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Biomass Production System (BPS)
06.05.09

Overview | Description | Applications | Operations | Results | Publications | Images

Experiment/Payload Overview

Brief Summary

The Biomass Production System (BPS) environmental control subsystems provides a complete growing environment for plants in microgravity. Results can lead to the development of regenerative life support systems on future exploration missions to the Moon or Mars.

Principal Investigator

  • Robert Morrow, Ph.D., Orbital Technologies Corporation, Madison, WI

    • Co-Investigator(s)/Collaborator(s)

    Information Pending

    Payload Developer


    Orbital Technologies Corporation, Madison, WI
    Ames Research Center, Moffett Field, CA
    Dynamac Corporation, Kennedy Space Center, FL

    Sponsoring Agency

    National Aeronautics and Space Administration (NASA)

    Expeditions Assigned

    |4|

    Previous ISS Missions

    ISS Expedition 4 was the first mission for the BPS hardware.

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    Experiment/Payload Description

    Research Summary

    • The Biomass Production System (BPS) environmental control subsystems were tested as potential hardware for regenerative life support system investigations.


    • The BPS was delivered to ISS and activated. The technology verification test (TVT) conducted in the BPS used one of four plant growth chambers (PGCs) to grow Brassica rapa (field mustard plant) in microgravity. Triticum aestivum (common bread wheat plant) was grown in the remaining PGCs for the Photosynthesis Experiment and System Testing and Operation (PESTO) investigation.


    • Plants grown inside the BPS were compared to plants grown in an Earth based BPS. The data obtained will increase the understanding of the use of plants in regenerative life support systems.

    Description

    The Biomass Production System (BPS) was developed as a precursor to systems capable of maintaining plant growth in microgravity for more than 90 days (e.g., planetary missions). The BPS objective was to validate plant growth system hardware functionality and performance, plant productivity and health, information acquisition, and experiment operations and support in microgravity. The BPS housed two experiments: the Technology Verification experiment and the Photosynthesis Experiment and System Testing and Operation (PESTO) experiment.

    Brassica rapa (field mustard) was the test species for the BPS. The BPS plant growth chambers (PGCs) contained plants that were started on the ground and that had already developed their photosynthetic apparatus, such as stoma, guard cells, and other structures found in the leaves. Samples taken from the plants were compared to data taken from previous ground-based experiments conducted using BPS.

    BPS tested the hypothesis that environmental control subsystems would provide a stress-free growing environment in microgravity. These technology validation studies provide a foundation on which to base the design of future plant growth units for station or future Exploration missions. These results can lead to the development of regenerative life support systems on future missions to the moon or Mars. While creating useful technology and science, BPS allowed students in grades Kindergarten through twelve to work as co-investigators on real space research. This research, known as "Farming in Space", examined the basic principles and concepts related to plant biology, agricultural production, ecology, and the space environment. Activities associated with this research encouraged curiosity in the sciences while teaching good scientific methodology.

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    Applications

    Space Applications

    The amount of food necessary to sustain a crew during a long duration mission to Mars would prohibitively increase the mass of spacecraft and the overall cost of the mission. Some of the crew's food would need to come from a selection of renewable crops grown in biomass production systems. The biomass production systems may also be used as a filtration system for water and atmospheric gases. Plant growth chambers would also offer a comforting, green reminder of Earth to a crew a long way from home.

    Earth Applications

    As less fertile land becomes available to grow food, alternative agricultural systems that efficiently produce greater quantities of high-quality crops will be increasingly important. Data from the operation of the BPS will advance greenhouse and controlled-environment agricultural systems and will help farmers produce better, healthier crops in a small space using the optimum amount of nutrients.

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    Operations

    Operational Requirements

    BPS consists of four plant growth chambers. The TVT for BPS operations grew Brassica rapa in one of the four BPS chambers. Each chamber has 264 cm square growth area, while the roots of the plants were placed 3 cm below the growth area. A total of 32 plants were grown for 73 days on ISS. The plants were exposed to 20 hours of light and 4 hours of dark daily at 24 degrees C and 78 percent relative humidity. A control group of plants were treated exactly as the experimental group on ISS. Although BPS is fully automated, the crew conducted periodic system checks and some support tasks.

    Operational Protocols

    Following the transfer of the BPS to EXpedite the PRocessing of Experiments to Space Station (EXPRESS) Rack, the crew refilled the water reservoirs as needed and periodically changed carbon dioxide canisters. Gas and liquid samples using ports in the growth chambers were taken weekly.

    During operations on Expedition 4, plant samples were taken for harvesting and fixation 21 days following BPS activation on ISS. The fixed samples were stowed in the ARCTIC freezer. The crew hand-pollinated blooms on the plants during flowering to ensure seed set. BPS was returned to Earth on STS-110/8A while the plants continued to grow.

