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Anne Visscher answered on 12 Oct 2015:
Hi 11P SHS,
I don’t think genetic modification is necessary to allow seeds to germinate and grow into plants in a zero-gravity environment: many experiments with seeds and plants have already been done in zero-gravity and it is now thought that plant growth in the absence of gravity is not a problem. See for example the salad that astronauts grew a few months ago on the ISS: http://www.space.com/30209-astronauts-eat-space-lettuce.html
Anne
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