Effects of different light qualities and light intensities on growth,biochemical composition and chlorophyll fluorescence parameters of red alga Gracilaria arcuata
ZHOU Ziyang
TANG Lei
ZHANG yajian
WANG Zhendong
CHEN Yajing
MAO Yunxiang
Abstract：Gracilaria arcuata is an important tropical coral reef macroalga,which is widely distributed in south China Sea,and possesses important economic and ecological values.However,studies on its growth characteristics are scarce.The effects of different light qualities and light intensities on the growth of G.arcuata were analyzed in this study.The alga was treated with white,blue,green and red lights.It was found that green light caused the highest relative growth,reaching 5.85±0.17％/d,significantly higher than that caused by other light qualities(P＜0.05).The fat-soluble pigment con-tent of G.arcuata under green light was significantly higher than that under blue and red lights,and phycobiliproteins and soluble proteins were the highest under white and blue lights.However,there was no significant difference in actual photosynthetic efficiency Y(Ⅱ)among light qualities.The rela-tive growth rate of G.arcuata was the highest(10.25±0.11％/d)under the light intensity of 200μmol/(m2s).Under this intensity,the content of phycobiliproteins,the maximal photochemical yield Fv/Fm and the actual photosynthetic efficiency Y(Ⅱ)were the highest.We explored the growth of G.arcuata under different light qualities and light intensities,which may provide a theoretical basis for studying the light adaptation mechanism of G.arcuata.At the same time,our findings may provide a reference for further exploration of the growth characteristics and artificial cultivation of G.arcuata.
Keywords：Gracilaria arcuatalight qualitylight intensitygrowth
Publication Date：2026-02-25
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 78-86 )