Anais da Academia Brasileira de Ciencias最新文献

Low-carbohydrate diets improved glucose homeostasis and physical performance by regulating mitochondrial function via the SIRT3/PGC1α pathway. 低碳水化合物饮食通过SIRT3/PGC1α途径调节线粒体功能，改善葡萄糖稳态和身体机能。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-12 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620251367

Tingting Li, Xiaowen Wang, Hao Lu, Minghua Chen, Hui Zhang, Mingchen Zhang, Zhongguang Sun

{"title":"Low-carbohydrate diets improved glucose homeostasis and physical performance by regulating mitochondrial function via the SIRT3/PGC1α pathway.","authors":"Tingting Li, Xiaowen Wang, Hao Lu, Minghua Chen, Hui Zhang, Mingchen Zhang, Zhongguang Sun","doi":"10.1590/0001-3765202620251367","DOIUrl":"https://doi.org/10.1590/0001-3765202620251367","url":null,"abstract":"This study aimed to analyze the effects of two low-carbohydrate diets (LCDs) on glucose homeostasis and physical performance in sedentary mice. Eighteen C57BL/6J mice were randomly divided into three groups: fed with standard chow (CON), high-fat LCD chow (HF-LCD), and high-protein LCD chow (HP-LCD). After two weeks, body weight (BW), food intake, fasting serum ketone bodies (β-OHB), blood glucose, glucose tolerance, and relative mass of skeletal muscle were measured. The physical performance was assessed using a treadmill endurance test, and the mRNA levels of mitochondrial function (SIRT3 and PGC1α) in the quadriceps were measured by qRT-PCR. Compared with the CON group, the HF-LCD group showed significantly increased fat content, β-OHB, and physical performance; the HP-LCD group showed significantly decreased calorie intake and BW. Compared with the HF-LCD group, the HP-LCD group showed significantly lower calorie intake, BW, fat content, β-OHB, skeletal muscle mass, and physical performance. Mechanistically, the mRNA levels of SIRT3-PGC1α in the HF-LCD group were higher than those in the other group. Both short-term LCDs can maintain glucose homeostasis in mice. However, only HF-LCD can increase β-OHB and physical performance without compromising skeletal muscle mass and strength. The underlying mechanism may involve transcriptional regulation of mitochondrial‑related genes via the SIRT3/PGC1α pathway.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20251367"},"PeriodicalIF":1.2,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of bacteria present in the harvest and postharvest stages in medical cannabis (Cannabis sativa L.) grown in Colombia. 鉴定在哥伦比亚种植的医用大麻（大麻sativa L.）的收获和收获后阶段存在的细菌。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-12 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250650

Mónica Julieth Henao-López, Laura Sofia Ocampo-Nieto, Jolián Andrés Vargas-Alzate, Katherin Castro-Ríos, Claudia N Montoya-Estrada

{"title":"Identification of bacteria present in the harvest and postharvest stages in medical cannabis (Cannabis sativa L.) grown in Colombia.","authors":"Mónica Julieth Henao-López, Laura Sofia Ocampo-Nieto, Jolián Andrés Vargas-Alzate, Katherin Castro-Ríos, Claudia N Montoya-Estrada","doi":"10.1590/0001-3765202620250650","DOIUrl":"https://doi.org/10.1590/0001-3765202620250650","url":null,"abstract":"Cannabis has various secondary metabolites, such as cannabinoids (THC and CBD), which are of great interest due to their interactions with the human body's cannabinoid system, offering therapeutic effects, which has led to an increase in crop production. This research aimed to characterize the bacteria present in medicinal cannabis inflorescences during the harvest and post-harvest stages. Cannabis inflorescences of two commercial genotypes (Gen A and Gen B) were incubated on Luria Bertani agar to evaluate the presence of bacteria, and macroscopic and microscopic characteristics of the resulting colonies were determined from axenic cultures. Molecular identification was performed using the 16S ribosomal region. During the harvest stage, four isolates were obtained, all of which were Gram-negative. One was from Gen A and three from Gen B. At the post-harvest stage, seven isolates were identified as Gram-negative: five originated from Gen A, and two were from Gen B. In total, 11 isolates were obtained, eight of which were identified as Pseudomonas sp. The remaining six isolates were identified as follows: one from the Enterobacteriaceae family, one from Stenotrophomonas panacihumi, and one from the Agrobacterium tumefaciens complex. These results provide insights into the bacterial composition of cannabis samples harvested from Colombia.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20250650"},"PeriodicalIF":1.2,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First pathogenicity study of Hippeastrum sp. cultivars for the root-knot nematode Meloidogyne enterolobii. 马鞭草品种对肠根结线虫致病性的首次研究。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-12 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620251132

