Reproductive biology and pollination of southeastern Brazilian Stanhopea Frost ex Hook. (Orchidaceae)

Autor(es)

Pansarin, Emerson Ricardo ^[1] ; Estanislau do Amaral, Maria do Carmo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Bot, Inst Biol, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FLORA; v. 204, n. 3, p. 238-249, 2009.
• Citações Web of Science: 20

Resumo

Reproductive biology and pollination of Stanhopea lietzei and Stanhopea insignis were studied ill a semi-deciduous mesophytic forest in the Serra do Japi (SJ), and in the coastal plain of Picinguaba. both in the State of Sao Paulo. Brazil. Floral morphology, pollination, breeding system and fruit set of both species were investigated. S. lietzei and S. insignis are pollinator-specific, being pollinated by male bees of Eufriesea (Apidae, Euglossini), which collect the fragrance produced by pluricellular osmophores at the base of the saccate hypochile. S. lietzei and S. insignis were pollinated by Eufriesea pulchra and Eufriesea purpurata, respectively. Observations using substances present in the floral fragrance of both studied species as chemical baits were also performed. E purpurata was attracted by benzyl alcohol, the major compound of the perfume of S. insignis, while E pulchra was attracted by none of the compounds used. Both Studied Stanhopea are self-compatible but pollinator dependent. Self-pollination, however, tends to be avoided by floral mechanisms. In experimental self- and cross-pollinations the proportion of fruit abortion was high and related to resource limitation. The reproductive success of S. lietzei and S. insignis was low as a consequence of deficient pollen transference while pollinator scarcity was the main factor. (C) 2008 Elsevier GmbH. All rights reserved. (AU)

• Processo FAPESP: 98/05097-0 - Estudo da biologia reprodutiva e morfologia floral de algumas espécies de Orchidaceae em ambientes diferentes no estado de São Paulo
• Beneficiário: Emerson Ricardo Pansarin
• Modalidade de apoio: Bolsas no Brasil - Mestrado