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THE WAVELENGTH DEPENDENCE OF MASSIVE CAROTENE SYNTHESIS IN DUNALIELLA BARDAWIL (CHLOROPHYCEAE) 1
Author(s) -
BenAmotz Ami,
Avron Mordhay
Publication year - 1989
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1989.00175.x
Subject(s) - carotene , dunaliella , chlorophyceae , biology , light intensity , botany , algae , chlorophyta , optics , physics
Dunaliella bardawil Ben‐Amotz & Avron accumulates high concentrations of β‐carotene when grown under high light intensity. The β‐carotene is composed mainly of 9‐cis and all‐trans β‐carotene. Accumulation of β‐carotene and an increase in the ratio of the 9‐cis to the all‐trans isomer are strongly dependent on the light intensity under which the algae are cultivated but are independent of light quality within the photosynthetically active radiation range. Cells grown under continuous red (>645 nm) or white light of 500 W·m −2 reach a value of about 32 pg β‐carotene·cell −1 and a ratio of 9‐cis to all‐trans β‐carotene of around 2, whereas cells grown under low red or white light intensity of 25 W·m −2 contain about 3 pg·cell −1 and a ratio of isomers of around 0.3.