Rhayane R Pillat, Claudio Marcelo G Oliveira

{"title":"First pathogenicity study of Hippeastrum sp. cultivars for the root-knot nematode Meloidogyne enterolobii.","authors":"Rhayane R Pillat, Claudio Marcelo G Oliveira","doi":"10.1590/0001-3765202620251132","DOIUrl":"https://doi.org/10.1590/0001-3765202620251132","url":null,"abstract":"Amaryllis (Hippeastrum sp.) is an important ornamental plant, yet information on its interaction with phytonematodes, especially with the aggressive and emerging root-knot nematode Meloidogyne enterolobii, remains scarce. This study evaluated, under controlled greenhouse conditions, the reaction of two amaryllis cultivars to M. enterolobii. Two experiments were conducted using Hippeastrum cv. Red Bull (experiment 1) and Hippeastrum cv. Orange Sovereign (experiment 2). Bulbs were inoculated with 0 (control), 10,000, 20,000 and 40,000 eggs and juveniles of M. enterolobii. Plant growth parameters, including fresh belowground biomass (FBB), fresh shoot biomass (FSB) and the reproduction factor of M. enterolobii (RF) were evaluated. Nematodes failed to establish on either Hippeastrum cultivars (RF < 1), indicating that both cultivars behave as inadequate hosts, yet nematode parasitism reduced plant growth parameters. The Red Bull cultivar presented a 30% reduction in FBB when inoculated with a population dose of 40,000 nematodes, exhibiting symptoms of intolerance to high inoculum densities in M. enterolobii infections. The Orange Sovereign cultivar, even though it showed a tendency towards a reduction in FBB and FSB, this reduction was not significant, and the plants were classified as resistant. This is the first study reporting the parasitic behavior of M. enterolobii in Hippeastrum cultivars.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20251132"},"PeriodicalIF":1.2,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of gamma radiation effects on the metabolic activity of Escherichia coli ATCC 25922 cells. γ辐射对大肠杆菌ATCC 25922细胞代谢活性影响的研究。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-12 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620251237

Thaís S Costa, Daphne C R Mello, Claudio A Federico, Luciane D DE Oliveira, Priscila C Fernandes

{"title":"Study of gamma radiation effects on the metabolic activity of Escherichia coli ATCC 25922 cells.","authors":"Thaís S Costa, Daphne C R Mello, Claudio A Federico, Luciane D DE Oliveira, Priscila C Fernandes","doi":"10.1590/0001-3765202620251237","DOIUrl":"https://doi.org/10.1590/0001-3765202620251237","url":null,"abstract":"Investigating how Escherichia coli responds to gamma radiation enhances understanding of microbial functional mechanisms by elucidating how bacterial cells cope with ionizing radiation-induced DNA damage and oxidative stress. E. coli is a Gram-negative bacterium found in the intestinal microbiota of humans and widely used as a model organism in radiation microbiology. Exposure to ionizing radiation can impair cellular integrity, potentially leading to metabolic shifts and a loss of metabolic capacity. In this study, the effects of gamma radiation on E. coli populations were evaluated using MTT reduction assays as an operational proxy for metabolic activity rather than strict replicative viability. Irradiation experiments were performed using a fixed dose rate of 6 Gy/h with variable absorbed doses (0.05 to 40 Gy), as well as variable dose rates at a fixed dose of 6 Gy. Bacterial cells were suspended in BHI broth and incubated to allow biofilm formation. The results showed distinct metabolic profiles in planktonic and biofilm-associated cells at a constant dose rate, with dose-dependent alterations in metabolic output during biofilm formation.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20251237"},"PeriodicalIF":1.2,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New data on Paecilaemella (Opiliones, Cosmetidae): two new Ecuadorian species from opposite Andean slopes. 拟青霉属新资料（拟青霉属，Cosmetidae）：来自安第斯山脉相对斜坡的厄瓜多尔两新种。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-12 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620251302

