The basis of differentiation between sun and shade leaves is related to different light intensiti... more The basis of differentiation between sun and shade leaves is related to different light intensities. In order to understand the adaptability of the leaves of Rhizophora mangle L., associated with different lighting conditions, leaves were collected from the upper peripheral six individuals (sun leaves) and the lower region of the same internal (shade leaves). The variables analyzed leaf thickness, palisade parenchyma, adaxial and abaxial epidermis, adaxial and abaxial cuticle, stomatal density and index. Measurements were made ??on microscope equipped with ocular micrometer. Sun leaves were lower and with more xeromorphic characteristics, such as increased thickness of the cuticle and the adaxial and abaxial epidermis. The palisade parenchyma and limbus showed up thicker than shade leaves, with no significant difference between the cuticle of the abaxial surface. It was also observed a higher frequency of stomata per mm², an average of 70/mm², while shade leaves showed 47/mm², with no differences between length and width. Differences between the sun leaves and shade leaves indicate adaptive capacity of this species to remain active at different light conditions.
The wood anatomy of Huberia consimilis, Miconia amoena, M. mirabilis, M. rimalis and Tibouchina f... more The wood anatomy of Huberia consimilis, Miconia amoena, M. mirabilis, M. rimalis and Tibouchina francavillana (Melastomataceae) is described and compared with other species from the same genera. All taxa share vestured pits, absent or inconspicuous growth rings, septate fibres, parenchyma-like tangential bands, and fibres shorter than 900 μm which is characteristic of the family Melastomataceae. Each species exhibited a set of wood anatomical characteristics that enabled its identification. Some traits were more relevant in distinguishing genera, such as composition of parenchyma-like tangential bands, vessel-ray pits, ray width, rays per millimetre and fibre length. Parenchyma-like tangential bands are described in great detail, and we propose a more specific nomenclature for their anatomical classification.
The ability of individuals to adjust its performance and structure in response to changing env... more The ability of individuals to adjust its performance and structure in response to changing environmental conditions is an attribute that occurs in species that have plasticity, a characteristic that is very important for the survival of a species. The plasticity can occur both between plants of different populations as well as between leaves of the same individual. The aim of this study was to compare the leaf anatomy of two populations of Clusia obdeltifolia Bittrich collected in two distinct altitudes in an area of rocky fields in Pai Inácio, Palmeiras, Bahia, Brazil. Paradermic and transverse sections of the leaves were done and density and stomatal index, leaf area, epidermal thickness in the adaxial and abaxial, cuticle thickness on both sides, hypodermis, palisade and spongy parenchyma were measured. Anatomical variations in leaf structure were observed among individuals of both populations indicating significant differences between the two populations. Specimens collected at higher altitude showed higher scleromorphism, smaller leaf area, higher stomatal density, increased thickness of adaxial and abaxial epidermis, cuticle thicker and more elongated cells in the palisade parenchyma. This phenotypic plasticity observed in the leaf of C. obdeltifolia, is related to the environmental conditions in which the plants occur.
The basis of differentiation between sun and shade leaves is related to different light intensiti... more The basis of differentiation between sun and shade leaves is related to different light intensities. In order to understand the adaptability of the leaves of Rhizophora mangle L., associated with different lighting conditions, leaves were collected from the upper peripheral six individuals (sun leaves) and the lower region of the same internal (shade leaves). The variables analyzed leaf thickness, palisade parenchyma, adaxial and abaxial epidermis, adaxial and abaxial cuticle, stomatal density and index. Measurements were made ??on microscope equipped with ocular micrometer. Sun leaves were lower and with more xeromorphic characteristics, such as increased thickness of the cuticle and the adaxial and abaxial epidermis. The palisade parenchyma and limbus showed up thicker than shade leaves, with no significant difference between the cuticle of the abaxial surface. It was also observed a higher frequency of stomata per mm², an average of 70/mm², while shade leaves showed 47/mm², with no differences between length and width. Differences between the sun leaves and shade leaves indicate adaptive capacity of this species to remain active at different light conditions.
The wood anatomy of Huberia consimilis, Miconia amoena, M. mirabilis, M. rimalis and Tibouchina f... more The wood anatomy of Huberia consimilis, Miconia amoena, M. mirabilis, M. rimalis and Tibouchina francavillana (Melastomataceae) is described and compared with other species from the same genera. All taxa share vestured pits, absent or inconspicuous growth rings, septate fibres, parenchyma-like tangential bands, and fibres shorter than 900 μm which is characteristic of the family Melastomataceae. Each species exhibited a set of wood anatomical characteristics that enabled its identification. Some traits were more relevant in distinguishing genera, such as composition of parenchyma-like tangential bands, vessel-ray pits, ray width, rays per millimetre and fibre length. Parenchyma-like tangential bands are described in great detail, and we propose a more specific nomenclature for their anatomical classification.
The ability of individuals to adjust its performance and structure in response to changing env... more The ability of individuals to adjust its performance and structure in response to changing environmental conditions is an attribute that occurs in species that have plasticity, a characteristic that is very important for the survival of a species. The plasticity can occur both between plants of different populations as well as between leaves of the same individual. The aim of this study was to compare the leaf anatomy of two populations of Clusia obdeltifolia Bittrich collected in two distinct altitudes in an area of rocky fields in Pai Inácio, Palmeiras, Bahia, Brazil. Paradermic and transverse sections of the leaves were done and density and stomatal index, leaf area, epidermal thickness in the adaxial and abaxial, cuticle thickness on both sides, hypodermis, palisade and spongy parenchyma were measured. Anatomical variations in leaf structure were observed among individuals of both populations indicating significant differences between the two populations. Specimens collected at higher altitude showed higher scleromorphism, smaller leaf area, higher stomatal density, increased thickness of adaxial and abaxial epidermis, cuticle thicker and more elongated cells in the palisade parenchyma. This phenotypic plasticity observed in the leaf of C. obdeltifolia, is related to the environmental conditions in which the plants occur.
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