Effect of light quality on growth, ultrastructure, pigments, and membrane lipids of Pyropia haitanensis
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Effect of light quality on growth, ultrastructure, pigments, and membrane lipids of Pyropia haitanensis Xiujuan Wang 1 & Peng Zhang 2 & Yubo Wu 1
&
Li Zhang 1
Received: 10 March 2020 / Revised and accepted: 16 September 2020 # Springer Nature B.V. 2020
Abstract Light quality is an important factor on regulating growth and development of algae. Two trials were conducted to evaluate the effect of light quality on filmentous conchocelis (sporophyte in the heteromorphic life cycle) of Pyropia haitanensis. Trial I studied the effect of white, blue, and green light on growth rate, ultrastructure, pigments, and the membrane lipids of P. haitanensis. In trial II, the effect of white, blue, and green light was evaluated on the formation of P. haitanensis conchosporangia. In trial I, growth rate decreased 28.54% under blue light compared with white light, and no difference was observed under green and white light. Compared with white light, chlorophyll a and carotenoid reduced under blue (23.95%, 22.76%) and green (41.21%, 37.90%), and phycoerythrin and phycocyanin under green decreased 53.56% and 45.64%. The content of membrane lipids significantly decreased under blue (81.15%) and green (85.63%), and the ratio of unsaturated to saturated fatty acids decreased under blue and green. The cell wall under green light was thicker (0.153 ± 0.014 μm) than blue (0.117 ± 0.010 μm) and white light (0.121 ± 0.011 μm). Larger size of plastoglobuli exhibited under green (3.23 × 10−4 ± 1.95 × 10−4 μm3) than under white (3.97 × 10−5 ± 1.70 × 10−5 μm3) and blue light (1.41 × 10−4 ± 7.91 × 10−5 μm3). Starch granules occurred only under green light. In trial II, blue light enhanced conchosporangial branch formation, while green light inhibited conchosporangial branch formation compared with white light. Taken together, these findings indicated that light quality effected growth, ultrastructure, pigments, and lipids of P. haitanensis. Keywords Rhodopyta . Conchocelis . Conchosporangia . Light quality . Pigments . Membrane lipids
Introduction Light is one of the key ecological factors regulating algae growth and development, and the characteristics of light includes light quality, quantity, and duration. Light quality is one of the most important characteristics of light, and the growth and development of algae can be influenced by light quality. Red light can increase the growth rate of Porphyra leucosticta (Korbee et al. 2005) and carbon storage in Porphyra sp. (Figueroa et al. 1995). Blue light increased the docosahexaenoic acid content in both the exponential growth phase and the stationary growth phase of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10811-020-02264-4) contains supplementary material, which is available to authorized users. * Yubo Wu [email protected] 1
College of Life Science, Taizhou University, Taizhou 318000, China
2
Zhejiang Mariculture Research Institute, Wenzhou 325005, China
Tisochrysis lutea (del Pilar Sáanchez-Saavedra et al. 2016. Fifty percent of the gamet
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