Condicionamento osmótico e GA3 na germinação de sementes de araticum de terra fria (Annona emarginata (Schltdl.) H. Rainer)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Germinação de sementes e importancia relativa da qualidade, disponibilidade e morfologia de frutos na dieta de Carollis perspicillata (Chiroptera: phyllostomidae)

Pós-graduação em Ciências Biológicas (Botânica) - IBB

Micropropagation of Maclura tinctoria L.: an endangered woody species

Algumas espécies nativas produzem sementes com baixa porcentagem de germinação e, na maioria dos casos, dormência que pode dificultar o aparecimento de novos indivíduos, por meio da propagação sexuada. A Maclura tinctoria tem sido considerada como ameaçada de extinção devido ao uso indiscriminado de sua madeira e à baixa taxa de germinação de suas sementes. Nesse contexto, o objetivo deste estudo foi estabelecer uma metodologia de propagação in vitro para a espécie. Combinações de ANA + BAP, diferentes concentrações de GA₃ e combinações de AIB + carvão ativado foram avaliadas na indução de brotações, alongamento caulinar e indução de enraizamento, respectivamente. Os resultados indicaram que a máxima formação de brotações foi obtida quando 5,37 mM NAA + 4,45 mM BAP foram utilizados. O crescimento das brotações foi observado com 5,48 mM GA₃. Para a formação de raízes, foi indicado o uso do meio WPM, com pH ajustado para 7,0, suplementado com 23,62 mM AIB e 4,7 g L^-1 de carvão ativado. O uso de sombrite 70% por sete dias, seguido da utilização de sombrite 50 e 30%, também por sete dias cada, promoveu 97% de sobrevivência de plantas.

Disponibilidade hídrica na germinação de sementes e no crescimento de plântulas da leguminosa forrageira Macrotyloma axillare (E. Mey) Verdc. cv. Java

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Morfologia da testa e potencial fisiológico de sementes de soja

Pós-graduação em Agronomia - FCAV

Avaliação do potencial fisiológico de sementes de mutamba (Guazuma ulmifolia Lam.) por meio de diferentes testes de vigor

Pós-graduação em Agronomia - FCAV

Germinação de sementes de palmeiras quanto à tolerância a dessecação, salinidade e temperatura

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Produção de frutos e características morfofisiológicas de Schinus terebinthifolius Raddi., na região do baixo São Francisco, Brasil

Forest species with economic potential, such as aroeira (Schinus terebinthifolius Raddi.), require selection of individuals with superior characteristics for use in forest restoration projects and for establishment of commercial plantations. These plantations can contribute to the sustainability of natural populations of species in the remaining forest fragments, in areas of permanent preservation, legal reserves or other areas of ecological significance. It was evaluated the fruits' yield, morphometry and viability of seeds from 15 individuals of aroeira, collected in different fragments in the region of Lower São Francisco river, Sergipe State. The fruit yield was estimated by Fornier's intensity index, and the morphometric characteristics were obtained with a digital paquimeter and analytical balance. The viability and vigor were evaluated by germination percentage and germination speed index (GSI), under controlled conditions. The results of fruit yield were subjected to variance analysis, and the means were compared by Tukey (p <0.05). The other variables means were compared by Scott-Knott test (p<0.05). The individuals differed in Fournier's indices (indices 1, 2, 3 and 4) and in the size of fruits and seeds. The germination varied from 0 to 83% and the GSI from 0.00 to 0.98. The phenotypic differences observed among individuals for fruit yield, and morphophysiological characteristics can be used in forest restoration and establishment of provenances/progenies tests, aiming discrimination of superior material for future commercial plantations.

Germinação de sementes de romäzeiras (Punica granatum L.) de acordo com a concentração de giberelina

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Superação da dormência de sementes de Tucum (Astrocaryum huaimi Mart.)

The objective of this study was to evaluate the effect of immersion for varying periods in different concentrations of gibberellic acid and separate methods of scarification on the germination of seeds tucum. In the first trial, testing different soaking periods (24 and 48 hours), different forms of soaking (fast and slow) and different concentrations of gibberellic acid (0, 100 and 200 mg L-(1)) compared to the control (water) under completely randomized design in a factorial 2x2x3. The second experiment evaluated the different scarification treatments being: physical (seed coat removal in the hilar region with the aid of a scalpel), chemical (sulfuric acid 98 PA for 2:04 minutes) and thermal (hot water at approximately 98 degrees C and cold water at about 2 degrees C for 4 minutes). In the first trial were evaluated % of contaminated seeds (seeds infected by microorganisms) and hard seeds (who did not start the germination process, but not soiled), and in the second we assessed germination percentage (%) every two days for three months; germination Speed Index (GSI), time to occurrence of 50 % germination (T50) and Emergency Speed Index (ESI). The use of gibberellic acid was ineffective in promoting germination of Tucum (Astrocaryum Huaimi Mart.). Scarification treatments were effective in promoting germination and emergence of seedlings in the nursery and the most efficient physical removal scarification of the seed coat in the hilar region with the highest percentage of germination.

STORAGE OF Handroanthus umbellatus SEEDS

Seed storage under controlled environmental conditions represents one of the most important lines of research to be applied on short-lived forest species as Handroanthus. The present research aimed to identify the most suitable seed storage conditions and longevity behavior of Handroanthus umbellatus seeds subject to the following storage treatments: packaging permeable paper bags under a no-controlled laboratory temperature and humidity (control) and multiwall semipermeable bag at temperatures of -18 degrees C ,1 degrees C and 25 degrees C. Seeds were dried to 6.3% of water content. Stored seeds were evaluated every three months until 24 months for water content, germination percentage and vigor utilizing first counting test. Seeds of T. umbellata are orthodox, with low longevity under natural conditions, once they remain viable for less than 5 months. The best conditions of seed preservation of these species were obtained by storage at -18 degrees C in multiwall bags. Under these conditions physiological seed quality remains unchanged for a 24-month period.

Germinação de sementes e desenvolvimento inicial de Erythrina mulungu (Mart. ex. Benth)

The aim of this study was to determine the best pre-germination treatments for seeds and the best size container for seedlings growing of coral tree Erythrina mulungu (Mart. ex. Benth). Among the treatments applied to seeds, scarification with sulfuric acid during 10 minutes and cutting stylus in the region opposite to hilum resulted, respectively, in highest values of germination percentage (82.8% and 82.1%) and rates of germination speed (1.15 and 1.71). The biometric variables indicated no effect of container size on leaf area and dry mass plants. At 63 days after sowing, although with Dickson quality score statistically similar (mean 0.26), only plants grown in small and large bags reached the diameter collect close to 5 mm, minimum recommended for field planting. According to the results, for initial development of coral tree, it is recommended pre-seed treatment with sulfuric acid commercial, sowing in plastic bags of 17 x 20 cm, and wait 63 days before planting in the field.

Expressão de genes no embrião e endosperma durante a germinação de sementes de lobeira (Solanum lycocarpum St. Hill)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Fisiologia da germinação das cipselas heteromórficas em Bidens L

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Intensidades luminosas e profundidade de Semeadura na emergência e desenvolvimento de espécies de plantas daninhas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)