Temperature response of bundle-sheath conductance in maize leaves
Xinyou Yin1, Peter E L van der Putten2, Steven M Driever2
1Centre for Crop Systems Analysis, Department of Plant Sciences, Wageningen University, PO Box 430, 6700 AK Wageningen, The Netherlands Xinyou.Yin@wur.nl.
Journal of Experimental Botany
|March 13, 2016
Summary
Bundle-sheath conductance (g bs) in C4 plants is temperature-dependent, peaking around 34°C. Understanding this response is crucial for predicting C4 crop productivity under global warming and optimizing photosynthesis.
Area of Science:
- Plant Physiology
- Photosynthesis Research
- Climate Change Adaptation
Background:
- C4 photosynthesis relies on bundle-sheath conductance (g bs) to minimize photorespiration.
- Predicting C4 crop yields under rising global temperatures necessitates understanding g bs temperature sensitivity.
Purpose of the Study:
- To investigate the temperature response of bundle-sheath conductance (g bs) in maize.
- To determine the optimal temperature for g bs and its response pattern.
Main Methods:
- Utilized a C4 photosynthesis model integrated with gas exchange and chlorophyll fluorescence measurements.
- Analyzed data across a temperature range of 13.5-39 °C under varying O2 concentrations.
- Incorporated kinetic constants for C4 enzymes and C3 mesophyll conductance (g m) temperature responses.
Main Results:
- Bundle-sheath conductance (g bs) exhibited significant variation with leaf temperature.
- The temperature response of g bs was accurately modeled by a peaked Arrhenius equation, with an optimum around 34 °C.
- Mesophyll conductance (g m) temperature responses had minimal influence on g bs temperature patterns.
Conclusions:
- Maize bundle-sheath conductance (g bs) shows a distinct temperature optimum crucial for C4 photosynthesis.
- Further research is required to validate these findings using independent methods and across diverse C4 species.
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