Combined artificial high-silicate medium and LED illumination promote carotenoid accumulation in the marine diatom Phaeodactylum tricornutum

Table 2 Effect of two different levels of silicate in media (PT-7 and PT-8) on the accumulation of carotenoids in P. tricornutum under elevated light intensities

Photon flux (μmol/m²/s)	128 (%)	204 (%)	255 (%)
β-Carotene
PT-7	100	257.6 ± 0.4*	312.7 ± 23.4*
PT-8	100	239.6 ± 0.5*	475.3 ± 19.2*
Diadinoxanthin
PT-7	100	123.4 ± 0.4*	125.1 ± 4.1*
PT-8	100	75.3 ± 4.5*	72.8 ± 6.6*
Violaxanthin
PT-7	100	119.7 ± 0.6*	151.3 ± 2.2*
PT-8	100	96.5 ± 9.1^NS	75.9 ± 7.3*
β-Cryptoxanthin
PT-7	100	90.5 ± 11.2^NS	90.6 ± 7.9^NS
PT-8	100	144.6 ± 23.4*	157.5 ± 2.9*
Phoenicoxanthin
PT-7	100	95.1 ± 2.9^NS	109.4 ± 2.0^NS
PT-8	100	55.0 ± 1.5*	57.6 ± 6.2*

Data were averaged from either two or three independent experiments (mean ± SE). Contents of carotenoid species in cells growing on PT-7 and PT-8 medium under a pure (or 100%) red light with an intensity of 128 μmol/m²/s were set as references (100%), respectively
Asterisk (*) indicates statistically significant difference between its low light condition and higher (204 or 255 μmol/m²/s) light condition
NS represents no statistically significant difference between its low light condition and higher (204 or 255 μmol/m²/s) light condition

ISSN: 1475-2859