Effects of spaceflight on polysaccharides of Saccharomyces cerevisiae cell wall.
Freeze-dried samples of four Saccharomyces cerevisiae strains, namely, FL01, FL03, 2.0016, and 2.1424, were subjected to spaceflight. After the satellite's landing on Earth, the samples were recovered and changes in yeast cell wall were analyzed. Spaceflight strains of all S. cerevisiae strains showed significant changes in cell wall thickness (P < 0.05). One mutant of S. cerevisiae 2.0016 with increased biomass, cell wall thickness, and cell wall glucan was isolated (P < 0.05). The spaceflight mutant of S. cerevisiae 2.0016 showed 46.7%, 62.6%, and 146.0% increment in biomass, cell wall thickness and beta-glucan content, respectively, when compared to the ground strain. Moreover, growth curve analysis showed spaceflight S. cerevisiae 2.0016 had a faster growth rate, shorter lag phase periods, higher final biomass, and higher content of beta-glucan. Genetic stability analysis showed that prolonged subculturing of spaceflight strain S. cerevisiae 2.0016 did not lead to the appearance of variants, indicating that the genetic stability of S. cerevisiae 2.0016 mutant could be sufficient for its exploitation of beta-glucan production.
Liu
Hong-Zhi
HZ
Institute of Agro-food Science and Technology, Chinese Academy of Agriculture Sciences, Beijing, 100193, People's Republic of China. lhz0416@hotmail.com
Wang
Qiang
Q
Liu
Xiao-Yong
XY
Tan
Sze-Sze
SS
D018533:Biomass; D002473:Cell Wall / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D005936:Glucans / Q000378:metabolism; D009154:Mutation; D011134:Polysaccharides / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D013026:Space Flight
D005936:Glucans; D011134:Polysaccharides