Data/hora: 16/06/2024 06:38:54

Provedor de dados: 	14	
País: 	Brazil	
Título: 	Germinação de sementes de Ipomoea cynanchifolia após armazenamento em diferentes temperaturas e escarificação.	
Autores: 	SANTOS, I. R. I.; SALOMAO, A. N.	
Data: 	2019-12-13	
Ano: 	2019	
Palavras-chave: 	Escarificação; Criopreservação; Dormência; Cryopreservation.	
Resumo: 	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.	
Tipo: 	Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)	
Idioma: 	Português	
Identificador: 	38011

http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1116845	
Editor: 	Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2019.	
Relação: 	Embrapa Recursos Genéticos e Biotecnologia - Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)

(Embrapa Recursos Genéticos e Biotecnologia / Boletim de Pesquisa e Desenvolvimento, 354)	
Formato: 	21 p.