Resumo

ALVAREZ-HOLGUIN, Alan; MORALES-NIETO, Carlos Raúl; MELGOZA-CASTILLO, Alicia  e  MENDEZ-ZAMORA, Gerardo. Germination of sideoats grama (Bouteloua Curtipendula) genotypes under different osmotic pressures. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.10, pp.161-168. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n10.898.

The objective was to evalúate the germination rate of sideoats gamma (Bouteloua curtipendula) geno types under different osmotic pressure levels. The genotypes used were El Reno (Re), Niner (Ni), Vaughn (Va), Kansas-6113 (K-13), Kansas-6107 (K-07), ecotype 689 (E-689) and ecotype 592 (E-592). The osmotic agent employed was mannitol. The osmotic pressure levels were; 0.0, -0.7, -1.4 and -2.1 Megapascals (MPa). The variables evaluated were germination percentage (GE), germination speed Índex (GSI), radíele length (RL) and plumule length (PL). The native genotypes (E-592 and E-689) and VA showed the highest resistance to water stress. The genotype K-07 presented the lowest GE and GSI, while Ni did not germinate under -2.1 MPa. Based on the results, E-592, E-689 and Va can be considered for their inclusión on grassland rehabilitation programs. However, due to their speed germination it is recommended to use them in mixture with Re or K-13.

Palavras-chave : Ecotype; mannitol; megapascals; native grass; water stress.