02186naa a2200277 a 450000100080000000500110000800800410001910000190006024501730007926000090025252013370026165000230159865000220162165000170164365000130166065000170167365000120169065000200170265000120172265300230173465300250175765300210178270000180180370000200182177300670184119505652023-06-13       2012    bl uuuu     u00u1 u    #d1 aREIS, R. C. R.  aMobilization of reserves and germination of seeds of Erythrina velutina Willd. (Leguminosae - Papilionoideae) under different osmotic potentials.h[electronic resource]  c2012  aSome 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.  aErythrina velutina  aNatural resources  aWater stress  aCaatinga  aGerminação  aMulungu  aRecurso natural  aSemente  aCarbono de reserva  aProteínas solúveis  aStresse hídrico1 aDANTAS, B. F.1 aPELACANI, C. R.  tRevista Brasileira de Sementesgv. 34, n. 4, p. 580-588, 2012.