Marcos Vinicius Meiado

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Verified

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• Ph.D.
• Professor at Federal University of Sergipe

This study investigated how temperature affects the expression of seed hydration memory and the acquisition of tolerance to water deficit in Cereus jamacaru subsp. jamacaru and Xiquexique gounellei subsp. gounellei. These species, native to semiarid ecosystems, face the risk of higher temperatures due to climate change, which could exceed their opt...

In recent decades, the concept of memory has gained significant attention in plant ecophysiology research. When memory is expressed during germination, it is referred to as ‘seed hydration memory’. Although numerous metrics relate to different aspects of germination, the literature lacks a method for quantifying seed hydration memory. This study ai...

In 24 years of studies on seed-hydration memory, the benefits promoted by cycles of hydration and dehydration in germination and the initial development of plants, such as increased tolerance to environmental stress, have been unraveled. However, little is still known about how the combination of different factors influences this memory. This study...

Seed hydration memory is the result of hydration and dehydration cycles (HD cycles) that occur naturally during seeds’ imbibition in semiarid ecosystems. It is expressed through the improvement of germination and initial development, especially under water deficit. This study investigated the seed hydration memory expression in Senna spectabilis va...

Seed hydration memory is an adaptive strategy for plants in semiarid environments where water availability is irregular and unpredictable. Species native to these environments that have memory benefit from discontinuous hydration during their germination process and acquire tolerance to environmental stresses. The guiding question of this study is...

Discontinuous hydration in seeds occurs commonly in species from semi-arid regions. This process of hydration and dehydration in seeds can act as a primary stimulus and activate stress memory, improving seed germination by releasing dormancy or enhancing drought tolerance. Sometimes, stimuli occur at one stage of life, and the memory is evoked at a...

Seed lifespan is a critical component of biodiversity conservation. Therefore, understanding the environmental and physiological components of seed longevity is crucial for outlining appropriate management strategies in the context of current and future climate. Here, we studied the effects of parental plant environment on cacti seed deterioration...

A disponibilidade e acessibilidade de água potável no Brasil são muito desiguais, devido a fatores geográficos e políticas públicas. O Nordeste brasileiro, em particular, enfrenta dificuldades no acesso a esse recurso. Uma solução comum tem sido o uso de poços artesianos para abastecer comunidades rurais, onde a água é essencial para a sobrevivênci...

O objetivo do estudo foi avaliar qual técnica de restauração florestal proporciona maior advento de riqueza, densidade, diversidade e cobertura vegetal da área em restauração. Para isso, foram testados os seguintes tratamentos: T1) Condução da regeneração natural; T2) Condução da regeneração natural com plantio de mudas; T2) Transposição de solo; T...

Vivipary is a remarkable trait in the Cactaceae family. Here, we reported a case of vivipary in Cereus jamacaru and observed which season had the highest vivipary incidence by examining the types of fruits and seeds produced during two contrasting periods in a seasonally dry tropical forest in northeastern Brazil. Additionally, because seeds of thi...

Variations in plant genotypes and phenotypes are expressed in ways that lead to the development of defensive abilities against herbivory. Induced defenses are mechanisms that affect herbivore insect preferences and performance. We evaluated the performance of resistant and susceptible phenotypes of Bauhinia brevipes (Fabaceae) against attacks by th...

The mechanisms of tolerance to desiccation are one of the main factors related to the ability to survive the conditions of water deficit imposed by abiotic stress. Understanding the limits of desiccation tolerance in species and environmental factors promotes this capacity, which is of great ecological importance since it can help in the choice of...

Seeds maintained on seed banks are submitted to two conditions of light during discontinuous hydration: presence or absence. We aimed to investigate the influence of light during discontinuous hydration and its relationship with the establishment of the cacti species. We raised two hypotheses: discontinuous hydration increases the longevity of seed...

Objetivo: investigar a prevalência de transtornos mentais comuns entre agricultores expostos a agrotóxicos. Métodos: agricultores do municipio de Lagarto-SE foram avaliados através de um questionário com dados sociodemográficos, de saúde e laborais. Além deste, o Self-Reporting Questionnaire (SQR-20), foi usado para a suspeição diagnóstica de trans...

Aedes aegypti and Culex quinquefasciatus mosquitoes are vectors of different arboviruses that cause a large burden of disease in humans worldwide. A key step towards reducing the impact of arboviruses on humans can be achieved through integrated mosquito surveillance and control approaches. We carried out an integrated approach of mosquito surveill...

