Ischaemum rugosum Salisb. germination reaction to environmental and chemical stimuli

Germinación de Ischaemum rugosum Salisb. en respuesta a estimulos ambientales y químicos

The effect of temperature, light, metabolic substances and scarification on the Ischaemum rugosum Salisb germination were evaluated. The germination tests were performed in germination boxes with distilled water using a completely randomized design with three replicates. The results indicated that the after the imbibition phase Ischaemum rugosum Salisb., presents a latency period or ¨plateau¨ about 12 to 48 hour after water adsorption is initiated. Germination percentages were affected significantly by extreme temperatures (10 and 50 °C), the far-red light exposure had a positive effect on the number of germinated seeds (Pr< 0.05). Scarification had a significant effect on emergency with respect to chemical treatment. Metabolic substances, such as gibberellins (AG ₃) and Potassium Nitrate (KNO₃), showed higher emergency percentages. Based on the results, it can be inferred that Ischaemum rugosum Salisb. seeds present a typical photoblastic species behavior and the importance of physical factors, such as absence of the seed coat and the stimulus of metabolic substances on seed germination.

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