Título:	Mobilization of reserves and germination of seeds of Erythrina velutina Willd. (Leguminosae - Papilionoideae) under different osmotic potentials.
Autoria:	REIS, R. C. R. DANTAS, B. F. PELACANI, C. R.
Afiliação:	RENATA CONDURU RIBEIRO REIS; BARBARA FRANCA DANTAS, CPATSA; CLAUDINÉIA REGINA PELACANI.
Ano de publicação:	2012
Referência:	Revista Brasileira de Sementes, v. 34, n. 4, p. 580-588, 2012.
Conteúdo:	Some environmental factors, including water availability, may influence seed germination. This study investigated the germination of E. velutina seeds submitted to different osmotic potentials and mobilization of reserves during water-stress. Scarified seeds were arranged in paper rolls and soaked in solutions of Polyethylene Glycol (PEG) prepared in osmotic potentials 0.0, -0.2, -0.4, -0.6, and -0.8 MPa and kept into a seed germinator, at 25 °C, and 12/12 h photoperiod (L/D), during 10 days. The percentage, mean time, mean speed, germination speed index; as well as the germination uniformity coefficient were assessed. During germination process the total soluble sugars, reducing sugars, soluble protein, and total amino acids were quantified in the cotyledon, hypocotyl and radicle of soaked seeds and cotyledons of quiescent seeds (control). There was influence of osmotic potential on E. velutina seed germination. The germination percentage remained at high levels until -0.6 MPa and above this osmotic potential there has been no germination. The mobilization of stored reserves of carbon and nitrogen in E. velutina seeds was also influenced by water-stress. There was sensitiveness between -0.2 and -0.6 MPa; however, the degradation and the mobilization of reserves was slower when the osmotic potential decreased.
Thesagro:	Recurso natural Caatinga Germinação Mulungu Semente
NAL Thesaurus:	Natural resources Water stress Erythrina velutina
Palavras-chave:	Stresse hídrico Proteínas solúveis Carbono de reserva
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPATSA)