ANÁLISE DA INFLUÊNCIA LUMINOSA NOS ASPECTOS ANATÔMICOS DE FOLHAS DE&lt;i&gt; Theobroma speciosum &lt;/i&gt;WILLD EX SPRENG. (MALVACEAE)

Dardengo, Juliana de Freitas Encinas; Rossi, Ana Aparecida Bandini; Silva, Ivone Vieira da; Pessoa, Marcos José Gomes; Silva, Carolina Joana da

doi:10.5902/1980509828634

Cited by 9 publications

(9 citation statements)

References 7 publications

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“…(Donato & Morretes, 2009). In this regard, other studies also have observed that the mesophyll of leaves exposed to high light intensity was thicker than leaves exposed to low light (Klich, 2000;Hanba, Kogami, & Terashima, 2002;Oguchi et al, 2003;Dardengo et al, 2017). Larger areas of the mesophyll cells is a way to use water efficiently with a greater capture of CO 2 than loss of water during transpiration (Smith et al, 1997), which corroborates with the present research when leaf was in the shade, but there was no water.…”

Section: Environmental Influencesupporting

confidence: 90%

“…Leaf is the plant organ commonly used in ecological studies which may easily respond to environmental changes (Wyka, Robakowski, & Zytkowiak, 2007). Leaf tissues such as chlorenchyma, epidermis, parenchyma as well as vascular bundles may undergo phenotypic plasticity and register the influence of abiotic factor on plants (Dardengo, Rossi, Silva, Pessoa, & Silva, 2017;Devi et al, 2017;Lemos et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Environmental Influence on the Leaf Morphoanatomical Characteristics of Myrcia splendens (Sw.) DC. (Myrtaceae)

Costa

Coutinho

Bonilla

et al. 2020

Rev. Bras. Geog. Fis.

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Myrcia splendens (Sw.) DC. is a native and endemic species of Brazil. Plants can have ecological plasticity due to environmental influences and studies on the ecological anatomy of leaves in the genus Myrcia DC. are scarce. In this sense, the present study aimed to verify the effect of seasonality and luminosity on the leaf morphoanatomical characteristics of Myrcia splendens (Sw.) DC., in order to contribute with information about the species responses to the natural abiotic factors of its occurrence. The botanical material for the study was collected in the São Gonçalo do Amarante Botanic Garden, Ceará, in the rainy and dry seasons, fully expanded leaves exposed to the sun and shade, which were subsequently subjected to laboratory procedures to obtain the paradermal and cross sections of the leaves, in order to verify how Myrcia splendens (Sw.) DC. responds to seasonal variations in the availability of water and light in a coastal environment. As a result, most leaf structures of Myrcia splendens (Sw.) DC. presented greater thicknesses, areas or densities when in the dry season (water deficit) and submitted to intense sunlight, that is, in more stressful environmental conditions. Therefore, it's concluded that the changes in the anatomy of Myrcia splendens (Sw.) DC. demonstrated the acclimatization of the leaves in response to abiotic factors (water and light), thus contributing to the survival of the species in the Vegetation Complex of the Coastal Zone of Ceará.

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Section: Environmental Influencesupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Environmental Influence on the Leaf Morphoanatomical Characteristics of Myrcia splendens (Sw.) DC. (Myrtaceae)

Costa

Coutinho

Bonilla

et al. 2020

Rev. Bras. Geog. Fis.

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“…The thickness of the median vein was higher in shaded environments, a fact not verified in the work of Dardengo et al (2017). The greater petiole length in shadow leaves found for the species under study may be because this structure aids in the projection of leaves for greater light absorption (LARCHER;.…”