A alelopatia é uma interação entre plantas que pode beneficiar ou prejudicar o desenvolvimento de plantas vizinhas através dos aleloquímicos que são sintetizados em diferentes órgãos. A alelopatia pode ocorrer de forma interespecífica ou intraespecífica. Desse modo, o objetivo desse trabalho foi verificar o potencial autoalelopático da exótica inv...

In seasonally dry tropical forests, seeds are naturally submitted to hydration and dehydration cycles (HD cycles) during germination, which can promote the seed hydration memory expression. We investigated how seeds of Pilosocereus catingicola subsp. salvadorensis from the same population produced and dispersed in different seasons of the year expr...

Das Durchlaufen von Samen durch Hydratations- und Dehydratationszyklen (HD-Zyklen) kann für den Erwerb von Toleranz gegenüber abiotischen Stressbedingungen und das Überleben erforderlich sein. Da Samen von Arten aus semi-ariden Ökosystemen bei der Keimung auf natürliche Weise einer diskontinuierlichen Hydration unterliegen, war es das Ziel dieser S...

In Seasonally Dry Tropical Forests, seeds are naturally submitted to hydration and dehydration cycles (HD cycles) during germination process, which can promote the seed hydration memory expression. We investigated how seeds from the same population produced and dispersed in different seasons of the year express seed hydration memory under water def...

Desiccation tolerance mechanisms are one of the main factors related to the ability to survive water deficit conditions imposed by abiotic stress. Thus, the objective of this work was to evaluate the desiccation tolerance and the influence of water deficit on the initial development of Tabebuia aurea (Silva Manso) Benth. & Hook.f. ex S. Moore. The...

Resumo O cenário atual de crise evidencia a necessidade de iniciativas que minimizem problemas ambientais da sociedade, alinhando ações desenvolvidas pelos diferentes atores sociais. A Agenda 2030 contempla 17 Objetivos de Desenvolvimento Sustentável (ODS) que permeiam a esfera do crescimento econômico, desenvolvimento social e preservação ambienta...

The prevailing crisis scenario underscores the imperative for initiatives aimed at ameliorating environmental predicaments within society, thereby harmonizing endeavors undertaken by diverse social actors. The 2030 Agenda encompasses 17 Sustainable Development Goals (SDGs), which intricately interlace economic growth, social development, and enviro...

A botânica é uma área da biologia que possui uma grande importância científica, econômica e cultural, com influência na qualidade de vida e na sobrevivência humana, mas cujo ensino é considerado difícil. Diante disso, é necessário buscar estratégias de ensino, como a divulgação científica que pode funcionar como uma ferramenta de ensino. Para aprox...

Melocactus Link & Otto is one of the most representative and endangered genera of Cactaceae in Sergipe. This study evaluates ex situ conservation under two integrative approaches: the rescue of adult plants to set a germplasm bank and the analysis of different substrates to establish a seedling bank of rescued species. We collected thirty individua...

In situ conservation is an effective way to conserve living organisms, particularly endangered species. One way to encourage and guarantee in situ conservation is the creation of Conservation Units. Thus, this study points out which endangered cacti are protected in these Conservation Units and which are living in unprotected areas. Furthermore, we...

Mesosphaerum suaveolens (L.) Kuntze is a species widely used traditionally in the treatment of ailments, such as stomach pain, hemorrhoids, cough, verminosis, ulcer, liver disease, fever, influenza, nasal congestion, and inflammation. is review aims to provide a survey of available information on seven international electronic databases (Google Sch...

Mesosphaerum suaveolens is a herbaceous plant native to the Caatinga, and has the ability to change the plant composition of surrounding areas, possibly through to the action of allelochemicals. In this study, the effect of M. suaveolens leaf decomposition on the germination and initial growth of two columnar cacti endemic to Brazil, Cereus jamacar...

O objetivo deste trabalho foi realizar um levantamento acerca dos recursos didáticos produzidos no Brasil, para auxiliar no processo de ensino-aprendizagem de conteúdos botânicos para a educação básica. Para tal, foi realizada uma revisão integrada da literatura com metanálise através da plataforma Google Scholar, utilizando como descritores: “ensi...

The discontinuous seed hydration enables the acquisition of tolerance to environmental stresses, causing a stress imprint. It may modify metabolic patterns and lead to improved stress responses. This study aims to evaluate the effects of discontinuous hydration on germination and on seedling growth of Triplaris gardneriana Wedd. under intermittent...

As sementes estão sujeitas a múltiplos estresses, como os estresses hídrico e salino, que limitam a embebição e suas chances de germinação. Portanto, o objetivo deste estudo foi avaliar o comportamento germinativo de sementes de Melocactus zehntneri (Britton & Rose) Luetzelb. (Cactaceae) quando submetidas a estresse hídrico e salino. A partir de um...

