Abstract
Use of plants in advanced life support requires models of crop growth to analyze data, to evaluate areas for improvement, and, for design and engineering, to predict the gas exchanges of crops. We used data from experiments at Utah State University and the Kennedy Space Center for wheat (Triticum aestivum L.) and examined it for time dependence of the major three components in the energy cascade: photosynthetic photon absorption, canopy quantum yield, and carbon use efficiency. From the Utah State data, we developed a model with a total of five trends: absorption increasing until canopy closure, then constant; quantum yield as constant, then decreasing during senescence; carbon use as constant. This system probably is the lower limit of simplicity to which a model can be reduced and yet provide substantial utility. We demonstrated this utility by using the model to predict photosynthesis and respiration for experiments at Kennedy Space Center. The most uncertainty arose in predicting a start time for the senescent decrease of canopy quantum yield. The model should be generally applicable to other crops grown in controlled environments, as a generic tool for the design of life support systems.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Wheat photon absorption rose to canopy closure and then remained constant.
- Taxon
- wheat
Triticum aestivume1 - Outcome
- absorptione0
- Direction
- increasinge0
- Qualifier
- until canopy closure, then constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“absorption increasing until canopy closure, then constant”
e1“for wheat (Triticum aestivum L.)”
Claim · model-written summary
Wheat canopy quantum yield remained constant and then declined during senescence.
- Taxon
- wheatTriticum aestivume1
- Outcome
- quantum yielde0
- Direction
- decreasinge0
- Qualifier
- during senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantum yield as constant, then decreasing during senescence”
e1“for wheat (Triticum aestivum L.)”
Claim · model-written summary
Wheat carbon use efficiency was constant in the model trends.
- Taxon
- wheatTriticum aestivume2
- Outcome
- carbon usee0
- Direction
- constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carbon use as constant”
e1“carbon use efficiency”
e2“for wheat (Triticum aestivum L.)”
Claim · model-written summary
The energy-cascade model predicted wheat photosynthesis and respiration for Kennedy Space Center experiments.
- Taxon
- wheatTriticum aestivume1
- Outcome
- predict photosynthesis and respiratione0
- Setting
- Kennedy Space Centere0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We demonstrated this utility by using the model to predict photosynthesis and respiration for experiments at Kennedy Space Center.”
e1“for wheat (Triticum aestivum L.)”
Claim · model-written summary
The largest model uncertainty was the start of the senescent decline in canopy quantum yield.
- Taxon
- wheatTriticum aestivume1
- Outcome
- predicting a start time for the senescent decrease of canopy quantum yielde0
- Direction
- most uncertaintye0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most uncertainty arose in predicting a start time for the senescent decrease of canopy quantum yield.”
e1“for wheat (Triticum aestivum L.)”
Claim · model-written summary
The authors suggest the model could apply generally to crops in controlled environments.
Verbatim
e0“The model should be generally applicable to other crops grown in controlled environments, as a generic tool for the design of life support systems.”