Laura R Caramori, Adriano B Kury, Miguel Medrano

引用次数: 0

Antibacterial and Biological Performance of Nanostructured Bioactive Glasses with Silver and Titanium Dioxide. 纳米结构生物活性玻璃的抗菌及生物性能研究。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-12 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250339

Júlio César Tsukide, Hugo F Perini, Malu Mateus S Obata, Carlo José F Oliveira, Virmondes Rodrigues Junior, Noelio O Dantas, Anielle Christine A Silva, Marcos Vinicius DA Silva, Rodrigo César Rosa

{"title":"Antibacterial and Biological Performance of Nanostructured Bioactive Glasses with Silver and Titanium Dioxide.","authors":"Júlio César Tsukide, Hugo F Perini, Malu Mateus S Obata, Carlo José F Oliveira, Virmondes Rodrigues Junior, Noelio O Dantas, Anielle Christine A Silva, Marcos Vinicius DA Silva, Rodrigo César Rosa","doi":"10.1590/0001-3765202620250339","DOIUrl":"https://doi.org/10.1590/0001-3765202620250339","url":null,"abstract":"Nanostructured bioactive glasses have attracted increasing attention as multifunctional biomaterials for infection-prone biomedical applications. In this study, pure and doped bioactive glasses incorporating silver (Ag₂O-derived species) and titanium dioxide (TiO₂) were evaluated for their antibacterial performance and in vitro cytocompatibility. Antibacterial activity was assessed against Escherichia coli, Staphylococcus aureus, and methicillin-resistant S. aureus (MRSA). While the undoped bioactive glass showed no antibacterial effect, Ag- and TiO₂-doped formulations significantly reduced bacterial growth in a concentration-dependent manner. Ag-doped glasses exhibited the highest antibacterial efficacy, achieving complete inhibition of E. coli and MRSA at higher concentrations, whereas TiO₂-doped samples showed moderate inhibitory effects. Cytocompatibility was evaluated using an indirect assay with VERO CCL-81 cells, and all formulations maintained cell viability above 80%, including Ag-containing glasses at the highest tested concentrations. These results indicate that the incorporation of Ag and TiO₂ enhances antibacterial performance while preserving acceptable cytocompatibility under the tested conditions. Overall, these findings support the potential application of doped bioactive glasses in infection-prone bone repair scenarios; however, further studies on ion release, long-term stability, and in vivo biocompatibility are required.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20250339"},"PeriodicalIF":1.2,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fungal community in the soil of Punta Hannequim, Antarctica, assessed by environmental DNA metabarcoding. 南极Punta Hannequim土壤中真菌群落的环境DNA元条形码评估。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-09 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250057

Michel Rodrigo Z Passarini, Gabriela R S Benegas, Grécia Antonella Nina Flores, Gileno V Lacerda Júnior, Júlia R Ottoni, Paulo Eduardo A S Câmara, Luiz Henrique Rosa

