[H-CG28] Circulation of materials in closed bio-ecosystems by the systems of organisms.

[HCG28-P02] Growth of a terrestrial cyanobacterium, Nostoc sp. HK-01, in the poor nutrient mediums similar to the environment on Mars

*Kotomi Inoue¹, Shunta Kimura¹, Jyunpei Isaka⁴, Mayumi ARAI², Hiroshi Katoh³, Seigo Sato¹, Kaori Tomita-Yokotani¹ (1.Graduate School of Life and Environmental Sciences, University of Tsukuba, 2.National Museum of Emerging Science and Innovation, 3.Mie University, 4.School of Life and Environmental Sciences, University of Tsukuba)

Keywords:closed bio-ecosystems, Martian regolith simulant, terrestrial cyanobacterium

A terrestrial cyanobacterium, Nostoc sp. HK-01, has several abilities; photosynthesis, nitrogen fixation, usefulness as food, and space environmental tolerances. HK-01 may be utilized for bio-chemical circulation in closed bio-ecosystems, including Mars. When we introduce HK-01 to the environment on Mars, we need to define the growth of HK-01 in an environment which lacks nutrition. In this study, we tested whether akinetes (dormant cells) of HK-01 grow using components of their dead cells or/and Martian regolith simulant. We will discuss the possibility that colonies of HK-01 can be grown in an environment such as Mars.