Effect of light on growth of Hydrilla verticillata in eutrophic water

By carrying out a laboratory simulation experiment,the effect of light on the growth and physiology of Hydrilla verticillata in eutrophic water was studied,and a light condition suitable for promoting Hydrilla verticillata was determined.Three light intensity levels,daily mean light intensities of 6 284 lx,3 913 lx,and 3 196 lx,were set,and the growth indexes and antioxidant enzyme activity of Hydrilla verticillata in different light conditions were measured.The results indicated that Hydrilla verticillata survived in all three light conditions,and each condition had good treatment effects on the water quality.There was no significant difference between the growth indexes and antioxidant enzyme activity of Hydrilla verticillata at the levels of 6 284 lx and 3 913 lx,but both were significantly different from the values at the level of 3 196 lx.Hydrilla verticillata suffered stress most severely and thus had the worst growth conditions at the level of 3 196 lx.Light may inhibit the growth of Hydrilla verticillata when it reaches a certain intensity.