This study evaluates the effects of hydration and dehydration cycles (HD cycles) on seed germination of four Caatinga tree species (Anadenanthera colubrina var. cebil, Enterolobium contortisiliquum, Pityrocarpa moniliformis and Pterogyne nitens) subjected to different temperatures and determine the thermal upper and lower limits of germination. For...

We evaluated the urban green area of the São Raimundo Nonato city (PI), regarding the floristic composition and the pollination service, comparing it with the natural ecosystem (caatinga). We employed indices of functional diversity of the reproductive traits by means of the usual procedures of collect and identification of species, classification...

Background and Aims: Melocactus violaceus an endemic cactus distributed in eastern Brazil, is classified as a vulnerable species in the IUCN Red List due to habitat loss. This research was conducted in two contrasting Brazilian ecosystems, caatinga (Serra de Itabaiana National Park) and restinga (Pirambu beach), with the aim of determining the dist...

Cereus jamacaru DC subsp. jamacaru, has been suffering from severe anthropic pressure, in addition, when their seeds are dispersed, some end up not germinating due to the action of allelochemicals. Therefore, the present study was to evaluate the allelopathic effect of the essential oil (EO) from four species over C. jamacaru germination, as well a...

Temperature, light, water availability and excessive salt in the soil are among the abiotic factors that most influence the germination process in semiarid ecosystems. The aim of the present study was to determine the effect of these abiotic factors on seed germination in three subspecies of cactus: Discocactus bahiensis, D. zehntneri subsp. petr-h...

Cactaceae is considered the fifth most endangered taxonomic group. In light of this, the aim of this study was to evaluate the efficiency of different low-temperature storage techniques in maintaining the viability of seeds of cacti in different threat categories. Seeds of six cacti taxa were stored in a cold chamber (8 C), a freezer (−5 C), in liq...

Discontinuity during the process of imbibition in seed germination in arid and semi-arid ecosystems produces cycles of hydration and dehydration (HD cycles). The aim of this study was to evaluate the effect of HD cycles on germination and initial growth of Mimosa tenuiflora seedlings, testing the hypothesis that seeds that pass through HD cycles pr...

Seed hydration memory is the ability of seeds to retain biochemical and physiological changes caused by discontinuous hydration. This study aimed to determine if Senna spectabilis (DC.) H.S. Irwin & Barneby var. excelsa (Schrad.) H.S.Irwin & Barneby (Fabaceae) present seed memory and evaluate the effects of hydration and dehydration cycles (HD) on...

Does Cenostigma pyramidale (Fabaceae) have an allelopathic effect on seed germination of Pilosocereus gounellei subsp. gounellei (Cactaceae)? ABSTRACT- Allelopathy is the process of interaction between two plants through the release of allelochemicals from one to another, with direct or indirect effects, affecting positively or negatively the devel...

This study evaluates the fruiting phenology, fruit traits, and seed dispersal in two Pilosocereus (Cactaceae) species that are widely distributed in Caatinga vegetation. We monitored the fruiting phenology of Pilosocereus gounellei and Pilosocereus chrysostele on a monthly basis for a period of 4 years (45 months from March 2009 to November 2012),...

Embora sejam publicados artigos sobre sementes de cactos dos diversos ecossistemas brasileiros há mais de 50 anos, as pesquisas que envolvem o conhecimento acerca da morfologia e fisiologia das sementes e plântulas de Cactaceae são consideradas extremamente recentes no país, pois, durante as quatro primeiras décadas, muito pouco foi publicado sobre...

A dormência é uma característica adaptativa que proporciona a permanência das sementes e a sobrevivência de espécies nos diferentes ecossistemas, mesmo em períodos desfavoráveis para a germinação e o estabelecimento de novos indivíduos. Este estudo teve como objetivo avaliar a eficiência da escarificação de sementes de Lonchocarpus sericeus (Poir.)...

O objetivo deste estudo foi avaliar a morfometria dos frutos e as respostas germinativas de Godmania dardanoi (J.C. Gomes) A.H. Gentry (Bignoniaceae) a fatores abióticos, assim como contribuir para o conhecimento da ecofisiologia dessa espécie e subsidiar estratégias para a sua conservação. Os frutos e sementes foram coletados no município de Umbur...

O objetivo deste estudo foi avaliar se o aumento da temperatura reduz a tolerância ao estresse hídrico na germinação de sementes de Pereskia grandifolia Haw. subsp. grandifolia (Cactaceae). O déficit hídrico foi simulado com soluções de polietilenoglicol 6000 nos potenciais osmóticos de 0,0; -0,1; -0,3; -0,6 e -0,9 MPa e as temperaturas constantes...

