Increased activity of core photorespiratory enzymes and CO2 transfer conductances are associated with higher and more optimal photosynthetic rates under elevated temperatures in the extremophile Rhazya stricta

Gregory, Luke M.; Roze, Ludmila V.; Walker, Berkley J.

doi:10.1111/pce.14711

Title: Increased activity of core photorespiratory enzymes and CO₂ transfer conductances are associated with higher and more optimal photosynthetic rates under elevated temperatures in the extremophile Rhazya stricta

Journal Article · 04 September 2023 · Plant, Cell and Environment

DOI: https://doi.org/10.1111/pce.14711 · OSTI ID:2229522

Gregory, Luke M. ^[1]; Roze, Ludmila V. ^[2];

^[2]

Michigan State University, East Lansing, MI (United States); Michigan State University
Michigan State University, East Lansing, MI (United States)

Increase photorespiration and optimising intrinsic water use efficiency are unique challenges to photosynthetic carbon fixation at elevated temperatures. To determine how plants can adapt to facilitate high rates of photorespiration at elevated temperatures while also maintaining water-use efficiency, we performed in-depth gas exchange and biochemical assays of the C₃ extremophile, Rhazya stricta. These results demonstrate that R. stricta supports higher rates of photorespiration under elevated temperatures and that these higher rates of photorespiration correlate with increased activity of key photorespiratory enzymes; phosphoglycolate phosphatase and catalase. The increased photorespiratory enzyme activities may increase the overall capacity of photorespiration by reducing enzymatic bottlenecks and allowing minimal inhibitor accumulation under high photorespiratory rates. Additionally, we found the CO₂ transfer conductances (stomatal and mesophyll) are re-allocated to increase the water-use efficiency in R. stricta but not necessarily the photosynthetic response to temperature. These results suggest important adaptive strategies in R. stricta that maintain photosynthetic rates under elevated temperatures with optimal water loss. The strategies found in R. stricta may inform breeding and engineering efforts in other C₃ species to improve photosynthetic efficiency at high temperatures.

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Research Organization:: Michigan State University, East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: FG02-91ER20021

OSTI ID:: 2229522

Journal Information:: Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 12 Vol. 46; ISSN 0140-7791

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
CO2 transfer conductance
Rhazya stricta
catalase
phosphoglycolate phosphatase
photorespiration
water‐use efficiency

Title: Increased activity of core photorespiratory enzymes and CO2 transfer conductances are associated with higher and more optimal photosynthetic rates under elevated temperatures in the extremophile Rhazya stricta

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References (77)

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Title: Increased activity of core photorespiratory enzymes and CO₂ transfer conductances are associated with higher and more optimal photosynthetic rates under elevated temperatures in the extremophile Rhazya stricta