Activation of CO Assimilation During Photosynthetic Induction is Slower in C Than in C Photosynthesis in Three Phylogenetically Controlled Experiments

Overview

Journal Front Plant Sci

Date 2023 Jan 23

PMID 36684779

Authors

Lucia Arce Cubas

Richard L Vath

Emmanuel L Bernardo

Cristina Rodrigues Gabriel Sales

Angela C Burnett

Johannes Kromdijk

Affiliations

Soon will be listed here.

Abstract

Introduction: Despite their importance for the global carbon cycle and crop production, species with C photosynthesis are still somewhat understudied relative to C species. Although the benefits of the C carbon concentrating mechanism are readily observable under optimal steady state conditions, it is less clear how the presence of C affects activation of CO assimilation during photosynthetic induction.

Methods: In this study we aimed to characterise differences between C and C photosynthetic induction responses by analysing steady state photosynthesis and photosynthetic induction in three phylogenetically linked pairs of C and C species from , , and genera. Experiments were conducted both at 21% and 2% O to evaluate the role of photorespiration during photosynthetic induction.

Results: Our results confirm C species have slower activation of CO assimilation during photosynthetic induction than C species, but the apparent mechanism behind these differences varied between genera. Incomplete suppression of photorespiration was found to impact photosynthetic induction significantly in C , whereas in the and C species, delayed activation of the C cycle appeared to limit induction and a potentially supporting role for photorespiration was also identified.

Discussion: The sheer variation in photosynthetic induction responses observed in our limited sample of species highlights the importance of controlling for evolutionary distance when comparing C and C photosynthetic pathways.

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