Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants
Abstract Net photosynthetic CO2 assimilation rate (A n) decreases at leaf temperatures above a relatively mild optimum (T opt) in most higher plants. This decline is often attributed to reduced CO2 conductance, increased CO2 loss from photorespiration and respiration, reduced chloroplast electron tr...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-05-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-38496-4 |
| _version_ | 1797822736128540672 |
|---|---|
| author | Andrew P. Scafaro Bradley C. Posch John R. Evans Graham D. Farquhar Owen K. Atkin |
| author_facet | Andrew P. Scafaro Bradley C. Posch John R. Evans Graham D. Farquhar Owen K. Atkin |
| author_sort | Andrew P. Scafaro |
| collection | DOAJ |
| description | Abstract Net photosynthetic CO2 assimilation rate (A n) decreases at leaf temperatures above a relatively mild optimum (T opt) in most higher plants. This decline is often attributed to reduced CO2 conductance, increased CO2 loss from photorespiration and respiration, reduced chloroplast electron transport rate (J), or deactivation of Ribulose-1,5-bisphosphate Carboxylase Oxygenase (Rubisco). However, it is unclear which of these factors can best predict species independent declines in A n at high temperature. We show that independent of species, and on a global scale, the observed decline in A n with rising temperatures can be effectively accounted for by Rubisco deactivation and declines in J. Our finding that A n declines with Rubisco deactivation and J supports a coordinated down-regulation of Rubisco and chloroplast electron transport rates to heat stress. We provide a model that, in the absence of CO2 supply limitations, can predict the response of photosynthesis to short-term increases in leaf temperature. |
| first_indexed | 2024-03-13T10:13:33Z |
| format | Article |
| id | doaj.art-66730f79e3194b608be9a99fed20f09c |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-13T10:13:33Z |
| publishDate | 2023-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-66730f79e3194b608be9a99fed20f09c2023-05-21T11:20:41ZengNature PortfolioNature Communications2041-17232023-05-0114111010.1038/s41467-023-38496-4Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plantsAndrew P. Scafaro0Bradley C. Posch1John R. Evans2Graham D. Farquhar3Owen K. Atkin4Division of Plant Sciences, Research School of Biology, The Australian National UniversityDepartment of Research, Collections and Conservation, Desert Botanical GardenDivision of Plant Sciences, Research School of Biology, The Australian National UniversityDivision of Plant Sciences, Research School of Biology, The Australian National UniversityDivision of Plant Sciences, Research School of Biology, The Australian National UniversityAbstract Net photosynthetic CO2 assimilation rate (A n) decreases at leaf temperatures above a relatively mild optimum (T opt) in most higher plants. This decline is often attributed to reduced CO2 conductance, increased CO2 loss from photorespiration and respiration, reduced chloroplast electron transport rate (J), or deactivation of Ribulose-1,5-bisphosphate Carboxylase Oxygenase (Rubisco). However, it is unclear which of these factors can best predict species independent declines in A n at high temperature. We show that independent of species, and on a global scale, the observed decline in A n with rising temperatures can be effectively accounted for by Rubisco deactivation and declines in J. Our finding that A n declines with Rubisco deactivation and J supports a coordinated down-regulation of Rubisco and chloroplast electron transport rates to heat stress. We provide a model that, in the absence of CO2 supply limitations, can predict the response of photosynthesis to short-term increases in leaf temperature.https://doi.org/10.1038/s41467-023-38496-4 |
| spellingShingle | Andrew P. Scafaro Bradley C. Posch John R. Evans Graham D. Farquhar Owen K. Atkin Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants Nature Communications |
| title | Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants |
| title_full | Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants |
| title_fullStr | Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants |
| title_full_unstemmed | Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants |
| title_short | Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants |
| title_sort | rubisco deactivation and chloroplast electron transport rates co limit photosynthesis above optimal leaf temperature in terrestrial plants |
| url | https://doi.org/10.1038/s41467-023-38496-4 |
| work_keys_str_mv | AT andrewpscafaro rubiscodeactivationandchloroplastelectrontransportratescolimitphotosynthesisaboveoptimalleaftemperatureinterrestrialplants AT bradleycposch rubiscodeactivationandchloroplastelectrontransportratescolimitphotosynthesisaboveoptimalleaftemperatureinterrestrialplants AT johnrevans rubiscodeactivationandchloroplastelectrontransportratescolimitphotosynthesisaboveoptimalleaftemperatureinterrestrialplants AT grahamdfarquhar rubiscodeactivationandchloroplastelectrontransportratescolimitphotosynthesisaboveoptimalleaftemperatureinterrestrialplants AT owenkatkin rubiscodeactivationandchloroplastelectrontransportratescolimitphotosynthesisaboveoptimalleaftemperatureinterrestrialplants |