Effect of Aerial Parts Extracts of (Haloxylon ammodendron) on Germination and Some Morphophysiological Characteristics of (Nitraria schoberi L) Seeds

Germination is the first stage of plant growth affected by environmental conditions. So the plant’s allelopathic effects on germination of seeds needs to be investigated. In order to evaluate the allelopathic effects of Haloxylon ammodendron shoot extract on seed germination of (Nitraria schoberi L.) a factorial experiment was conducted in a completely randomized design. In this study, aqueous extracts of the aerial parts of Haloxylon ammodendron concentrations in zero, 1.25, 2.5, 5, 10 and 15 grams per liter were investigated on seed germination on (Nitraria schoberi L). The results showed that germination under different concentrations of aqueous extracts of the aerial parts of Haloxylon ammodendron had significant differences. So that by increasing extracts concentration, germination percentage, germination rate, seed vigor, seedling root length and shoot decreased. Different treatments of aerial part of Haloxylon ammodendron had different inhibitory effect on seed germination of (Nitraria schoberi L.), and decreased it. The highest inhibition was observed at concentrations of 10 and 15 grams per liter of aqueous extract. However, the inhibition was higher in 15 grams per liter of aqueous extract treatment than other treatments and stopped growth. As, the number of germinated seeds and seedlings length was superior compared to control. In summary, the results showed a direct correlation between the number of normal seedlings of (Nitraria schoberi L.) and concentration of aerial part of Haloxylon ammodendron.