Data/hora: 14/06/2024 19:36:18

Biblioteca(s): | Embrapa Recursos Genéticos e Biotecnologia.
Data corrente: | 13/12/2019
Data da última atualização: | 13/12/2019
Autoria: | SANTOS, I. R. I.; SALOMAO, A. N.
Afiliação: | IZULME RITA IMACULADA SANTOS, Cenargen; ANTONIETA NASSIF SALOMAO, Cenargen.
Título: | Germinação de sementes de Ipomoea cynanchifolia após armazenamento em diferentes temperaturas e escarificação.
Ano de publicação: | 2019
Fonte/Imprenta: | Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2019.
Páginas: | 21 p.
Série: | (Embrapa Recursos Genéticos e Biotecnologia / Boletim de Pesquisa e Desenvolvimento, 354)
Idioma: | Português
Conteúdo: | Germination of Ipomoea cynanchifolia seeds after storage at different temperatures and scarification. Abstract ? Ipomoea cynanchifolia Meisn., Convolvulaceae, is a wild relative of Ipomoea batatas (L.) Lam. (sweet potato). In this study, seeds with 7.8% water content were stored in a germinator (25 °C), a freezer (-18 °C) and in liquid nitrogen (-196 °C) for seven days. After storage, seeds underwent a decontamination treatment for 15 min, followed by three rinses with sterile distilled water, and after that seeds were scarified, by means of a cut in the opposite pole to the hilum made with nail pliers. Non-scarified (control, ESC-) and scarified (ESC +) seeds were sown in Petri dishes between filter paper discs soaked with water equivalent to three times the mass of the discs, and taken to a growth room at 25 ± 2 °C, with a 12h photoperiod. Observations occurred daily and counts occurred at 3, 7, 15 and 30 days after sowing using botanic (radicle protrusion) or technological (formation of a normal seedling with a green hypocotyl, cotyledons and root) criteria. Regardless of the storage temperature, germination percentages of ESC- seeds were low, with highest percentage of germination (15%) for seeds stored at -196 °C. In contrast, germination percentages for ESC+ seeds were high, ranging from 97% to 100%. These results show the occurrence of dormancy in I. cynanchifolia seeds, the need for scarification to promote seed germination and seed tolerance to storage at temperatures below freezing.
Palavras-Chave: | Escarificação.
Thesagro: | Criopreservação; Dormência.
Thesaurus Nal: | Cryopreservation.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/207000/1/Boletim-Germinacaodesementes-3543.pdf
Registro original: | Embrapa Recursos Genéticos e Biotecnologia (CENARGEN)
Exemplares: | CENARGEN - (38011-1) - UPE - FL - DD -  -  -  - DIS