Biologia da polinização e sistema reprodutivo de Passiflora coccinea Aubl. Em Manaus, Amazonas, Brasil1

Abstract

RESUMO -Foi estudada a biologia da polinização e o sistema reprodutivo de Passiflora coccinea uma Passifloraceae comum na região Amazônica, conhecida popularmente por maracujá-poranga ou tomé-assu. Este estudo foi realizado em uma área perturbada, na Estação Experimental de Silvicultura Tropical do INPA (03º06'08" S, 59º58'54" W), em agosto e setembro de 1999. Dados de morfometria, horário de abertura e tempo de vida das flores foram obtidos. Diariamente reprodução desta espécie de maracujá é a xenogamia visto que não foram produzidos frutos por apomixia e por autogamia. A taxa natural de produção de frutos aumentou de 15% para Palavras-chave: beija-flores, biologia floral, Passifloraceae.Pollination Biology and Breeding System of Passiflora coccinea Aubl. in Manaus, Amazonas, Brazil.ABSTRACT -Pollination biology and breeding system of Passiflora coccinea, a Passifloraceae common in the Amazonian region, popularly known as maracujá-poranga or tomé-assu, were studied in a clearing at the INPA's forestry experimental station (03º06'08" S, 59º58'54" W) in August and September 1999. Data were obtained on floral morphology, blooming time and life span of the flower. Visiting animals, kind of foods taken, visiting time and frequency were the fruits in the area was noted. The flower of P. coccinea presents a syndrome of the ornithophily since it has diurnal anthesis, is red, does not possess any odour, and presents large amounts of nectar. The hummingbirds Amazilia sp. and Phaethornis superciliosus were considered to be its pollinators. Two species of Hymenoptera and Lepidoptera were considered to be pollen and species' breeding system, since fruits were not produced through autogamy and apomixis.

Floral, reproductive and pollinators biology of <i>Myrcianthes pungens</i> (Berg) Legrand, neglected species

“…These results show that the anthers presented significant color changes through the exposure to ammonia hydroxide, which shows the presence of Acta Scientiarum. Biological Sciences, v. 41, e43904, 2019 flavonoids that absorb ultraviolet light, thus contrasting with the ultraviolet light reflecting regions, characterizing in this case the floral resource guides (Storti, 2002). The odor of guabiju tree flowers is concentrated in the male structures (anther / pollen), and it has been maintained since the beginning of the anthesis and lasts for an average period of 8 hours.…”

“…The contrast difference observed is due to flavonoid-like pigments that absorb Acta Scientiarum. Biological Sciences, v. 41, e43904, 2019 ultraviolet light while the other parts of the flower reflect it, allowing floral visitors to identify and locate the resources (Storti, 2002).…”

BIOLOGIA FLORAL E REPRODUTIVA DE Agapanthus africanus (L.) HOFFMANNS (LILIACEAE)

“…Posteriormente, era colocada a lamínula e observada ao microscópio. O pólen era considerado viável, quando havia alteração de cor dele para o vermelho (3).…”

“…No teste da reflexão dos raios ultravioleta para a detecção dos guias de néctar da plantas em estudo, foram selecionadas flores em diferentes estágios de desenvolvimento, sendo elas expostas ao hidróxido de amônio por aproximadamente 5 minutos. A alteração de partes da planta para a coloração roxa indicaria a presença de guias de néctar (3).…”

Floral and reproductive biology and pollinators of Campomanesia guazumifolia (Cambess.) O. Berg., neglected species

“…The test with ammonium hydroxide (NH 4 OH) was realized for the identification of floral resource guides. The contrast difference when observed occurs due to the absorption of ultraviolet light by flavonoid type pigments, while the other parts of the flower reflect it, allowing floral visitors to identify and locate the resources (Storti, 2002). As a complementary test, the camera was fitted with ultraviolet light (luminescence), for direct observation of fresh flowers (post-anthesis), identifying the structures reflecting or absorbing ultraviolet light.…”