Abstract:
:Although light and salt stresses are known to enhance the biosynthesis of astaxanthin in certain green algae, the mechanism of their action remains largely unknown. Here we report the regulation of the genes encoding phytoene desaturase (PDS), carotenoid hydroxylase (CHYb), and carotenoid ketolase (BKT) in the green alga Chlorella zofingiensis Dönz under light or sodium chloride (NaCl) stress. High-light illumination (150 μmol photons · m(-2) · s(-1) ) up-regulated the transcripts of PDS, CHYb, and BKT and greatly enhanced the biosynthesis of zeaxanthin, canthaxanthin, and astaxanthin. In contrast, sodium chloride stress only up-regulated the transcript of BKT and enhanced the biosynthesis of canthaxanthin and astaxanthin. High-light and NaCl stresses were revealed to result in an increase in the intracellular reactive oxygen species (ROS) level. By applying chemically generated ROS to the algal cells, we determined that (1) O2 specifically up-regulated the CHYb gene, whereas •OH up-regulated the PDS and BKT genes. We suggest that high-light and NaCl stresses may stimulate the generation of different ROS, which in turn trigger the up-regulation of specific carotenogenic genes and the enhanced biosynthesis of carotenoids in C. zofingiensis.
journal_name
J Phycoljournal_title
Journal of phycologyauthors
Li Y,Huang J,Sandmann G,Chen Fdoi
10.1111/j.1529-8817.2009.00689.xsubject
Has Abstractpub_date
2009-06-01 00:00:00pages
635-41issue
3eissn
0022-3646issn
1529-8817journal_volume
45pub_type
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