Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga

Lenticels are pore-like structures, commonly originated in the substomatic cavity through a more intense meristematic activity of the phelogen. Unlike cork cells, which are tightly arranged and have suberified walls, lenticels are made up of cells with a rounded shape and delicate walls, a character...

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Autor principal:	Pereira, Mayara Luíza Alves
Outros Autores:	Ganade, Gislene Maria da Silva
Formato:	Dissertação
Idioma:	pt_BR
Publicado em:	Universidade Federal do Rio Grande do Norte
Assuntos:	Anatomia do caule Camada de oclusão Mudanças sazonais Anatomia funcional de lenticelas Crescimento secundário Anatomia da casca
Endereço do item:	https://repositorio.ufrn.br/handle/123456789/46547
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id	ri-123456789-46547
record_format	dspace
institution	Repositório Institucional
collection	RI - UFRN
language	pt_BR
topic	Anatomia do caule Camada de oclusão Mudanças sazonais Anatomia funcional de lenticelas Crescimento secundário Anatomia da casca
spellingShingle	Anatomia do caule Camada de oclusão Mudanças sazonais Anatomia funcional de lenticelas Crescimento secundário Anatomia da casca Pereira, Mayara Luíza Alves Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga
description	Lenticels are pore-like structures, commonly originated in the substomatic cavity through a more intense meristematic activity of the phelogen. Unlike cork cells, which are tightly arranged and have suberified walls, lenticels are made up of cells with a rounded shape and delicate walls, a characteristic that allows for the presence of large intercellular spaces, which are directly related to the known functions of these structures. Lenticels are present in a variety of organs and species of terrestrial plants, presenting distinct adaptations that help individuals to establish themselves in the face of changes in the environmental conditions experienced. Although lenticels were described two centuries ago, there are many gaps in knowledge involving these structures. This dissertation to clarify the importance of lenticels and understand how these structures occur in plant species from semiarid environments. The first chapter aims to carry out a literature review on lenticels in order to understand how different approaches and studies have been developed over time, also seeking to map specific fields of knowledge that still need to be filled. Specifically, we sought to: 1) Describe how lenticels occur in different phylogenetic groups of plants; 2) Describe in which plant structures the lenticels can be found; and 3) Describe the main functions, implications and structural adaptations given to lenticels. For this, we reviewed the specific literature through searches in scientific repositories, readings and cross-references. We found that lenticels are not exclusive to stems and roots, occurring in several organs, being present in species of monilophytes, gymnosperms and angiosperms. In addition to gas exchange, lenticels perform other functions, such as water absorption, also serving as transpiration points. These structures can respond to environmental stressors, showing adaptations to the environment. Although knowledge about lenticels has grown over the years, there are still gaps to be filled, especially in arid and semi-arid climates, since most studies published to date deal with plant species from wet and humid environments. In the second chapter, we aim to describe the morphology of the lenticels and stem of 14 woody species from the Caatinga, in order to search for possible morphological patterns and separate them into functional types. Specifically, we sought to: 1. Characterize the types of rhytidomas and pattern of occurrence of lenticels in the stem; 2. Describe the lenticel morphology and separate them into functional types according to their structural organization; 3. Describe the morphology of bark and wood in structural and functional terms. Individual samples were collected for each species and histological slides were prepared for anatomical description. Additionally, lenticels were analyzed using electron scanning microscopy and fresh material under stereomicroscope for descriptions of external morphology. We found a difference between the morphological characteristics of the lenticels, as well as the general morphology of the stem. We also observed two patterns of structural changes and construction of occlusion layers in the lenticels, which indicates at least two possible strategies adopted by species adapted to semi-arid conditions, suggesting that the lenticels of plant species can evolve distinct characteristics in response to drought. The presence of occlusion layers can favor species in seasonally dry tropical forests, reducing transpiration rates and also allowing gas exchange in the absence of leaves in deciduous and semi-deciduous species in the dry seasons.