A hidratação descontínua proporciona maior germinabilidade em menor tempo, com maior velocidade e sincronização, além de favorecer a produção de mudas mais resistentes que podem ser utilizadas em projetos de recuperação de áreas degradadas. O objetivo deste trabalho estudo foi avaliar o efeito dos ciclos de hidratação e desidratação (HD) na germina...

O objetivo deste estudo foi avaliar a morfometria do fruto e as respostas germinativas de sementes de Handroanthus spongiosus (Rizzini) S. Grose (Bignoniaceae) submetidas a fatores ambientais, assim como contribuir para o conhecimento da ecofisiologia dessa espécie ameaçada de extinção. As sementes foram coletadas no município de Casa Nova, localiz...

Os cotilédones são estruturas morfológicas que armazenam nutrientes e tem a função de transferi-los para a plântula em desenvolvimento até o seu estabelecimento e o início da fotossíntese. Estudos sobre a predação de sementes na Caatinga ainda são raros, principalmente com espécies ameaçadas de extinção como Handroanthus spongiosus (Rizzini) S. Gro...

The water uptake by the seed in arid and semi-arid ecosystems may not be continuous, but may occur in hydration and dehydration cycles (HD). In order to investigate the benefits of discontinuous hydration on seed germination of Pilosocereus catingicola subsp. salvadorensis subjected to environmental stresses, an imbibition curve was determined and...

Resumen La familia Cactaceae se encuentra en todo el territorio brasileño, pero es un ícono de la región semiárida, con una alta diversidad de especies. Este capítulo hace una revisión general de publicaciones sobre los cactos de Brasil, principalmente de la zona semiárida, su conocimien-to, uso y estado de conservación; de las principales especies...

The seed disperser's effectiveness relates to the qualitative and quantitative components of seed dispersal processes in terms of frequency, dispersal distance and seed germination. This study recorded Tropidurus semitaeniatus lizards acting as primary seed dispersers of Pilosocereus gounellei, a columnar cactus for which fruit morphology suggests...

In Northeast Brazil, the use of melon cactus (Melocactus spp.) is quite common and varied. Thus, the present study aimed to perform various analyzes in cladodes of melon cactus [Melocactus zehntneri (Britton & Rose) Luetzelburg], to understand the reasons for the use of this species. The cladodes were collected in the city of Campina Grande and tak...

With restricted populations and a small number of individuals, Discocactus bahiensis Britton & Rose (Cactaceae) is an endangered species in Brazil and its capacity for the formation of seed banks in the soil and the maintenance of seed viability remains unknown. Thus, the aim of the present study was to determine the most efficient way to maintain...

We describe, for the first time, the attraction of an unidentified millipede species (Urostreptus sp.) to an elaiosomes of a Euphorbiaceae species (Jatropha mutabilis (Pohl) Baill.). After field observations of Urostreptus specimens feeding on elaiosomes' seeds of J. mutabilis in areas of Caatinga in Petrolina, northeast Brazil, we conducted experi...

Myracrodruon urundeuva Allemão (Anacardiaceae) é popularmente conhecida como aroeira-do-sertão. É uma espécie nativa e de ampla distribuição pelo país. Objetivou-se selecionar o tratamento de hidratação descontínua das sementes que proporcionasse um melhor desenvolvimento das mudas de aroeira-do-sertão. Antes de serem semeadas, as sementes passaram...

Pilosocereus catingicola (Gürke) Byles & Rowley subsp. salvadorensis (Werderm.) Zappi é um cacto colunar conhecido popularmente como facheiro e ocorre em três ecossistemas do Estado de Sergipe: Caatinga, Mata Atlântica e Restinga. Plantas que ocorrem em diferentes ecossistemas podem apresentar variações morfoanatômicas interpopulacionais relacionad...

Recently, a new cactus was discovered in an area of the Caatinga, a tropical dry forest of north-eastern Brazil. Although this discovery is excellent news, Melocactus sergipensis is critically endangered because it is affected by deforestation of native vegetation and chemicals used in the maize crop, next to the holotype locality. The aim of this...

Um dos principais centros de diversidade de cactos se localiza na região Nordeste do Brasil e inclui um número significativo de espécies endêmicas. Muitas dessas espécies endêmicas encontram-se ameaçadas de extinção devido às ações antrópicas associadas às baixas taxas de desenvolvimento dos cactos e a extração dessas plantas para o comércio ilegal...