Section: Quantitative Characteristicsmentioning

confidence: 76%

Ecological anatomy of Eugenia punicifolia (Kunth) DC. (MYRTACEAE) in the restinga region,state of Ceará

et al. 2019

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The species Eugenia punicifolia (Kunth) DC. (myrtle) occurs in the coastal region of the state of Ceará and has ecological and medicinal importance. This study aimed to characterize the leaf anatomy of myrtle (E. punicifolia) in the rainy and dry seasons, as well as in the sun and shade in the restinga region of the state of Ceará and to contribute to the understanding of the morphoanatomic variations in response to the natural conditions of the occurrence of this species. For this, collections of fully expanded leaves were performed at the Botanical Park of Ceará and fixed in FAA70, being replaced by 70% ethanol after 24 hours. The usual anatomical procedures were then performed in order to qualitatively and quantitatively analyze the leaf blade, petiole and epidermis structures. As a result, it was found that myrtle has xeromorphic characteristics such as thick cuticle, hypoestomatic leaf and sclerenchyma fibers in the median vein vascular bundles. It was concluded that E. punicifolia has great plasticity to adjust well under the analyzed conditions.

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“…The different luminous environments influenced the physiological and anatomical parameters. Several authors have observed the effect of luminosity on these parameters in tree species (Larcher et al, 2015;Felsemburgh et al, 2016;Dardengo et al, 2017), and Guazuma ulmifolia is considered a pioneer species tolerant to greater light (Lorenzi, 1992). We observed that G. ulmifolia showed characteristics such as increased photosynthetic rate, stomatal conductance and anatomical features such as thickness of parenchyma tissues, which refer to pioneer species tolerant to high light (Aragão et al, 2014;Dardengo et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…The greater thickness of palisade parenchyma is important to avoid photoinhibition in leaves with exposure to greater light intensity (Taiz & Zeiger, 2006). The ratio of spaces area of spongy parenchyma to total area of same parenchyma in shadow leaflets allows for a greater use of light incident on the lower internal portion (Dardengo et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Organization of leaf vascular system and gas exchange in seedlings of Guazuma ulmifolia Lam. in different light conditions

et al. 2021

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In tropical forests, different physiological characteristics of leaves in tree species are evidenced by variations in different incident light conditions. We aim to evaluate gas exchange and organization of leaf vascular system in Guazuma ulmifolia Lam. seedlings under different light conditions. Seedlings were obtained from seeds germinated under greenhouse conditions with controlled environment. Ninety days after germination, seedlings in 8kg pots were transferred to the experimental site to allow acclimatization under sun and shade conditions. The experimental design was completely randomized, with two treatments: full sunlight and artificial shading, limiting the luminosity to about 5% of irradiance. Seedlings were maintained under these conditions for 120 days before measuring gas exchange parameters. We measured photosynthetic rate, stomatal conductance, sub-stomatic CO2 concentration, transpiration, and chlorophyll content. Anatomical analysis measured distance between veins, distance from veins to abaxial epidermis, distance from veins to adaxial epidermis, distance from veins to stomata, total leaf thickness, abaxial epidermis thickness, adaxial epidermis thickness, palisade parenchyma thickness, and spongy parenchyma thickness of foliar gas exchange of G. ulmifolia which presented significant differences between light environments. Photosynthetic rate and stomatal conductance were reduced by 78% and 39%, respectively, in shade, while stomatal conductance increased by 31% in full sunlight. Transpiration showed no significant difference between the two treatments, but chlorophyll content was 30% lower in full sunlight. Distance between veins and distance from veins to stomata showed no difference between treatments, but the other parameters increased in full sunlight. Thus, the results showed that the pioneer species G. ulmifolia presented leaf gas exchange acclimated to environments with high luminosity.

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ANÁLISE DA INFLUÊNCIA LUMINOSA NOS ASPECTOS ANATÔMICOS DE FOLHAS DE<i> Theobroma speciosum </i>WILLD EX SPRENG. (MALVACEAE)

Cited by 9 publications

References 7 publications

Environmental Influence on the Leaf Morphoanatomical Characteristics of Myrcia splendens (Sw.) DC. (Myrtaceae)

Environmental Influence on the Leaf Morphoanatomical Characteristics of Myrcia splendens (Sw.) DC. (Myrtaceae)

Ecological anatomy of Eugenia punicifolia (Kunth) DC. (MYRTACEAE) in the restinga region,state of Ceará

Organization of leaf vascular system and gas exchange in seedlings of Guazuma ulmifolia Lam. in different light conditions

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