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Have We Selected for Higher Mesophyll Conductance in Domesticating Soybean?
Elena A Pelech1,2, Samantha S Stutz2, Yu Wang3
1Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA.
Plant, Cell & Environment
|October 28, 2024
Summary
Modern soybean varieties show significantly higher mesophyll conductance (gm) than their wild ancestors. This improvement enhances photosynthesis and water use efficiency, crucial for sustainable agriculture.
Area of Science:
- Plant Physiology
- Crop Science
- Photosynthesis Research
Background:
- Soybean is a vital global protein source, necessitating yield increases to prevent habitat expansion.
- Mesophyll conductance (gm) is critical for CO2 diffusion to Rubisco, impacting photosynthesis and water use.
- Understanding gm variability is key for improving crop productivity and sustainability.
Purpose of the Study:
- To investigate variability in mesophyll conductance (gm) within soybean germplasm.
- To determine if domestication and breeding have influenced gm in elite soybean cultivars.
- To compare gm between a modern cultivar and its wild ancestors.
Main Methods:
- Concurrent measurements of gas exchange and carbon isotope discrimination (∆13C).
- Comparison of a modern elite soybean cultivar (LD11) with four ancestral *Glycine soja* accessions.
- Assessment of gm under both steady-state and light-induced conditions.
Main Results:
- Mesophyll conductance (gm) significantly limited soybean photosynthesis under both steady-state and light-induction conditions.
- The modern cultivar LD11 exhibited a gm approximately twice that of its wild ancestors.
- Increased gm in LD11 correlated with enhanced leaf photosynthetic CO2 uptake and water use efficiency.
Conclusions:
- Significant variability in mesophyll conductance (gm) exists within soybean germplasm.
- Soybean domestication and breeding have substantially increased gm, contributing to improved photosynthetic efficiency.
- Elevated gm represents a key trait for developing higher-yielding and more water-use-efficient soybean crops.
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