Treatment

Light

Enhanced UV-B radiation

He-Ne laser irradiation

Dark culture

CK

8 h/d

-

-

16 h/d

B

8 h/d

8 h/d

-

16 h/d

L

8 h/d

-

2 min/d

16 h/d

BL

8 h/d

8 h/d

2 min/d

16 h/d