CHLOROPHYLL FLUORESCENCE AS AN INDICATOR OF CROP GROWTH EFFICIENCY
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CHLOROPHYLL FLUORESCENCE AS AN INDICATOR OF CROP GROWTH EFFICIENCY Nicole Williams, Biochemistry Mentor: Susan Moran, Maria Pilar Cendrero Mateo Arizona Space Grant Consortium Symposium Tucson, Arizona April 20-21, 2012
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CHLOROPHYLL FLUORESCENCE AS AN INDICATOR OF CROP GROWTH EFFICIENCY. Nicole Williams, Biochemistry Mentor: Susan Moran, Maria Pilar Cendrero Mateo Arizona Space Grant Consortium Symposium Tucson, Arizona April 20-21, 2012. Introduction. Photosynthesis efficiency (P E ) - PowerPoint PPT Presentation
Transcript of CHLOROPHYLL FLUORESCENCE AS AN INDICATOR OF CROP GROWTH EFFICIENCY
CHLOROPHYLL FLUORESCENCE AS AN INDICATOR OF CROP GROWTH EFFICIENCY
Nicole Williams, BiochemistryMentor: Susan Moran,
Maria Pilar Cendrero MateoArizona Space Grant Consortium Symposium
Tucson, Arizona April 20-21, 2012
IntroductionPhotosynthesis efficiency (PE)
Can be used to measure crop health.
Knowing PE can better guide farmers in applying their resources to yield better profits.
X Difficult to directly measure
FLuorescence EXplorer
FLEX
Fluorescence
Hypotheses1. Fluorescence is negatively correlated with heat dissipation.
2. Fluorescence is an indicator of plant photosynthesis efficiency.
ExperimentCrops Alfalfa (CUF 101)
Treatment No stress conditions
Measurements
November 4th and November 6th 2011Fluorescence baseline measurement at 5 amFluorescence measurements from 7 am to 4 pm
Study site University of Arizona’s Campus Agricultural Center (CAC).
Mike Ottman
LICOR 6400
Measurements:- Photosynthesis efficiency- Fluorescence- Heat dissipation
Measurements
Data Analysis• Time was spent analyzing the data from each
leaf using graphs from the data collected by each leaf.
• At this point it became clear there were instances of cloud cover or similar circumstances that influenced our measurements.
Averages
Bad Data
Results
0
5
10
15
0 2 4 6 8 10Diurnal Measurement
Fluo
resc
ence
(a.u
.)
0
500
1000
1500
2000
0 2 4 6 8 10
Diurnal Measurement
PARi
(μm
ol m
-2s-1
)
0
0.5
1
1.5
2
0 2 4 6 8 10
Diurnal Measurement
Heat
Dis
sipa
tion
(a.u
.)
0
0.2
0.4
0.6
0.8
0 2 4 6 8 10Diurnal Measurement
Phot
osyn
. Effi
cien
cy
We found a negative relationship between fluorescence and heat
dissipation.
r2 pval
0.66 0.0260
2
4
6
8
10
0 0.5 1 1.5
Heat Dissipation (a.u.)
Fluo
resc
ence
(a.u
.)
Fluorescence and photosynthesis efficiency were strongly correlated.
r2 pval
0.88 0.00170
2
4
6
8
10
0.4 0.5 0.6 0.7
Photosynthesis Efficiency
Fluo
resc
ence
(a.u
.)
Concluding Remarks• Fluorescence can provide information to guide
farmers in their crop management.
• These findings support plans for use of the FLEX satellite to produce global maps of fluorescence.
• Future work: – Fluorescence sensitivity to
• Crop type• Plant stress• Environmental conditions
FLEX
FLuorescence EXplorer
Thank You!
