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.

We evaluated the phenodynamics of Solanum mauritianum Scop. in a forest plantation to check the ecological behavior of this species in restoration condition. Twelve trees were observed over 24 months, according to regrowth, flowering, fruiting and defoliation. The phenophases were correlated with the photoperiod, climatic variables, maximum, average, minimum temperature and precipitation through Pearson´s correlation. The species exhibited over the year highly synchronic, flowering and fruiting. The flowering occurred from January to December, with floral buds being observed simultaneously with ripe fruits, reaching a maximum dispersion in February. Temperatures below 10°C and frosts inhibited the leaf re-sprouts, promoting a leaf deciduous peak in March and June. The permanent availability of resources as flowers and fruits and the resilience of vegetative phenophases in response to severe frosts make S. mauritianum an adapted species of highly ecological potential to be used in regional restoration projects.

The number of chromosomes and the meiotic characterization are important to studies involving genetic variability, germplasm and biodiversity. However, native forest species have not been sufficiently analyzed from a cytotaxonomic point of view. Therefore, the number of chromosomes, the meiotic behavior and the pollen viability of the Diatenopteryx sorbifolia Radlk were determined from five different accessions located in the southern region of Brazil. The species was considered diploid, 2n = 30 (x = 15), with regular meiotic behavior in phase I and absent in phase II, suggesting the presence of a genetic abnormality. Pollen grains infertility was between 57 and 67%. which may be associated to the formation of a low number of seeds in Diatenopteryx sorbifolia, probably due to the irregular behavior of the microsporogenesis.

O estudo teve por objetivo caracterizar o comportamento dos ciclos vegetativos e reprodutivos de Trema micrantha (L.) Blume (grandiúva) em área de reflorestamento na região sudoeste do estado do Paraná, Brasil. Foram monitoradas, quinzenalmente, as fenofases vegetativas e reprodutivas de 12 indivíduos, sendo três por parcela de plantio. Em seguida, foram analisadas a sincronia das fenofases, a correlação com as variáveis meteorológicas e a periodicidade dos eventos. A espécie apresentou alto índice de queda foliar no período de inverno (junho-agosto), ocorrendo a retomada de brotação em setembro, sendo esta influenciada pelo aumento de temperatura e volume de precipitação pluviométrica. Para as fenofases reprodutivas, a floração tem início na primavera (setembro-outubro) e atinge seu máximo em dezembro; a maturação de frutos e dispersão de sementes inicia em novembro, concentrando-se no período de janeiro a abril. A floração e a frutificação da espécie apresentam padrão anual estendido e alta sincronia. A intensidade dos botões florais, flores e frutos imaturos se correlacionam de forma significativa com a variação de temperatura e fotoperíodo no sudoeste Paranaense, demonstrando a interação de Trema micrantha com o ambiente, bem como sua adaptação em florestas subtropicais da Mata Atlântica, estando a fenologia da espécie condicionada mais fortemente pelo fotoperíodo e pela temperatura do que pela precipitação.