be more suitable for lettuce cultivation in the controlled
environment.
© 2014 The Committee on Space Research (COSPAR). Published by Elsevier Ltd. All rights reserved.
1. Introduction
It is a significant issue of manned spaceflight to achieve selfsufficiency
of life support materials including food, air and water
for astronauts, and it’s universally regarded that the viable
approach is to build a controlled ecological life support system
(CELSS). The plants play the role in producing food and O2 in the
CELSS (Liu et al., 2008; Nelson, 2005).