author2	Ganade, Gislene Maria da Silva
author_facet	Ganade, Gislene Maria da Silva Pereira, Mayara Luíza Alves
format	masterThesis
author	Pereira, Mayara Luíza Alves
author_sort	Pereira, Mayara Luíza Alves
title	Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga
title_short	Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga
title_full	Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga
title_fullStr	Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga
title_full_unstemmed	Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga
title_sort	morfologia e função ecológica de lenticelas em espécies arbóreas da caatinga
publisher	Universidade Federal do Rio Grande do Norte
publishDate	2022
url	https://repositorio.ufrn.br/handle/123456789/46547
work_keys_str_mv	AT pereiramayaraluizaalves morfologiaefuncaoecologicadelenticelasemespeciesarboreasdacaatinga
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spelling	ri-123456789-465472022-05-02T15:22:17Z Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga Pereira, Mayara Luíza Alves Ganade, Gislene Maria da Silva http://lattes.cnpq.br/0421755634824568 http://lattes.cnpq.br/3024078007563102 Versieux, Leonardo de Melo 05070986686 http://lattes.cnpq.br/9905184321288831 Fontes, Clarissa Gouveia http://lattes.cnpq.br/2853176690029350 Marinho, Felipe Pereira http://lattes.cnpq.br/2510972877932677 Lichston, Juliana Espada http://lattes.cnpq.br/0727435909982933 Anatomia do caule Camada de oclusão Mudanças sazonais Anatomia funcional de lenticelas Crescimento secundário Anatomia da casca Lenticels are pore-like structures, commonly originated in the substomatic cavity through a more intense meristematic activity of the phelogen. Unlike cork cells, which are tightly arranged and have suberified walls, lenticels are made up of cells with a rounded shape and delicate walls, a characteristic that allows for the presence of large intercellular spaces, which are directly related to the known functions of these structures. Lenticels are present in a variety of organs and species of terrestrial plants, presenting distinct adaptations that help individuals to establish themselves in the face of changes in the environmental conditions experienced. Although lenticels were described two centuries ago, there are many gaps in knowledge involving these structures. This dissertation to clarify the importance of lenticels and understand how these structures occur in plant species from semiarid environments. The first chapter aims to carry out a literature review on lenticels in order to understand how different approaches and studies have been developed over time, also seeking to map specific fields of knowledge that still need to be filled. Specifically, we sought to: 1) Describe how lenticels occur in different phylogenetic groups of plants; 2) Describe in which plant structures the lenticels can be found; and 3) Describe the main functions, implications and structural adaptations given to lenticels. For this, we reviewed the specific literature through searches in scientific repositories, readings and cross-references. We found that lenticels are not exclusive to stems and roots, occurring in several organs, being present in species of monilophytes, gymnosperms and angiosperms. In addition to gas exchange, lenticels perform other functions, such as water absorption, also serving as transpiration points. These structures can respond to environmental stressors, showing adaptations to the environment. Although knowledge about lenticels has grown over the years, there are still gaps to be filled, especially in arid and semi-arid climates, since most studies published to date deal with plant species from wet and humid environments. In the second chapter, we aim to describe the morphology of the lenticels and stem of 14 woody species from the Caatinga, in order to search for possible morphological patterns and separate them into functional types. Specifically, we sought to: 1. Characterize the types of rhytidomas and pattern of occurrence of lenticels in the stem; 2. Describe the lenticel morphology and separate them into functional types according to their structural organization; 3. Describe the morphology of bark and wood in structural and functional terms. Individual samples were collected for each species and histological slides were prepared for anatomical description. Additionally, lenticels were analyzed using electron scanning microscopy and fresh material under stereomicroscope for descriptions of external morphology. We found a difference between the morphological characteristics of the lenticels, as well as the general morphology of the stem. We also observed two patterns of structural changes and construction of occlusion layers in the lenticels, which indicates at least two possible strategies adopted by species adapted to semi-arid conditions, suggesting that the lenticels of plant species can evolve distinct characteristics in response to drought. The presence of occlusion layers can favor species in seasonally dry tropical forests, reducing transpiration rates and also allowing gas exchange in the absence of leaves in deciduous and semi-deciduous species in the dry seasons. