Study of Drought Stress of Grain Sorghum (Sorghum bicolor L. C.V. Kimia) on Self-Allelopathic Potential

پژوهشهای زراعی ایران

Article 1, Volume 9, Issue 2 - Serial Number 22, July 2011, Pages 151-157

Document Type: Research Article

DOI: 10.22067/gsc.v9i2.10986

Authors

O Younesi^* ; F Sharifzade; A Ahmadi

Abstract

In order to evaluate the effects of different intensities of drought stress on allelopathic potential of grain sorghum (Kimia) two field and lab experiments were conducted at research farm and laboratory of College of Crop and Animal Science, University of Tehran. Experiment was conducted with a factorial arrangement based on completely randomized design with three replications. Experimental factors including: drought stress (1: control, 2: vegetative and reproductive stages, 3: flowering, 4: dough stage), different concentrations of aqueous extracts (0 (control), 5%,10%,25%,40%) and organs of plant (seed, shoot). The effects of all treatments and their interactions on studied traits were significant. Sever drought stress at vegetative and reproductive stages had significant effects on allelopathic potential. The lowest measured traits showed in this treatment. By an increase in extract concentration to 40%, germination percentage, germination rate, radicle and plumule length reduced significantly. There was no significant difference between extract of shoot and seed in low concentration. The extracted materials from shoots had more inhibitory effect than that of seeds, especially when higher concentrations of solution were applied in bioassay germination test. The result showed that the plants which were exposed to drought stress from vegetative stage synthesized more inhibitors in their tissues