Seed desiccation tolerance/sensitivity of tree species from Brazilian biodiversity hotspots: considerations for conservation

Mayrinck, Rafaella Carvalho; Vilela, Larissa C.; Pereira, Thalita Maciel; Rodrigues-Junior, Ailton G.; Davide, Antônio Cláudio; Vaz, Tatiana Arantes Afonso

doi:10.1007/s00468-019-01815-8

Cited by 18 publications

(12 citation statements)

References 33 publications

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“…The results also showed a large number of individuals with orthodox seeds. This result is consistent with the fact that in these forests seeds can tolerate low moisture levels, remaining viable until the beginning of the rainy season, when they germinate (Mayrinck et al 2019). This explains why the Ort attribute was dominant and therefore more important than the Rec attribute in both communities (Table 2).…”

Section: Community-weighted Meansupporting

confidence: 88%

Functional Diversity and Assembly Rules of Two Deciduous Seasonal Forests in Southeastern Brazil

et al. 2021

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Deciduous seasonal forests (DSFs) have a peculiar floristic composition, with species capable of surviving periods of high water deficit in a year. Our goal was to demonstrate that abiotic filters lead to the assembly of two DSF communities that have high floristic dissimilarity. For this, we characterized the environment of the areas and used the community-weighted mean (CWM), functional richness (FRic) and functional dispersion (FDis) indices for regional recognition of functional patterns. The local assessment of assembly rules was carried out using null models. We found differences in the FRic and FDis between the areas, which was attributed to the different floristic influences exercised on the communities. However, in both, the typical attributes of dry formations were dominant (CWM), indicating that, on the regional scale of study, the dry season acts as a filter in the composition of species in the communities. On a local scale, stochastic dispersion was identified as the most influential mechanism in the assembly of communities. We conclude that deterministic and stochastic processes act in the assembly of the studied communities, and the proportion of each of these depends on the scale, with abiotic filtration predominating on a regional scale and stochastic dispersion events on a local scale.

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Section: Community-weighted Meansupporting

confidence: 88%

Functional Diversity and Assembly Rules of Two Deciduous Seasonal Forests in Southeastern Brazil

et al. 2021

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“…Intermediate seeds acquire desiccation tolerance at the end of their development, after vacuolar volume reduction and decrease in metabolism (Oliver et al, 2020). Seeds considered intermediate have characteristics similar to orthodox seeds, and sometimes characteristics similar to recalcitrant seeds, being able to tolerate desiccation between 10 and 12% humidity (Mayrinck et al, 2019) and be damaged by low temperatures (Hui et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Classification and quality of Acca sellowiana (O. Berg) Burret seeds as to tolerance to desiccation

Voss¹,

Filippi²,

Sohne³

et al. 2020

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The objective of this paper was to determine the physiological behavior and seed quality of five genotypes of Acca sellowiana regarding desiccation. Seeds were obtained from five plants of urban backyards in the cities of Dois Vizinhos - PR (A1, A2) and Vacaria - RS (A3, A4, A5). The experiment was conducted in a bifactor arrangement (5x3), with five genotypes and three levels of water content (28%, 15% and 5%), arranged into complete randomized block design, with four replicates of 50 seeds each. Seeds were germinated on absorbent paper soaked with water, being kept in BOD chamber under temperature of 25±3°C with photoperiod of 16 hours. Germination percentage, speed index and average time were assessed by counting seeds every two days for 50 days, starting from the moment of radicle emergence. No significant differences were observed for germination percentage and all genotypes surpassing 79% of germination. Desiccation of seeds had low influence on germination speed index and average time of germination, although genotype influence was verified due to genetic variability. Genotype A5 has seeds with superior quality from the others. Acca sellowiana seeds have orthodox behavior.

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“…Aquelas sementes denominadas como ortodoxas são tolerantes à dessecação e ao armazenamento. Já aquelas sementes denominadas como recalcitrantes são sensíveis à dessecação ao armazenamento (Roberts 1973, Walters 2000, Berjak & Pammenter 2007, Silva et al 2018, Mayrinck et al 2019, Stavrinides et al 2019.…”

Section: Introductionunclassified

“…Nesse caso, quanto mais distante a semente se encontra do ponto de maturidade fisiológica no momento de sua dispersão, mais sensível à dessecação será . Com isso, as sementes recalcitrantes não passando pela fase de secagem da maturação, característica das sementes tolerantes à dessecação, ou seja, as ortodoxas, não podem ser conservadas por períodos superiores a semanas ou alguns meses, uma vez que a secagem é a principal forma de se reduzir o metabolismo tanto da semente quanto de agentes causadores de danos, como micro-organismos e insetos (Silva et al 2018, Mayrinck et al 2019, Stavrinides et al 2019.…”

Section: Introductionunclassified

Taxas respiratórias de sementes de Eugenia pyriformis Cambess. dispersas em diferentes estádios de maturação

Lamarca

Parisi

Barbedo

2020

Hoehnea

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RESUMO No presente estudo, as taxas respiratórias das sementes de Eugenia pyriformis Cambess. foram analisadas de acordo com a origem do material, submetidas a diferentes níveis de secagem e temperaturas de incubação, incluindo a análise das condições ambientais durante a formação das sementes. Os resultados mostraram variações na intensidade respiratória das sementes em função da origem, principalmente entre sementes recém-dispersas (sem secagem) ou quando submetidas a secagens mais severas e temperaturas desfavoráveis à germinação. Quanto maior o teor de água das sementes na dispersão, maior a taxa de respiração. Tais variações sugerem diferenças na maturidade de sementes de diferentes regiões, com influências das condições ambientais durante a formação das sementes.

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Seed desiccation tolerance/sensitivity of tree species from Brazilian biodiversity hotspots: considerations for conservation

Cited by 18 publications

References 33 publications

Functional Diversity and Assembly Rules of Two Deciduous Seasonal Forests in Southeastern Brazil

Functional Diversity and Assembly Rules of Two Deciduous Seasonal Forests in Southeastern Brazil

Classification and quality of Acca sellowiana (O. Berg) Burret seeds as to tolerance to desiccation

Taxas respiratórias de sementes de Eugenia pyriformis Cambess. dispersas em diferentes estádios de maturação

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