{"title":"Fungal community in the soil of Punta Hannequim, Antarctica, assessed by environmental DNA metabarcoding.","authors":"Michel Rodrigo Z Passarini, Gabriela R S Benegas, Grécia Antonella Nina Flores, Gileno V Lacerda Júnior, Júlia R Ottoni, Paulo Eduardo A S Câmara, Luiz Henrique Rosa","doi":"10.1590/0001-3765202620250057","DOIUrl":"https://doi.org/10.1590/0001-3765202620250057","url":null,"abstract":"The fungal community present in soil collected from Punta Hannequim on King George Island, Antarctica, was evaluated using DNA metabarcoding through high-throughput sequencing. A total of 123 fungal amplicon sequence variants (ASVs) were detected, belonging to the phyla Ascomycota, Basidiomycota, Chytridiomycota, Mortierellomycota, and Rozellomycota. The most dominant ASVs were from the genera Trichoderma, Gorgomyces, and Neobulgaria. In addition, many unassigned ASVs were identified and may represent previously unknown fungal diversity in Antarctic microbial ecology. The observed ASV richness rarefaction curve showed that all diversity of the sample was recovered. The taxonomic groups observed in the sampled region included endemic, cosmopolitan, and opportunistic plant pathogenic taxa. The results presented expand knowledge of the fungal community in the soil of King George Island, aiming to guide the development of selective culture media capable of recovering greater microbial diversity from this environment and consequently, broadening perspectives in the field of Antarctic mycology.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20250057"},"PeriodicalIF":1.2,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exercise training and enalapril mitigate steatotic liver disease and islet disarrangement but diverge in inflammatory modulation in obese mice. 运动训练和依那普利减轻肥胖小鼠脂肪变性肝病和胰岛紊乱，但在炎症调节方面存在分歧。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-09 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250448

Vinícius Sepulveda-Fragoso, Ana Beatriz Proença, Jefferson F Evangelista, Beatriz G DE Luca, Ana Livia Ladislau S Vieira, Kauet M Gama E Souza, Beatriz Alexandre-Santos, Clarice Machado-Santos, Cristiane Matsuura, Antonio Claudio Lucas DA Nóbrega, D'Angelo Carlo Magliano, Eliete Dalla Corte Frantz

{"title":"Exercise training and enalapril mitigate steatotic liver disease and islet disarrangement but diverge in inflammatory modulation in obese mice.","authors":"Vinícius Sepulveda-Fragoso, Ana Beatriz Proença, Jefferson F Evangelista, Beatriz G DE Luca, Ana Livia Ladislau S Vieira, Kauet M Gama E Souza, Beatriz Alexandre-Santos, Clarice Machado-Santos, Cristiane Matsuura, Antonio Claudio Lucas DA Nóbrega, D'Angelo Carlo Magliano, Eliete Dalla Corte Frantz","doi":"10.1590/0001-3765202620250448","DOIUrl":"https://doi.org/10.1590/0001-3765202620250448","url":null,"abstract":"Metabolic-associated steatotic liver disease (MASLD) is increasingly prevalent worldwide. We previously demonstrated that enalapril and aerobic exercise training (AET) improve steatosis in an obesity model. Here, we investigated the effects of both interventions on pancreatic morphology, oxidative stress, and inflammatory cytokines in the steatotic liver. Male C57BL/6 mice were fed either a standard chow (SC) or a high-fat diet (HF) for 8 weeks. The HF group was divided into enalapril treatment (HF-E, 10 mg/kg/day), AET (HF-T, 300 min/week treadmill running), and both interventions (HF-ET) for 8 additional weeks alongside the HF diet. We measured body mass (BM) gain, plasma cytokines, and pancreatic islet structure. Liver mass, oxidative stress, renin-angiotensin system (RAS), and cytokines were also evaluated. The HF group showed greater BM gain, higher pro-inflammatory cytokines, and hypertrophied pancreatic islets than the SC group. All interventions reduced these parameters, though the HF-E group maintained an enlarged pancreatic islet. In the liver, all interventions improved oxidative stress and reduced RAS overactivation. However, enalapril-treated groups retained elevated IL-6, NFκB, TGF-β, and CD11c protein levels, whereas trained groups exhibited levels comparable to SC. In conclusion, both interventions improved islet structure, oxidative stress, and RAS overactivation, but enalapril failed to reverse the pro-inflammatory cytokine profile in obese mice.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20250448"},"PeriodicalIF":1.2,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-restricted feeding with resistance training is not superior to conventional feeding for body composition and muscle strength: a systematic review and meta-analysis. 时间限制喂养与阻力训练并不优于传统喂养的身体成分和肌肉力量：一个系统的回顾和荟萃分析。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-09 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620240672

