Putrescine Mitigates the Biomass-β-Carotene Conflict in <i>Dunaliella salina</i> Under Thermal Stress.

ABSTRACT: Heat-induced β-carotene synthesis in Dunaliella salina typically compromises biomass accumulation, resulting in a biomass-β-carotene trade-off. This study demonstrates that exogenous putrescine (Put) alleviates this conflict through temperature-dependent mechanisms. At 28 °C (optimal for growth), 10^-6 M Put increased biomass by 9.52% and β-carotene yield by 10.72%, probably by accelerating electron transport and relatively mitigating the loss of photosynthetic function. At 34 °C (optimal for β-carotene synthesis), 10^-7 M Put enhanced biomass by 9.68% and β-carotene yield by 35.71% through a process associated with nitric oxide (NO) accumulation, involving antioxidant synergy and controlled reactive oxygen species (ROS) signaling, which activated photoprotective

SUBMITTER: Tang J 

PROVIDER: S-EPMC12734997 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature