Floração, germinação e estaquia em espécies de Lippia L. (Verbenaceae)

Abstract

-(Flowering, germination and rooting of cuttings of Lippia L. (Verbenaceae)). Lippia species from Cadeia do Espinhaço (MG, Brazil), were collected and established at the Botanical Experimental Station, Juiz de Fora, MG. The flowering of plants was evaluated in both natural and controlled conditions. Germination test was accomplished with seeds obtained from natural conditions. The rooting of cuttings was evaluated in plants cultivated in the Botanical Experimental Station. The majority of species blossomed either in the dry or in the rainy seasons. Only one species blooms in both seasons. At controlled conditions, the flowering period increased in species that flourish in the summer. Some species presented better germination with fresh collected seeds while others when the seeds were stored, evidencing both viability loss and seed dormancy. GA 3 stimulates the germination in some species, while it inhibited or not influenced on others. Some species germinate better in the darkness, while others under white light. Some of them germinate in the light or in the darkness. Adventitious roots formation in cuttings of wild species was very low and did not vary in response to season variation and auxin concentration. On the other hand, rooting of cuttings of L. alba (Mill.) N.E. Br. varied in response both to season variation and to auxin types and concentration. This is the first report on physiological reproductive aspects of endemic Lippia species from the Cadeia do Espinhaço. The results indicate the possibility to use seeds in the propagation of wild Lippia species and, they also show that reproduction through conventional vegetative propagation techniques presents quite reduced efficiency.

Physical and physiological quality of the Lippia rotundifolia seeds according to the osmotic conditioning and electrical conductivity

“…This result was confirmed by lower mortality appointed by tetrazolium test, with 4.6 and 2% of dead seeds for 96h, followed by 5.5 and 3% in 48h and 8.25 and 5.33% in 72h, respectively, for the seeds with and without tegument. Results observed were lower than germination observed by PIMENTA et al (2007), where values were recorded with 35%. This percentage may be related to conditions in which the species is reported, the time of collection and the population source, because the authors collected the seeds in the dry season in the natural environment, while in the present study, the collection occurred in the rainy season in cultivated plants.…”

Seed functional ecology in Brazilian rock outcrop vegetation: an integrative synthesis

“…2017); thus, it is not expected in Brazilian rock outcrop vegetation. For instance, this germination behaviour has only been reported for one species in our study system ( Lippia filifolia, Pimenta et al . 2007).…”

Fenologia e propagação vegetativa de Lippia dulcis Trevir (Verbenaceae)

“…Podemos observar que no caso da L. dulcis tanto no período frio e quente, foi possível propagar essa espécie através de estacas provindas de qualquer parte dessa planta. No trabalho realizado por Pimenta et al (2007) Médias seguidas por letras minúsculas diferentes na horizontal e seguidas por letras maiúsculas diferentes na vertical, diferem entre si ao nível de 5% de probabilidade, pelo teste de Tukey. Fonte: Autores.…”