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Interaction of Carbon Dioxide Enrichment and Soil Moisture on Photosynthesis, Transpiration, and Water Use Efficiency of Soybean

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Title Interaction of Carbon Dioxide Enrichment and Soil Moisture on Photosynthesis, Transpiration, and Water Use Efficiency of Soybean
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Creator Madegowda Madhu
Jerry L. Hatfield
 
Subject Elevated Carbon Dioxide, Evaporation, Interactions, Photosynthetic Rate, Soil Moisture, Soybean, Water Use Efficiency
 
Description Not Available
Soybean (Glycine max (L.) Merrill) is one of the most important oil and protein sources in the
world. Interactive effect of elevated carbon dioxide (CO2) and soil water availability potentially
impact future food security of the world under climate change. A rhizotron growth chamber experiment
was conducted to study soil moisture interactions with elevated CO2 on gaseous exchange
parameters of soybean under two CO2 concentrations (380 and 800 μmol•mol−1) with three soil
moisture levels. Elevated CO2 decreased photosynthetic rate (11.1% and 10.8%), stomatal conductance
(40.5% and 36.0%), intercellular CO2 concentration (16.68% and 12.28%), relative intercellular
CO2 concentration (17.4% and 11.2%), and transpiration rate (43.6% and 39%) at 42
and 47 DAP. This down-regulation of photosynthesis was probably caused by low leaf nitrogen
content and decrease in uptake of nutrients due to decrease in stomatal conductance and transpiration
rate. Water use efficiency (WUE) increased under elevated CO2 because increase in total dry
weight of plant was greater than that of water use under high CO2 conditions. Plants under normal
and high soil moisture levels had significantly higher photosynthetic rate (7% to 16%) favored by
optimum soil moisture content and high specific water content of soybean plants. Total dry matter
production was significantly high when plants grown under elevated CO2 with normal (74.3% to
137.3%) soil moisture level. Photosynthetic rate was significantly and positively correlated with
leaf conductance and intercellular CO2 concentration but WUE was significantly negatively correlated
with leaf conductance, intercellular CO2 concentration and transpiration rate. However, the
effect of high CO2 on plants depends on availability of nutrients and soil moisture for positive
feedback from CO2 enrichment.
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Date 2020-05-08T10:48:58Z
2020-05-08T10:48:58Z
2014-04-02
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/35483
 
Language English
 
Relation Not Available;
 
Publisher Not Available