Résumé
The effect of different organic solvent extracts of Azolla pinnata on some growth parameters and chemical aspects show that there is little difference in the percentage of germination. Alcohol, toluene or acetone extracts have stimulating effects, mostly on growth parameters, while ethyl acetate or methylene chloride extracts attenuated the growth in their low concentration whereas high concentrations seemed to be beyond the threshold level of stimulation. Alcohol, toluene and acetone extracts were effective in stimulating water absorption. Water translocation was also stimulated by alcohol or acetone extracts but toluene extract was suppressive. The total chlorophyll of the cotyledons increased in presence of alcohol, toluene or acetone extracts. The Extracts by ethyl acetate or methylene chloride attenuated the chlorophyll a/b ratio. In the meantime, the five different extracts remarkably enhanced total carbohydrate accumulation at their highest concentration. Sucrose synthesis was highly activated by toluene extract whereas that of starch formation was not affected. Only the acetone extract [at 4 percent level], toluene extract [at 12 percent level and ethyl acetate extract at 12 percent and 20 percent level] attenuated protein accumulation