Asymbiotic seed germination and in vitro seedling development of the threatened orchid Hoffmannseggella cinnabarina

Autor(es)

Suzuki, Rogerio Mamoru ^[1] ; Moreira, Vania Carolina ^[1] ; Pescador, Rosete ^[2] ; Ferreira, Wagner de Melo ^[3]

Afiliação do(s) autor(es)

^[1] Res Ctr Orchidarium State, Inst Bot, BR-04301902 Sao Paulo - Brazil

^[2] Univ Fed Santa Catarina, Dept Fitotecnia, BR-88034001 Florianopolis, SC - Brazil

^[3] Fed Univ Tocantins, Enviromental Res Ctr NEAMB, BR-77500000 Porto Nacl, Tocantins - Brazil

• Tipo de documento: Artigo Científico
• Fonte: IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-PLANT; v. 48, n. 5, p. 500-511, OCT 2012.
• Citações Web of Science: 11

Resumo

Hoffmannseggella cinnabarina has not been found in the wild for the last 70 yr in the State of So Paulo and, therefore, wild populations of this native orchid are thought to be extinct. This investigation studied seed storage at a low temperature, in vitro germination, and seedling development of H. cinnabarina in order to establish an optimized protocol for propagation, and thus assure species conservation. Seeds of different ages were incubated on Knudson C (KC), Murashige and Skoog, and Vacin and Went media with or without 1 mu M of N-6-benzyladenine (BA) and exposed to either 12 or 16 h of light (30 mu mol m(-2) s(-1) at 26 +/- 2A degrees C). Seed surface sterilization was deleterious to 3-mo-old seeds and severely reduced the viability of the 4-mo-old seeds. More mature seeds were not affected by the sterilization procedure. In general, the germination of 4-, 5-, 6-, and 7-mo-old seeds increased when BA was added to the culture medium especially under 16 h of light. Germination rates were highest with 8- and 9-mo-old seeds, and application of BA failed to enhance germination rates further. Developmental studies revealed that this cytokinin reduced seed and protocorm mortality rates; however, protocorm development was negatively affected in its presence. Seedling development was more pronounced when KC medium with 16 h of light was used. Long-term seed storage at 4A degrees C did not provide promising results. The protocol described in this study proved to be efficient and relevant to in vitro seed germination and initial development of H. cinnabarina, and thus will contribute to conservation of this orchid species. (AU)

• Processo FAPESP: 06/61345-1 - Estudo comparativo da germinação assimbiótica e do desenvolvimento in vitro de plântulas de Hadrolaelia purpurata e Hoffmannseggella cinnabarina - espécies de orquídeas ameaçadas de extinção no Estado de São Paulo
• Beneficiário: Rogério Mamoru Suzuki
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/10485-3 - Estudo do desenvolvimento in vitro de plântulas de Hadrolaelia purpurata e Hoffmansegella cinnabarina - espécies de orquídeas ameaçadas de extinção no Estado de São Paulo
• Beneficiário: Vania Carolina Moreira
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico