Data/hora: 07/06/2024 03:49:30

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