Effect of Light Intensity on Growth and Physiological Properties of Free-living Conchocelis of <i>Pyropia haitanensis</i>

WENG Zu-tong

doi:10.19303/j.issn.1008-0384.2019.04.017

Volume 34 Issue 4

Jul. 2019

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Article Navigation > Fujian Journal of Agricultural Sciences > 2019 > 34(4): 488-494

WENG Zu-tong. Effect of Light Intensity on Growth and Physiological Properties of Free-living Conchocelis of Pyropia haitanensis[J]. Fujian Journal of Agricultural Sciences, 2019, 34(4): 488-494. doi: 10.19303/j.issn.1008-0384.2019.04.017

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WENG Zu-tong. Effect of Light Intensity on Growth and Physiological Properties of Free-living Conchocelis of Pyropia haitanensis[J]. Fujian Journal of Agricultural Sciences, 2019, 34(4): 488-494. doi: 10.19303/j.issn.1008-0384.2019.04.017

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Effect of Light Intensity on Growth and Physiological Properties of Free-living Conchocelis of Pyropia haitanensis

doi: 10.19303/j.issn.1008-0384.2019.04.017

WENG Zu-tong

Fujian Provincial Fishery Technical Extention Center, Fuzhou, Fujian 350002, China

Received Date: 2019-02-03
Rev Recd Date: 2019-03-10
Publish Date: 2019-04-28

Abstract

Abstract

Objective Intensity of LED light for optimal growth of free-living conchocelis of Pyropia haitanensis (FCP) was studied. Method The effects of varied light intensities (i.e., 10, 20, 40, 80 or 100 μmol·photons m^-2·s^-1) using LED on the growth, maximal quantum efficiency (Fv/Fm) on PS Ⅱ, content of photosynthetic pigments as well as the photosynthesis and antioxidant enzymes of Shenfu No.2, a new cultivar of P. haitanensis, were determined. Result After 25 d of culturing, the weight of algae increased with increasing intensity of illumination and peaked when 80 μmol·photons m^-2·s^-1 was applied. As the weight reached the maximum, the Fv/Fm on PS Ⅱ was also at its highest level. On the other hand, the contents of chlorophyll a, carotenoids, and phycoerythrin decreased gradually as the light intensity increased. No significant differences on phycocyanin among the groups were observed. The greatest activities of CA and RubisCO in the algae were observed under 40 μmol·photons m^-2·s^-1 followed by 80 μmol·photons m^-2·s^-1 treatment before a decline. Upon an increase on light intensity, the activities of superoxide anion radicals and SOD decreased to the lowest level under 80 μmol·photons m^-2·s^-1 and then raised again. Conclusion The vegetative filaments of FCP cultured under 80 μmol·photons m^-2·s^-1 light appeared to render the highest algae growth rate and Fv/Fm, lowest activities of superoxide anions and SOD, and strongest activities of RubisCO and CA.
- Pyropia haitanensis,
- free-living conchocelis,
- light intensity,
- growth,
- physiological characteristics

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References(31)

References

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