Cereus jamacaru DC. and Pilosocereus pachycladus F. Ritter (Cactaceae) in the Northeast region of Brazil: future perspectives and distribution

Carvalho, Thamires Kelly Nunes; Lima, José Ribamar de Farias; Souza, Ramon Santos; Ribeiro, João Everthon da Silva; Ferreira, Ezequiel da Costa; Cruz, Denise Dias da

doi:10.26848/rbgf.v14.1.p126-134

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…pernambucoensis and T. inamoena (BARBOSA et al, 2020b;OLIVEIRA et al, 2020). Despite the current conservation status of these two species are "little worrisome", recent studies indicate a significant decrease in the distribution of these and other cactus species in their original sites of occurrence, mainly for the future scenario of climate changes (CARVALHO et al, 2021;CAVALCANTE;SAMPAIO, 2022).…”

Section: Introductionmentioning

confidence: 99%

Conservation of seeds of cactaceae species endemic to the caatinga biome: Pilosocereus pachycladus and Tacinga inamoena

2023

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Ecosystems with dry soils are particularly sensitive to climate changes and anthropogenic actions, which represents a threat to the survival of many cactus species. Ex situ seed conservation strategies should be adopted to support in situ conservation. This study evaluated the effect of conservation conditions on germination and vigor of seeds of Pilosocereus pachycladus subsp. pernambucoensis and Tacinga inamoena. The seeds were packaged in paper bags and glass containers and stored under controlled (8 ± 1 °C; 56 ± 2% relative humidity) and non-controlled (24 ± 2 °C; 75 ± 5% relative humidity) environmental conditions for 0 (control), 12, 16, and 20 months. The experiment was conducted in a completely randomized design, in a 2 × 2 × 4 factorial arrangement (conservation environment × packaging × storage period) for each species. The variables evaluated were: water content (%), germination (%), germination speed index (GSI), and mean germination time (MGT). The physiological quality of seeds of both species were preserved when seeds were maintained under controlled environment, regardless of the packaging. However, when stored under non-controlled environment, the packaging in paper bags was more efficient for the conservation of seeds of P. pachycladus subsp. pernambucoensis, and the glass container was more efficient for T. inamoena. This information may be needed for ex situ conservation of these species and to support the recovery of degraded areas susceptible to desertification in the Caatinga biome.

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Section: Introductionmentioning

confidence: 99%

Conservation of seeds of cactaceae species endemic to the caatinga biome: Pilosocereus pachycladus and Tacinga inamoena

2023

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Germination of Cactus Seeds Under Saline Stress

Silva

Azerêdo

2022

Rev. Caatinga

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Cactus seeds in seasonal dry tropical forests are subject to several stressors, such as salt stress which limits imbibition and therefore germination. Thus, this study aimed to compare germination performance of Cereus jamacaru subsp. jamacaru and Pilosocereus pachycladus subsp. pernambucoensis seeds under salinity conditions. To this end, NaCl and KCl solutions were used in the following osmotic potentials: 0.0 (control),-0.2,-0.4,-0.6,-0.8,-1.0, and-1.2 MPa. Seeds were placed to germinate at 25 °C and 12-hour photoperiod. The number of germinated seeds was counted daily for 21 days after root protrusion. The variables analyzed were: water content, germination, normal seedlings, germination speed index, and average germination time. The experimental design was completely randomized, following a 2 × 7 factorial scheme (species × osmotic potential) for each saline source. Water restriction and ionic effect caused by salts favored seed germination and vigor in both species at-0.2 and-0.4 MPa. However, from-0.8 MPa onwards, germination decreased significantly for both salts. Seeds of C. jamacaru subsp. jamacaru and P. pachycladus subsp. pernambucoensis were tolerant to salt stress since they germinated up to-0.8 MPa (NaCl) and-1.2 MPa (KCl). The latter occurred only for P. pachycladus subsp. pernambucoensis.

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Análise da estrutura e distribuição espacial de <i>Pilosocereus pachycladus</i> subsp. <i>pernambucoensis</i> em vegetação da Caatinga e de brejo de altitude

Barbosa,

Castro,

Souza

et al. 2023

Ciênc. Florest.

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Conhecer a distribuição e o padrão espacial de espécies dentro de uma comunidade vegetal é imprescindível para o planejamento de estratégias de conservação e estabelecer medidas de manejo sustentável em formações florestais, sobretudo em áreas de Caatinga. Nesse sentido, o objetivo do estudo foi analisar a estrutura e a distribuição espacial de Pilosocereus pachycladus F. Ritter subsp. pernambucoensis (F. Ritter) em populações naturais em áreas de Caatinga e de Brejo no Semiárido Paraibano, nos municípios de Bananeiras e Arara, respectivamente. Nas áreas de estudo, foram demarcadas 25 parcelas de 20 m x 20 m, totalizando uma área amostral de 10.000m2 (1 ha). Dentro das parcelas, todos os indivíduos foram etiquetados e a altura total e a circunferência foram auferidas ao nível da base do caule com auxílio de uma fita métrica. A estrutura espacial das populações foi obtida pela coleta da coordenada geográfica de cada indivíduo em cada área e expressa por meio de mapas de distribuição espacial. Foram amostrados 61 espécimes na Caatinga do município de Bananeiras, apresentando densidade absoluta de 61 ind.ha-1 e frequência absoluta (FA) de 52%. Foram amostrados 64 espécimes no bioma do município de Arara, apresentando densidade absoluta de 64 ind.ha-1 e frequência absoluta (FA) de 56%. As duas populações estavam dispostas em padrão de agrupamento (Pi = 3,74 e 3,47, respectivamente). Os indivíduos de P. pachycladus subsp. pernambucoensis das duas áreas possuem hábito de crescimento agregado e estrutura populacional com poucos indivíduos regenerantes. As ações regionais de conservação das espécies de Cactaceae em seu habitat precisam levar em consideração essas descobertas para garantir a sobrevivência dessas espécies.

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Cereus jamacaru DC. and Pilosocereus pachycladus F. Ritter (Cactaceae) in the Northeast region of Brazil: future perspectives and distribution

Cited by 4 publications

References 33 publications

Conservation of seeds of cactaceae species endemic to the caatinga biome: Pilosocereus pachycladus and Tacinga inamoena

Conservation of seeds of cactaceae species endemic to the caatinga biome: Pilosocereus pachycladus and Tacinga inamoena

Germination of Cactus Seeds Under Saline Stress

Análise da estrutura e distribuição espacial de <i>Pilosocereus pachycladus</i> subsp. <i>pernambucoensis</i> em vegetação da Caatinga e de brejo de altitude

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