Germinación y vigor de semilla de cinco especies de gramineas forrajeras con diferentes intensidades de salinidad

"El objetivo del presente trabajo de investigación es: Evaluar el efecto de diferentes niveles de salinidad en la germinación y vigor de semilla en cinco especies de gramíneas forrajeras, se realizó en laboratorio e invernadero, en la Universidad Autónoma Agraria Antonio Narro en Buenavista, Saltillo, Coahuila, a 25º 23' LN y 103º 01' LO, a una altitud de 1743 msnm. Se utilizo semilla de cinco especies de gramíneas forrajeras: Zacate Buffel., Rhodes, Pasto Toledo, Brizantha, Mulato II Y Tanzania. Los tratamientos evaluadosen ambas condiciones, fueron seis contracciones de sanilidad utilizando cloruro de potasio(KCI)."

"The aim of the present work of investigation is: To evaluate the effect of different levels of salinity in the germination and vigor of seed in five species of gramíneas forrajeras, was realized under greenhouse and laboratory conditions, in Buenavista, Saltillo, Coahuila, located at 25 º 23 ' LN and 103 º 01 ' LW, with an altitude of 1743 masl. We assayed five seed species of forage grasses, namely: Hay Buffel, Rhodes, Brizantha, Mulatto II and Tanzania. Under both conditions six concentrations of potassium chloride (KCl) were evaluated and then adjusted to electrical conductivities expressed as decisiemens/meter (dS/m). Treatments evaluated were: T1= Control (distilled water), T2= 5 dS/m, T3= 10 dS/m, T4= 15 dS/m, T5= 20 dS/m and T6= 25 dS/m. The variables analyzed were: Seed germination capacity (GC) by using a vigour test; Germination velocity index (GVI), Emergency velocity index (EVI), Plumule length average (PLA); Radicle length average (RLA) and Plantlet dry weight (PDW). The information obtained was analyed using a completely randomized design with a factorial arrangement and four replications; we used the statistical package SAS, version 6.0 (1989). Results indicated significant differences between grass species, since the observed responses in both environments were in high disparity among the studied variables. Also highly significant differences were detected among plant species, due to the fact that when they were subjected to increasing saline concentrations, there was a direct adverse effect on germination and seeds vigor. These results promoted an increasing number of seeds without germination hability and abnormal seedlings, likewise when we compared the results obtained under laboratory and greenhouse conditions, we arrived to the conclusion that the most tolerant species to the effect of induced salinity were Tanzania and Brizantha seeds, because they resulted less affected on germination and vigor when were grown in highly saline soil"