PJB-2019-583
ALTERATION OF THE GERMINATION RATE, SEEDLING GROWTH AND GST ACTIVITY OF QUINCLORAC-RESISTANT BARNYARD GRASS (ECHINOCHLOA CRUSGALLI) UNDER SALINITY STRESS
Lamei Wu
Abstract
Owing to the heavy use of quinclorac for years, more and more quinclorac-resistant barnyard grasses are arising in the middle and lower reaches of the Yangtze River, China. In this study, the effects of salinity stress (NaCl) on the germination and seedling growth of barnyard grass was determined by the growth chamber experiment. The results showed that a significant decrease in the germination rate and fresh weight of the plants, as well as the length of the roots and young shoots occurred in the types with better quinclorac-resistant. Without the treatment of NaCl, no significant differences were detected between quinclorac-resistant and -susceptible barnyard grass biotypes. A further study with spectrophotometer showed that the salinity treatment resulted in an increasing GST activity in all barnyard grass biotypes, which are more obvious in those resistant biotypes. This study demonstrated that how quinclorac-resistance affected the biological characters of barnyard grass, and the increasing quinclorac-resistance is possibly associated with the increased metabolic activity of GST in barnyard grass.
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