Physiological properties of Neoporphyra haitanensis conchocelis in response to different temperature

Abstract

Temperature is one of the major factors controlling the growth and development of Pyropia. Here, we set out to discover the most important changes arising at the growth rate, ultrastructure, lipids and low‐molecular‐weight carbohydrates of Neoporphyra haitanensis conchocelis under low temperature (12°C), mid‐temperature (23°C) and high temperature (28°C). Results showed that lower growth rate was at 12°C, while the conchosporangia formed under 28°C. Thicker cell wall was under 28°C. Larger size of plastoglobuli exhibited under 12°C. Less total contents of monogalactosyldiacylglycerols, digalactosyldiacylglycerols, sulfoquinovosyldiacylglycerols and phosphatidylinositols were under 12°C, while more total contents of phosphatidylcholines, phosphatidylethanolamines, phosphatidylglycerols and triglycerides were under 12°C. The ratio of unsaturated to saturated fatty acids in phosphatidylcholines, phosphatidylethanolamines, phosphatidylglycerols, monogalactosyldiacylglycerols, digalactosyldiacylglycerols, and sulfoquinovosyldiacylglycerols increased at 12°C and decreased at 28°C. The contents of floridoside and isofloridoside were more under 12 and 28°C than that under 23°C. Taken together, these findings indicated that temperature affected the physiological properties of Neoporphyra haitanensis.