Y. Kishima et al., EVIDENCE THAT BLUE-LIGHT INDUCES BETALAIN PIGMENTATION IN PORTULACA-CALLAS, Plant cell, tissue and organ culture, 43(1), 1995, pp. 67-70
The wavelength range that activates betalain pigmentation has been stu
died following selection of light inducible betalain producing callus
lines originating from Portulaca sp. 'Jewel' seedlings. Light sources
with different wavelengths were used to irradiate the callus, resultin
g in blue light being effective in inducing betalain pigmentation. In
addition, when UV light was combined with blue light, some calluses fr
om this cell line showed high production of the pigment. This is a fir
st report that betalain pigmentation in callus was induced by blue and
blue/UV lights.