trichomes on the abaxial surface. The mesophyll is formed by two or three layers of palisade parenchyma adaxially and spongy parenchyma abaxially. The vascular bundle is of the collateral type and the accessory bundles show a sheath extending into the epidermides. The micromorphometric analyses pointed to significant differences in the thickness of both adaxial epidermis and spongy parenchyma in all specimens from the three vegetation-types. The highest averages were found in the leaflets of sparse cerrado plants, suggesting that environmental factors may have an influence over the plants morphological responses. Key words: Caryocaraceae, Micromorphometry, Pequi, Morphology. ResumoO objetivo do trabalho foi caracterizar anatômica e micromorfometricamente folhas de C. brasiliense em três fitofisionomias do Cerrado (denso, típico e ralo), no município de Porto Nacional-TO. Amostras foram coletadas, fixadas e armazenadasestocadas em álcool 70%. Utilizando técnicas usuais para estudos em anatomia vegetal, foram obtidas secções transversais, longitudinais e paradérmicas do folíolo mediano para estudos anatômicos e micromorfométricos. Os folíolos de C. brasiliense apresentaram epiderme uniestratificada, recoberta por cutícula espessa na face adaxial e por estômatos paracíticos e tricomas tectores pluricelulares na face abaxial. O mesofilo é formado por duas a três camadas de parênquima paliçádico na face adaxial e esponjoso na abaxial. O feixe vascular é do tipo colateral, com demais feixes acessórios apresentando bainha que se estende até a epiderme. As análises micromorfométricas revelaram diferenças significativas na espessura da epiderme adaxial e do parênquima esponjoso em todas as plantas estudadas para cada uma das três fitofisionomias, sendo as médias mais elevadas encontradas nos folíolos das plantas crescendo em Cerrado esparso. Isto sugere que a influência de fatores ambientais pode ter modulado respostas morfológicas nas plantas. Palavras-chave: Caryocaraceae, Micromorfometria, Pequi, Morfologia.

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Variabilidade fenotípica de Rumohra adiantiformis (G. Forst) Ching (Dryopteridaceae)

Cited by 5 publications

References 29 publications

Leaf morphological strategies of seedlings and saplings of Rhizophora mangle (Rhizophoraceae), Laguncularia racemosa (Combretaceae) and Avicennia schaueriana (Acanthaceae) from Southern Brazil

Leaf morphological strategies of seedlings and saplings of Rhizophora mangle (Rhizophoraceae), Laguncularia racemosa (Combretaceae) and Avicennia schaueriana (Acanthaceae) from Southern Brazil

The predominant role of soil in determining species composition of fern communities in subtropical coastal forest ecosystems

Anatomy and micromorphometry of Caryocar brasiliense leaves

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