Preliminary investigation on the response of raphanus sativus L. to various extracts of azolla pinnata L.

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

Allelopathic potentiality of lupinus seed extract on yield and chemical composition of soybean seeds

The allelopathic effect of aqueous extract of lupin [Lupinus terms cv. Giza 1] seeds at 5 percent, 15 percent and 25 percent concentration [w/v] on soybean after 30 days of seedling establishment could be effective in enhancing the production. The data illustrated that soybean seed yield was stimulated by lupin extract at 5 percent concentration, no appreciable changes with 15 percent level whereas the highest concentration [25 percent] showed an inhibitory effect .The promotion or reduction of soybean yield, caused by lupin extract treatments was paralleled with increased or decreased total protein and oil constituent of the seeds. The biochemical interference of lupin extract may afford greater possibilities for mechanism of allelopathic action that depends upon physiological response, capacity of soybean. This is reflected mostly on the primary and secondary metabolic products. So the 5 percent lupin extract has a positive allelopathic effect due to its ability to increase plant growth and to stimulate soybean yield production. This finding suggests that the potential beneficial involvement of lupin seed aqueous extract as crop-crop stimulator, by its application at lower concentrations after soybean emergence, should be effective in enhancing crop production

Effect of different concentrations of lupin seed extract on the growth criteria and pigmentation of soybean plant at different growth stages

This long-term greenhouse pot experiment study indicated that the application of lupin [Lupinus termis cv. Giza 1] extracts after 30 days of soybean seedling establishment could be effective in enhancing soybean production. Data revealed that soybean growth was stimulated by lupin extract of 5% concentration and no appreciable changes with 15% level, whereas the highest concentration [25%] showed an inhibitory effect. The extent of growth stimulation or inhibition by lupin extracts varied with the measured growth parameters. Regarding the pigments, the shoot of plants treated with lupin extracts contained less chlorophylls and carotenoids than the untreated plants. The magnitude of reduction increased with raising the lupin extract concentration and was greater in older than younger plants