Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 504654
Title Temperature response of bundle-sheath conductance in maize leaves
Author(s) Yin, Xinyou; Putten, Peter E.L. Van Der; Struik, Paul C.; Driever, Steven M.
Source Journal of Experimental Botany 67 (2016)9. - ISSN 0022-0957 - p. 2699 - 2714.
DOI https://doi.org/10.1093/jxb/erw104
Department(s) Crop Physiology
PE&RC
Centre for Crop Systems Analysis
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Diffusive resistance - maximum PEPc activity - maximum Rubisco activity - modelling - warming effect - Zea mays
Abstract

A small bundle-sheath conductance (g bs) is essential for the C4 CO2-concentrating mechanism to suppress photorespiration effectively. To predict the productivity of C4 crops accurately under global warming, it is necessary to examine whether and how g bs responds to temperature. We investigated the temperature response of g bs in maize by fitting a C4 photosynthesis model to combined gas exchange and chlorophyll fluorescence measurements of irradiance and CO2 response curves at 21% and 2% O2 within the range of 13.5-39 °C. The analysis was based on reported kinetic constants of C4 Rubisco and phosphoenolpyruvate carboxylase and temperature responses of C3 mesophyll conductance (g m). The estimates of g bs varied greatly with leaf temperature. The temperature response of g bs was well described by the peaked Arrhenius equation, with the optimum temperature being ~34 °C. The assumed temperature responses of g m had only a slight impact on the temperature response of g bs. In contrast, using extreme values of some enzyme kinetic constants changed the shape of the response, from the peaked optimum response to the non-peaked Arrhenius pattern. Further studies are needed to confirm such an Arrhenius response pattern from independent measurement techniques and to assess whether it is common across C4 species.

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