Microbiological and nutritional analysis of lettuce crops grown on the International Space Station

Researchers have been exploring ways to grow fresh produce on space missions as a way of providing astronauts with nutritious food and dietary variety during long-term stays. A plant growth chamber called "Veggie" has been developed for this purpose, allowing crops like leafy greens to be grown in the unique environment aboard the International Space Station (ISS). In a recent study conducted on Earth at Kennedy Space Center and using samples from ISS experiments, scientists investigated whether these space-grown plants could safely supplement astronauts' diets. They found that while there were diverse microbial communities in the plant tissues grown aboard the ISS, none of them posed a risk to human health as no harmful pathogens were detected. Moreover, chemical analysis showed significant changes in nutrient content and antioxidant levels compared to Earth-grown plants.

The research paper presents a comprehensive study on cultivating leafy greens aboard the International Space Station (ISS) using an innovative plant growth chamber known as "Veggie." The primary objective of this investigation was to assess whether in situ crop production could supplement astronauts' diets, providing fresh produce and potential nutritional benefits. The study employed three Veggie experiments conducted on the ISS at Kennedy Space Center with lettuce leaf tissue as test subjects. These tests aimed to analyze microbial communities within these crops grown in space-based conditions while ensuring astronaut safety by detecting no human pathogens present. The researchers utilized next-generation sequencing on the Illumina MiSeq platform for identifying fungal genera, revealing that Proteobacteria, Bacteroidetes, and Actinobacteria phyla dominated these communities with potential differences at lower taxonomic levels between host plant species. Chemical analyses of the crops showed significant changes in elemental content (e.g.