Effects of light wavelength on growth and reproduction of the gametophytes of Laminaria japonica Aresch
光质对海带配子体生长发育影响的研究

Responses of the gametophytes of Laminaria japonica Aresch to blue, green, red and white lights were investigated using the gametophytes from the collection of zoospores. The blue light play the most important role in the growth and reproduction of the gametophytes, followed by the green light, and the red light had positive promotion effects on the growth but little effects on the reproduction. In a certain range, the growth rate was increased with increased light intensity.The number of protonema clone gametophyte began to increase when the blue light was over 600lx, green light over 1600lx,and red light over 1500lx. The reproduction of the gametophytes was improved with the increase of the light-intensity, then were slowed down as the filaments increased, and came to rise again afterwards.