Light dependence of carboxylation capacity for C3 photosynthesis models

Title:

Light dependence of carboxylation capacity for C3 photosynthesis models

Creator:

Bunce, J. A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:8b586ced-5139-4071-be94-cb3f1b18cb64
uuid:8b586ced-5139-4071-be94-cb3f1b18cb64
issn:0300-3604
doi:10.1007/s11099-016-0215-9

Subject:

oxid uhličitý, teplota, fazole, carbon dioxide, temperature, beans, změna klimatu, climate change, modeling, C3, CO2, quinoa, elektronová doprava, mezibuněčná koncentrace CO2, list, common bean, electron transport, intercellular CO2 concentration, leaf, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

C3 photosynthesis at high light is often modeled by assuming limitation by the maximum capacity of Rubisco carboxylation (VCmax) at low CO2 concentrations, by electron transport capacity (Jmax) at higher CO2 concentrations, and sometimes by triose-phosphate utilization rate at the highest CO2 concentrations. Net photosynthetic rate (PN) at lower light is often modeled simply by assuming that it becomes limited by electron transport (J). However, it is known that Rubisco can become deactivated at less than saturating light, and it is possible that PN at low light could be limited by the rate of Rubisco carboxylation (VC) rather than J. This could have important consequences for responses of PN to CO2 and temperature at low light. In this work, PN responses to CO2 concentration of common bean, quinoa, and soybean leaves measured over a wide range of temperatures and PPFDs were compared with rates modeled assuming either VC or J limitation at limiting light. In all cases, observed rates of PN were better predicted by assuming limitation by VC rather than J at limiting light both below and above the current ambient CO2. One manifestation of this plant response was that the relative stimulation of PN with increasing the ambient CO2 concentration from 380 to 570 µmol mol-1 did not decrease at less than saturating PPFDs. The ratio of VC to VCmax at each lower PPFD varied linearly with the ratio of PN at low PPFD to PN at high PPFD measured at 380 µmol(CO2) mol-1 in all cases. This modification of the standard C3 biochemical model was much better at reproducing observed responses of light-limited PN to CO2 concentrations from pre-industrial to projected future atmospheric concentrations., J. A. Bunce., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

484-490

Source:

Photosynthetica | 2016 Volume:54 | Number:4

Harvested from:

CDK

Metadata only:

false