May 13 2022
Scientists Grow Plants in Lunar Soil
After years of requesting tiny samples of lunar soil, plant scientists at the University of Florida were finally granted 12 grams to work with (out of the 382 kg brought back during the Apollo missions). They had proposed a simple experiment – could seeds germinate and plants grow in lunar soil? It turns out the answer is yes, sort of.
The researchers used Arabidopsis, or rockcress, which is a genus that contains the first plant to have its entire genome sequenced and is therefore a favorite of plant biologists. They added nutrient rich water to one gram pots of lunar soil and planted Arabidopsis seeds in them. As controls they planted the same seeds with the same nutrients in regular soil, and simulated lunar and Martian soil, plus Earth soil but from extreme environments. All of the seeds sprouted. For about the first six days the plants all seemed to be doing equally well, but then it became clear that the plants growing in lunar soil were smaller, more varied in size, and were showing signs of stress.
The experiment was therefore a partial success – the plants grew surprisingly well but did not thrive in the lunar soil. Because they used Arabidopsis, they were able to also track gene expression in the plants. The plants growing in lunar soil had increased expression of genes related to stress, reinforcing the conclusion that there is something about the lunar soil that is not friendly to the plants, causing them to react as if they were growing in an extreme environment.
Interestingly, the researchers had two different type of lunar soil from different locations. One type is referred to as “mature” lunar soil, which was exposed directly to the solar wind. They also had not mature lunar soil, in which the plants fared a little better.