No abstract

Albizia niopoides (Bentham) Burkart, known as farinha seca, is an arboreal, deciduous and pioneer plant that can be found in the semi-deciduous forest in the Paraná basin. The study on the germination and growth of the plant is fundamental for better knowledge about the establishment and regeneration of the species. Aiming to verify the germination of A. niopoides and subsequent growth, green seeds and brown seeds were germinated in a germination chamber and growth parameters were evaluated at 60, 90, and 180 days after transplanting (DAT) in a greenhouse. There was no significant difference in germination percentage between green and brown seeds. However, lower levels of mean germination times and higher levels of germination speed index were observed for brown seeds. At 180 DAT, plants showed higher shoot dry mass, root dry mass, total dry mass, number leaves and height, with no significant difference between 60 and 90 DAT for total dry mass, root dry mass and root length. The values of stem height/diameter and Dickson quality index, associated to the other growth parameters, indicate quality of the seedlings for field planting at 180 DAT.

Melastomataceae is one of the predominant families of Campos Gerais Paranaenses. However, germination and initial growth of the species in the region have been little studied. To investigate the germination, emergence, and initial growth of five Melastomataceae species in the State Park of Guartelá and in the State Park of Vila Velha, germination bioassays and emergence tests were carried out at 20 ºC, 25 ºC, and 30 ºC in a germination chamber and initial growth wasevaluated in a greenhouse. Miconia cinerascens and Miconia sellowiana had the highest percentage of germination (% G) at 25 ºC and 30 ºC. M. auricoma and M. ligustroides showed no difference in the germination percentage at the three temperatures tested, but germination delayed at 20 °C. M. radii germinated only at 25 ºC and 20 °C. Emergence was slow, both in the greenhouse and in B.O.D, with final germination of M. sellowiana completed by about 70 d in the greenhouse. The temperatures of 25 ºC and 30ºC were found an important factor in the germination of Melastomataceae species in Campos Gerais, with M. Auricoma having initial growth slow.

No abstract

Our study sought to evaluate parameters of mycorrhizal growth and colonization of Gallesia integrifolia under different light and water availability conditions. The experiment was conducted in a greenhouse, with the following treatments: three light levels (0%, 50% and 80% shading), and two water regimes (watering daily and twice a week), in a completely randomized experimental design. The results showed that the plants kept under 50% shading and the ones kept under full light, both watered daily, had the best performance. Mycorrhizal association was observed in all treatments, which favored the establishment of seedlings even in environments with less water availability. G. integrifolia showed acclimation to higher levels of shading and lower availability of water, which may be related to the species plasticity and its wide distribution.