Efecto de la salinidad en la germinación y emergencia de semillas de parchita (Passiflora edulis f. flavicarpa)

Revista de la Facultad de Agronomia (Impact Factor: 0.07). 01/2007;
Source: OAI

ABSTRACT Resumen Se evaluó el efecto de la salinidad sobre la germinación y la emergencia de plantas de la parchita (Passiflora edulis f. flavicarpa). Los tratamientos salinos fueron agua destilada, 0,75; 2,5; 4,5 y 6,5 dSÀzm-1 para la prueba de germinación. La prueba de emergencia se realizó bajo una estructura de techo transparente, donde se aplicaron los tratamientos salinos desde 0,75; 2,5; 4,5 y 6,5 dSÀzm-1. Las evaluaciones se realizaron diariamente en los dos ensayos establecidos. El porcentaje de germinación se afectó negativa y significativamente con el incremento de las concentraciones salinas. El inicio de la emergencia, el período en que se alcanza el 50% de la emergencia total y el lapso en que transcurre del 10 al 90% de la emergencia no fueron afectados, mientras que, el porcentaje de emergencia total mostró diferencias significativas, tendiendo a disminuir al incrementarse la concentración total de sales. El mayor porcentaje de emergencia fue de 79% con la menor concentración (0,75 dSÀzm-1) y el menor de 48,6% correspondió al de 6,5 dSÀzm-1, el más salino.

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    • "The low humidity content of the seeds may have increased saline stress, causing a cessation of metabolism or inhibition of certain stages in the germination metabolic sequence (Smith and Comb, 1991). Meza et al. (2007), in Passiflora edulis f. flavicarpa, observed the same trend and found that the germination decreased with increased salt concentrations. Studies in Brazil, using eight water EC levels (ECw) of between 1 and 8 dS m -1 , showed that the seeds of passion fruits are moderately tolerant to salinity in terms of vigor and initial development of the plants (Loureiro et al., 2002). "
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    ABSTRACT: The purple passion fruit is propagated by seeds, but factors, such as hardiness and impermeability of the testa and salinity and pH of the soil, give rise to problems in germination and uniformity of seedlings. The objectives of the study were to evaluate the effect of different NaCl concentrations (0, 30, 60, 90, and 120 mM, corresponding to 0.8, 3.0, 6.0, 9.0, and 12.2 dS m-1) on the germination and emergence of purple passion fruit seeds. For the germination test, 50 seeds per Petri dish were used, which were watered with a saline solution weekly. A seed was considered germinated when the radicle reached 2 mm. In the case of seedling emergence, 50 seeds were sown in cleaned river sand at a 1 cm depth on polystyrene trays, covered with transparent plastic film. They were irrigated weekly with different NaCl concentrations and the electrical conductivity (EC) of the substrate was measured. A seedling was considered emerged when the hypocotyl was fully erect. The results showed significant differences, with germination being higher in seeds treated with 30 mM NaCl than in the control seeds, and no statistical differences for the 60 and 90 mM NaCl treatments. The emergence was significantly higher in the 0 (0.05 dS m-1 of the substrate) and 30 mM NaCl (0.71 dS m-1) treated seeds when compared with 60 mM (1.25 dS m-1), 90 mM (1.69 dS m-1) and 120 mM NaCl (2.30 dS m-1 of the substrate). There was a decline in the chlorophyll contents of the seedling cotyledons and an increased substrate EC with increasing NaCl concentrations.


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