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq As lenticelas são estruturas semelhantes a poros, comumente originadas na cavidade subestomática através de uma atividade meristemática mais intensa do felogênio. Ao contrário das células da cortiça, compactamente arranjadas e de paredes suberificadas, as lenticelas são constituídas de células de formato arredondado e paredes delicadas, conferindo a presença de amplos espaços intercelulares, os quais estão diretamente relacionados às funções conhecidas para essas estruturas. As lenticelas estão presentes em uma variedade órgãos e espécies de plantas terrestres, apresentando adaptações distintas que auxiliam o estabelecimento dos indivíduos diante de mudanças nas condições ambientais experienciadas. Apesar das lenticelas terem sido descritas há dois séculos, existem muitas lacunas de conhecimento envolvendo essas estruturas. Essa dissertação busca esclarecer a importância das lenticelas e entender como estas estruturas ocorrem em espécies de plantas de ambientes semiáridos. O primeiro capítulo tem como objetivo realizar uma revisão de literatura sobre as lenticelas a fim de se entender como as diferentes abordagens e estudos vêm se desenvolvendo ao longo do tempo, procurando também mapear campos específicos de conhecimento que ainda precisam ser preenchidos. Especificamente, buscamos: 1) Descrever como se dá a ocorrência de lenticelas nos diferentes grupos filogenéticos das plantas; 2) Descrever em quais estruturas das plantas as lenticelas podem ser encontradas; e 3) Descrever as principais funções que são conferidas às lenticelas. Para isso, fizemos a revisão da literatura específica por meio de buscas em repositórios científicos, leituras e referências cruzadas. Constatamos que as lenticelas não são exclusivas de caules e raízes, ocorrendo em diversos órgãos, estando presentes em espécies de “pteridófitas” (monilófitas), gimnospermas e angiospermas. Além de trocas gasosas, as lenticelas desempenham outras funções, como absorção de água, servindo também como pontos de transpiração. Essas estruturas podem responder aos estressores ambientais, apresentando adaptações ao meio. Embora o conhecimento sobre lenticelas tenha crescido ao longo dos anos, ainda há lacunas a serem preenchidas, principalmente em climas áridos e semiáridos, visto que a maioria dos estudos publicados até os dias atuais tratam de espécies de plantas de ambientes alagados e úmidos. No segundo capítulo, buscamos descrever a morfologia das lenticelas e caule de 14 espécies lenhosas da Caatinga, de maneira a retratar possíveis padrões morfológicos e separá-las em tipos funcionais. Foram coletadas amostras de indivíduos para cada espécie e preparadas lâminas histológicas para descrição anatômica. Adicionalmente, as lenticelas foram analisadas através de microscopia eletrônica de varredura e material fresco sob estereomicroscópio para descrições da morfologia externa. Encontramos uma diferença entre as características morfológicas das lenticelas, assim como da morfologia geral do caule. Também observamos dois padrões de alternância estrutural e construção de camadas de oclusão nas lenticelas, o que indica ao menos duas possíveis estratégias adotadas pelas espécies adaptadas às condições semiáridas, sugerindo que as lenticelas de espécies vegetais podem evoluir características distintas em resposta à seca. A presença de camadas de oclusão pode favorecer as espécies em florestas tropicais sazonalmente secas, reduzindo as taxas de transpiração e ainda permitindo trocas gasosas na ausência de folhas em espécies decíduas nas estações secas. 2022-03-14T18:16:42Z 2022-03-14T18:16:42Z 2021-08-31 masterThesis PEREIRA, Mayara Luíza Alves. Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga. 2021. 78f. Dissertação (Mestrado em Ecologia) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2021. https://repositorio.ufrn.br/handle/123456789/46547 pt_BR Acesso Aberto application/pdf Universidade Federal do Rio Grande do Norte Brasil UFRN PROGRAMA DE PÓS-GRADUAÇÃO EM ECOLOGIA

Morfologia e função ecológica de lenticelas em espécies arbóreas da Caatinga

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