![]() ![]() Seedlings were germinated in the same spaceflight hardware during 4 days with a day/night cycle of illumination, and then half of the samples were exposed to 2 days of darkness and the other group to 2 days of continuous red light ( Figure 1A). Two environmental conditions (light) are compared here, both of them as part of the SG Earth control reference experiment using the European Modular Cultivation System (EMCS). These ground control findings, as part of the ESA/NASA Seedling Growth spaceflight experiments, will determine the basis for the identification of genetic backgrounds enabling an adaptive advantage for plants in future space experiments. Thus, we show that nucleolin stress-related gene NUC2 can compensate for the environmental stress provided by darkness in nuc1 plants, whereas nuc2 plants are not able to provide a complete response to red light. ![]() Here, in a series of ground studies, we have used mutants from the two Arabidopsis nucleolin genes ( NUC1 and NUC2, nucleolar regulators of ribosome biogenesis) to better understand their role in adaptive response mechanisms to stress on Earth. Spaceflight produces deleterious effects on plant cells, particularly affecting ribosome biogenesis, a complex stress-sensitive process coordinated with cell division and differentiation, known to be activated by red light. Understanding plant adaptive responses to the space environment is a requisite for enabling space farming. ![]()
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