CERNE <p>Cerne is a journal edited by the Federal University of Lavras, Minas Gerais state, Brazil, which quarterly publishes original articles that represent relevant contribution to Forestry Science development (Forest ecology, Forest Management, Silviculture, Technology of Forest Products).</p> <p>Submitted manuscripts must be written in English, be original, and be in accordance with the journal's standards and not be submitted for publication elsewhere. Its content (data, ideas, opinions and concepts) is the sole responsibility of the author(s). When necessary, it must be attested that the research in question was approved by the Ethics and Biosafety Committee of the institution to which the author responsible for the manuscript submission is linked to.</p> <p>By submitting the article, the authors agree that the copyright of the same is automatically transferred to the Journal Cerne. Authors can use the article after publication, without the prior permission of Cerne, as long as publication credit is given to the Journal.</p> en-US Authors who publish with this journal agree to the following terms: a) Authors retain copyright and grant the journal right of first publication (original form ); b ) Authors are permitted and encouraged to post and share their work online (e.g. in institutional repositories or on their website). (Lucas Rezende Gomide) (Danielle Aparecida Alcântara) Fri, 01 Apr 2022 15:46:08 +0000 OJS 60 DESICCATION TOLERANCE AND GERMINATION OF Psidium guajava SEEDS FROM DIFFERENT REGIONS OF BRAZIL <p><strong>Background:</strong> The germination ecology of <em>P. guajava</em> seeds collected in two regions of Brazil was investigated aiming to (1) characterize the seed batches; (2) determine the best temperature for germination; and (3) assess variations in seed desiccation tolerance (DT). For each batch, we determined seed water content and initial germination. To evaluate temperature effects, we tested seed germination. After, we generated the imbibition curves for the two provenance. To evaluate the loss of DT, the seeds were left to germinate along different time intervals. We monitored water loss by regularly weighing the seeds until achieving stabilization, keeping them under these conditions for 72 hours. After drying, the seeds were pre-hydrated and submitted to the germination test. <strong>Results:</strong> We identified variations in physiological characteristics between the seeds from north and southeast batches. At the temperature extremes, the seeds from both provenance failed to germinate. The highest germination percentages were observed at 20 and 25 °C (constant) and between 20-30 °C (alternating) for the two batches and, for the southeast batch specifically, at 30 °C. The imbibition curve displayed a triphasic pattern with a rapid increase in seed fresh weight in the first 48 hours.</p> <p><strong>Conclusion:</strong> The southeast provenance seeds lost DT abruptly, until its complete loss after radicle protrusion, which occurred in both batches. The highest values of germination speed index (GSI) of both provenance were observed after a 9-day imbibition period, suggesting seed hydration memory. Drying resulted in necrosis of the root tissue and death of the seeds with visible roots.</p> Alana Chocorosqui Fernandes, Olívia Alvina Oliveira Tonetti, Anderson Cleiton José, José Marcio Rocha Faria Copyright (c) 2022 Fri, 01 Apr 2022 00:00:00 +0000 DOES THE FAXINAL SYSTEM HELP TO MAINTAIN THE GENETIC DIVERSITY OF Curitiba prismatica (D. Landland) Salywon & Landrum? <p><strong>Background:</strong></p> <p><em>Curitiba prismatica</em>, popularly known as murta, is a forest species endemic to the Mixed Ombrophilous Forest and predominant in the Faxinal traditional agricultural system. The present study aimed to select molecular markers and assess whether the Faxinal System contributes to the maintenance of the genetic diversity of the species, thus helping to inform its management and conservation. As such, 120 adult reproductive individuals were sampled, 60 in two areas managed in the Faxinal System, and 60 in two conservation areas.</p> <p><strong>Results:</strong></p> <p>From an initial selection of 30 markers, eight ISSR markers were used which resulted in 67 polymorphic loci. The results show that the average diversity within populations is 80.54%. The Shannon (<em>I</em>) and Nei’s (<em>He</em>) diversity indices were 0.53 and 0.36, respectively. According to Nei's genetic identity, the populations form two groups, one consisting of the Faxinal populations and the other consisting of the populations in the conservation areas. This is consistent with the analysis of the genetic structure of the populations which indicated the existence of two distinct genetic groups (<em>K</em> = 2).</p> <p><strong>Conclusion:</strong></p> <p>Thus, based on molecular data, the populations in the Faxinal System had higher rates of genetic diversity, despite constant human activity within the system. Therefore, the Faxinal System contributes to the conservation of <em>C. prismatica </em>genetic diversity; however, considering the economic potential of the species and to minimize impacts on the existing fragments, there is a need to work with the local population to ensure sustainable forest management of the species.</p> Richeliel Albert Rodrigues Silva, Fábio de Almeida Vieira, Evandro Vagner Tambarussi, Kyvia Pontes Teixeira das Chagas Chagas, Luciano Farinha Watzlawick, Henrique Soares Koehler Copyright (c) 2022 Thu, 27 Jan 2022 00:00:00 +0000