| Abstrakt: |
Haematococcus pluvialis produces astaxanthin in response to light quality of illumination. To better understand the responses to the combinations of monochromatic red and blue light, the growth, cell differentiation, substance productions, and photosynthetic features defined by the chlorophyll-a (Chl-a) fluorescence techniques were explored. The results demonstrated that combined monochromatic light allowed for the observation of accelerated cell maturation and higher astaxanthin accumulation of H. pluvialis. At treatment of red: blue = 3:4 (3R4B), the content and production of astaxanthin were 1.58% and 15.28 mg/L, respectively, which were 2.1 and 2.2 times greater than at white light (control, W). Investigation into the photosynthetic performance of H. pluvialis provided evidence that red light impeded the transport of electrons from QA to QB and from PQ to the acceptor side of PSI, increased NPQ, and decreased the comprehensive performance indices of PIABS and PITOTAL. The combination of monochromatic light with a high proportion of blue light improved electron transfer from QA to QB and from PQ to the acceptor side of PSI, increased PIABS and PITOTAL, decreased φDo and NPQ related to thermal dissipation, significantly decreased OEC centers activity. Due to the greatly reduced NPQ and elevated qP and QYss, the combined monochromatic light with a modest proportion of blue light was able to achieve high photosynthetic activity, accelerated cell maturity, and significant astaxanthin accumulation. [ABSTRACT FROM AUTHOR] |
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