Anderson M O H Verdi, Jaqueline M Soares, Michel J Andrade, Caryna E Mazur, Daniela C Gonçalves

{"title":"Time-restricted feeding with resistance training is not superior to conventional feeding for body composition and muscle strength: a systematic review and meta-analysis.","authors":"Anderson M O H Verdi, Jaqueline M Soares, Michel J Andrade, Caryna E Mazur, Daniela C Gonçalves","doi":"10.1590/0001-3765202620240672","DOIUrl":"10.1590/0001-3765202620240672","url":null,"abstract":"Intermittent fasting is becoming popular for its quick benefits on body composition. With rising interest in weight loss, understanding its impact on fat-free mass is essential. It investigates the effects of time-restricted feeding compared to conventional diets on body composition in healthy adults undergoing resistance training. The registration is in PROSPERO (CRD42023423274), and ethical approval was not required. No financial support was received. Databases consulted included MEDLINE, CENTRAL, Embase, and Scopus, with the final search conducted on November 13, 2023. Only randomized controlled trials with healthy human participants aged 18 or older, who underwent TRF and strength training, were included. The risk of bias was assessed using the RoB2 tool. The review comprises 5 studies, with a final sample of 120 individuals. Among them, only 2 studies showed a statistically significant difference in the impact of fasting on body weight and fat mass. Regarding fat-free mass, it remained consistent across groups at the intervention's end. The meta-analysis suggested an estimate of -0.48kg (95% CI: -2.52 to 1.56), indicating that the average result did not significantly differ from zero. Contrary to the initial hypothesis, the findings do not provide statistically significant evidence that TRF increases fat-free mass.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 3","pages":"e20240672"},"PeriodicalIF":1.2,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The minimalist life of males in mosses: understanding the reproductive biology of two Schlotheimia species. 苔藓中雄性的极简生活：了解两个Schlotheimia物种的生殖生物学。

IF 1.2 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-10-09 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620240560

Cíntia Aparecida T Araújo, Mateus Fernandes Oliveira, Adaíses Simone Maciel-Silva

{"title":"The minimalist life of males in mosses: understanding the reproductive biology of two Schlotheimia species.","authors":"Cíntia Aparecida T Araújo, Mateus Fernandes Oliveira, Adaíses Simone Maciel-Silva","doi":"10.1590/0001-3765202620240560","DOIUrl":"https://doi.org/10.1590/0001-3765202620240560","url":null,"abstract":"Sexual size dimorphism (SSD) is known mainly among animals, while among plants, this feature is found only in mosses. Dwarf males are supposedly advantageous for dioicous mosses because they almost exclusively produce antherozoids and grow on females, decreasing fertilization distances. We evaluated the relationship between dwarf males and spore size classes, number of spores per sporangium and their germination rates of two species of the genus Schlotheimia - S. tecta and S. rugifolia. We also investigated the association between dwarf males and female sexual success (i.e., sporophyte production). The results indicate extreme SSD for S. tecta and S. rugifolia, although regular-sized males of S. tecta were occasionally found in the study area. Schlotheimia rugifolia produced more spores (1.5x), while neither species exhibited anisospory (two size classes of spores). Sexual success was not directly associated with dwarf males on female shoots for either species, but it was affected by phorophytes (i.e., colonies in the same tree). Despite their minimalist existence, dwarf males likely play a crucial role in the reproduction of Schlotheimia, especially in the fertilization of females in S. tecta.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 4","pages":"e20240560"},"PeriodicalIF":1.2,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0