    Data and near real-time video from inside the growth chambers were transmitted from BPS to the investigators via the Telescience Resource Kit (TReK) system. Student and teacher participants in the ISS Challenge: Farming in Space program were also able to view the real-time video from BPS. The participants conducted their own in-class plant growth experiments and were encouraged to share questions and data with other participants and members of the ISS Challenge support team.

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    Results/More Information

    During ISS Expedition 4, thirty-two germinating Brassica rapa plants were launched inside the BPS for the technology validation of the hardware. The Brassica rapa plants were grown for two growth cycles on the ISS. Brassica rapa tissue from the BPS was analyzed for general morphology, seed anatomy, storage reserves, carbohydrates, chlorophyll and root zone hypoxia. Overall, the BPS hardware performed as expected, providing an adequate environment for plant growth in microgravity (Iverson et al 2003).

    Following return of the BPS hardware to Earth, water from the nutrient delivery and humidity control systems was sampled, and the surfaces of the containment bags, root modules and plant material were swabbed for bacterial and fungal colonies to be compared to the hardware which remained on Earth. Data indicated insignificant differences between the bacterial and fungal species identified from the flight and ground hardware (Frazier et al. 2003).

    BPS tested the hypothesis that environmental control subsystems would provide a stress-free growing environment in microgravity. The specific categories tested included basic functionality, information acquisition, operations and support and component performance. If a requirement was not met in a category it was the result of one of the following: fan failure, loss of the humidity system or elevated root zone temperature (3 degrees C above shoot temperature). For the objectives that did not meet requirements the root cause was determined and design changes were made to implement on next generation hardware. These technology validation tests provide a foundation on which to base the design of future plant growth units for station or future Exploration missions (Morrow et al. 2004).

    Gross measure of growth, leaf chlorophyll, starch, and soluble carbohydrates confirmed comparable performance by the plants on the station with ground controls. Of particular interest were the differences between the immature seedlings. Immature seeds from station had higher concentrations of chlorophyll, starch, and soluble carbohydrates than the ground controls. Seed protein was significantly lower in the ISS material. Also, microscopy of immature seeds fixed on ISS showed embryos to be at a range of developmental stages, while ground control embryos had all reached the same stage of development. These differences could be attributable to differences in water delivery or reduced gas exchange due to lack of convection. These results suggest that the microgravity environment may affect flavor and nutritional quality on potential space produce (Musgrave et al. 2005).

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    Related Web Sites
  • Farming in Space

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    Publications

    Results Publications
    • Musgrave ME, Kuang A, Tuominem LK, Levine LH, Morrow R.C. Seed Storage Reserves and Glucosinolates in Brassica rapa L. Grown on the International Space Station. Journal of the American Society for Horticultural Science. 2005 ;130(6): 848-856.
    • Morrow RC, Iverson JT, Richter RC, Stadler JJ. Biomass Production System (BPS) Technology Validation Test Results. Transactions Journal of Aerospace 2004 1:1061-1070.
    • Frazier CM, Simpson JB, Roberts MS, Stutte GW, Fields NW, Melendez-Andrade J, Morrow RC. Bacterial and fungal communities in BPS chambers and root modules. SAE Technical Paper Series. 2003 Paper No. 03ICES-147.
    • Iverson JT, Crabb TM, Morrow RC, Lee MC. Biomass Production System Hardware Performance. SAE Technical Paper Series. 2003 Paper No. 03ICES-67.

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    Related Publications
    • Morrow RC, Stadler JJ. Analysis of Crew Interaction with Long-Duration Plant Growth Experiment. SAE Technical Paper Series Paper No. 03ICES-257. 2003
    • Morrow RC, Crabb TM. Biomass Production System (BPS) plant growth unit. Advances in Space Research. ;26(2):289-298. 2000

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    Images

    imageNASA Image: ISS004E11725 - Expedition Four Flight Engineer Daniel Bursch, in the Destiny U.S. Laboratory, harvests Brassica plants from plant growth chamber 2 as part of the Biomass Production System.
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    imageVideo screen shot of Brassica rapa, 36 days after planting on ISS during Increment 4.
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    imageNASA Image: ISS004E11712 - View of Brassica plants in plant growth chamber 2 grown as a part of the technical validation test in the Biomass Production System conducted onboard the International Space Station during Expedition 4.
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    imageNASA Image: ISS004E11721 - View of Brassica plants from plant growth chamber 2 being harvested as part of the technical validation test of the Biomass Production System conducted during ISS Expedition 4.
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    imageNASA Image: STS111E5026 - Astronaut Daniel W. Bursch, aboard the ISS is pictured at the Biomass Production System (BPS) on Endeavour's middeck.
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    Information Provided and Updated by the ISS Program Scientist's Office
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