Barnyard Grass Stress Triggers Changes in Root Traits and Phytohormone Levels in Allelopathic and Non-Allelopathic Rice

Despite the growing knowledge concerning allelopathic interference with barnyard grass, little is understood regarding competitive physiological mechanisms of interaction between rice and herbicide-resistant grass. A hydroponic system was employed to investigate root morphological traits different phytohormonal changes in non-allelopathic cultivars when co-planted quinclorac-resistant -susceptible respectively. The results show that shoot biomass were greater PI. Barnyard grass stress induced an increase PI at 7 14 days co-culturing Especially under increased by 23% 68%, respectively, 37% 34%, In terms morphology, exhibited a significantly higher fine-root length, diameters <0.5 mm, number tips, longer tips compared LE. response consistent SA JA content. obvious accumulation observed two stress, amounts significant decrease auxin (IAA) abscisic acid (ABA) content detected from co-culture stress. Additionally, highly positive correlations found content, tip length 0–0.5 mm rice.