TOLERANCE OF PLANTS GROWN ON HUMAN MINERALIZED WASTE TO CHANGE IN AIR TEMPERATURE.

Paper number

IAC-08.A1.5.5

Author

Prof. Jean-Bernard GROS, Université Blaise Pascal, France

Coauthor

Mr. Alexander A. Tikhomirov, Russian Academy of Sciences, Russia

Coauthor

Dr. Sofia Ushakova, Russia

Coauthor

Dr. Valentin Shikhov, Russia

Coauthor

Dr. Yurii Kudenko, Russia

Coauthor

Dr. Tamara Golovko, Russia

Coauthor

Dr. Igor Zakhozhii, Russia

Year

2008

Abstract

The main objective of a LSS is to supply a crew with food, water and oxygen, and to eliminate its waste. The goal is to achieve the highest degree of closure of the system using controlled processes offering a high level of reliability and flexibility. Enhancement of closedness of biological life support systems (BLSS) including plants relies on increased regeneration of gas, water and plant waste, and utilization of solid and liquid human waste
Clearly, robustness of those LSS subject to a stress factor will substantially be determined by robustness of the plants component of the phototrophic unit. 
The present work was aimed at estimating heat resistance of the plants grown on human waste. Human exometabolites mineralized by hydrogen peroxide in alternative electromagnetic field were used as a nutrient solution for the plants. We investigated the possible increase of the plants heat resistance by changes of PAR intensity during the stress-factor effect. At the ages of 15 and 25 days, plants were subjected to a change in air temperature (from 22-24°C to 44°C) under different PAR intensities for 4 hours. The state of the plants photosynthetic apparatus was estimated by external carbon dioxide gas exchange and fluorescence measurements. The increase of plants irradiance during the high temperature period demonstrated its protective action both for the leaves photosynthetic apparatus and for further plants growth and development. The productivity of the plants subjected to temperature change at 250 W/m2 of PAR did not differ from that of the control, whereas the productivity of the plants subjected to the same change in darkness was two times lower. Heat resistance of reproductive organs of 25-day plants was significantly lower than that of 15-day plants subjected to similar light-temperature conditions. 

Abstract document

IAC-08.A1.5.5.pdf

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