Effects Of UV Radiation And Salt Stress On The Growth And Microscopic Characteristics Of Enteromorpha Prolifera

The effects of ultraviolet (UV) radiation and low salt stress on the growth,microscopic characteristics and ultrastructure of Enteromorpha prolifera thalli were investigated in this paper.Thallus of Enteromorpha prolifera were applied in the grads experiment, and their accretion were applied as indexes to denote which condition was more suitable for growth. Microscopic characteristics were observed by microscope. Ultrastructure were observed by electron microscopic.The results showed that UV radiation could inhibit the growth of E. prolifera, with the thalli experiencing negative growth, and such inhibition at the salinity of 24 was higher than that at the salinity of 12. After high intensity of UV exposure, the frond became thinning, soft, scattered, and some cell damages were observed under microscope, with the contents spilling after death. While the low intensity of UV exposure had little effect on the growth rate. Four groups of salinity gradients, 0, 6, 12, 24 were set in this experiment, and the experiment lasted 42 days. During the early 21 days, the salinity of 0 showed no significant effects on the growth, with less changes of plant color. But with the culture time extending, the algae became soft and loose, and the plants appeared yellow and then white until death. The plants at other salinities were normal, indicating that the frond of E. prolifera had a certain tolerance to low salinity stress, but not long tolerate.