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The effect of humic acids and their different molecular mass fractions on germination in sunflower |
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| Authors: | Ester Casenave de Sanfilippo J. A. Argüello G. A. Orioli |
| Affiliation: | (1) Laboratorio de Fisiología Vegetal, Universidad Nacional de Santiago del Estero, Belgrano (S) 1912, 4200 Santiago del Estero;(2) Laboratorio de Fisiología Vegetal, Universidad Nacional de Córdoba, CC 509, 5000 Córdoba;(3) Laboratorio de Fisiología y Ecologia Vegetal, Departamento de Ciencias Agrarias, Universidad Nacional del Sur, Bahía Blanca, Argentina |
| Abstract: | Low molecular mass humic acid fractions caused a decrease in the germination rate. Only the highest concentration of humic acid solution decreases the soaking of fruits. Neither sodium content nor water and osmotic potential can account for that decrease. Seed respiration was increased in the presence of humic acids and their medium molecular mass fraction. This increase did not produce an increment in embryonic growth possibly as a result of interference in the respiration chain or decoupling in the oxidative phosphorylation. |
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