The seed technologies related with germination and seed research has provided unprecedented opportunities for the biologic research community. Researchers require such information to rapidly determine the speed of seedling emergence. However, an immense amount of data must be analyzed to achieve this goal. In this paper, we introduce a computer sof...

Evaluation of the seed germination is an important aspect to the determination of seed longevity and, consequently, plant conservation. The aim of the present study was to analyze the effect of storage time on seed germination for eight species of Cactaceae. Seeds placed in cold storage (7 ± 2°C) in periods ranging from 24 to 30 months. The effect...

In order to understand the local distribution of mandacaru (C. jamacaru subsp. jamacaru) and facheiro (P. pachycladus subsp. pernambucoensis), as well as its relation to a rural community, this work was carried out in the peripheral vegetation of the rural community of Santa Rita, Municipality of Congo, Paraíba, Brazil. Using the guided tour, every...

Environmental factors are used by plants as spatio-temporal indicators of favorable conditions for seed germination. Thus, the objective of this study was to determine the effect of light and temperature on seed germination of 30 taxa of Cactaceae occurring in northeastern Brazil and to evaluate whether fluctuations in temperature are capable of al...

Animais frugívoros desempenham um papel importante na manutenção dos ecossistemas, promovendo uma maior ocorrência de plantas tanto pela superação da dormência de sementes e subsequente desenvolvimento de plântulas como pela aceleração e aumento da germinação. Assim, o objetivo deste estudo foi avaliar a germinação de sementes de quipá [Tacinga ina...

The purpose of this study is to assess the ecological attributes, geographic distribution, conservation status and endemism of cactus species in the São Francisco River Watershed (SFRW). In order to gather information on the cactus species found in the SFRW, three sources of information were used: collections from Brazilian herbaria, bibliographic...

Buscando entender a distribuição local do mandacaru (C. jamacaru subsp. jamacaru) e do facheiro (P. pachycladus subsp. pernambucoensis), além da sua relação com uma comunidade rural, este trabalho foi realizado na vegetação periférica da comunidade rural de Santa Rita, Município do Congo, Paraíba, Brasil. Utilizando a turnê guiada, cada indivíduo e...

A large part of flowering plants have sexual and asexual propagation. The occurrence of these reproductive modes is probably related to adaptive responses to environmental conditions, species distribution, genetic variation and the maintenance of multiple biological interactions. Here we examined populations of eight cacti species from Brazilian Ca...

Summary: The dwarf Melocactus sergipensis, sp. nov., is described from a single lowland locality in the NE Brazilian state of Sergipe. It is compared with members of the M. VIOLACEUS species group, from which it may have been isolated on calcareous rocks within a former dense, high caatinga forest. Its longer term survival in the wild is in serious...

RESUMO-O objetivo desta revisão foi reunir informações disponíveis na literatura sobre estudos de banco de sementes do solo realizados na Caatinga, uma Floresta Tropical Seca do Nordeste do Brasil. Embora existam poucos estudos realizados neste ecossistema sobre o tema proposto (15 publicações), sabe-se que a maioria das Fabaceae produz sementes or...

Sementes de Commiphora lepthophloeos (Mart.) J.B.Gillet (Burseraceae) apresentam baixa porcentagem de germinação em condições de laboratório, porém, observa-se um elevado número de plântulas em áreas de ocorrência natural desta espécie. Assim, o objetivo do presente estudo foi entender o comportamento fisiológico das sementes de C. lepthophloeos qu...

Life history traits are considered key indicators of plant invasibility. Among them, the germination behavior of seeds is of major relevance because it is influenced by environmental factors of invaded ecosystem. Here, we investigated how seed traits and seed tolerance to environmental factors on seed germination of Calotropis procera vary dependin...

Cactos sao capazes de se reproduzir assexuadamente mesmo em condicoes desfavoraveis. Assim, o objetivo deste estudo foi determinar se a producao clonal ocorre com frequencia em populacoes de um cacto localizadas na Caatinga, bem como avaliar a distribuicao espacial de plântulas originadas a partir de sementes germinadas e plântulas-clone. Foram sel...

Entomofauna associated to fruits and seeds of two species of Enterolobium Mart. (Leguminosae): Harm or benefit? The aims of the present study were to identify the entomofauna associated to the fruits and seeds of Enterolobium contortisiliquum (Vell.) Morong and Enterolobium timbouva Mart. (Leguminosae), as well as to determine relationships among i...

The aim of this study was to gather all information about seed germination of Brazilian cacti available in the literature and finding patterns of germination behavior among species already evaluated in previous studies. I consulted all papers published in the last five decades which evaluated light and temperature effects on seed germination of cac...