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Acclimation of leaf photosynthesis and respiration to warming in field-grown wheat

Acclimation of leaf photosynthesis and respiration to warming in field-grown wheat

Coast, Onoriode ORCID: 0000-0002-5013-4715, Posch, Bradley C., Bramley, Helen, Gaju, Oorbessy, Richards, Richard A., Lu, Meiqin, Ruan, Yong-Ling, Trethowan, Richard and Atkin, Owen K. (2020) Acclimation of leaf photosynthesis and respiration to warming in field-grown wheat. Plant, Cell & Environment, 44 (7). pp. 2331-2346. ISSN 0140-7791 (Print), 1365-3040 (Online) (doi:https://doi.org/10.1111/pce.13971)

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Abstract

Climate change and future warming will significantly affect crop yield. The capacity of crops to dynamically adjust physiological processes (i.e. acclimate) to warming might improve overall performance. Understanding and quantifying the degree of acclimation in field crops could ensure better parameterization of crop and Earth System models and predictions of crop performance. We hypothesized that for field-grown wheat, when measured at a common temperature (25°C), crops grown under warmer conditions would exhibit acclimation, leading to enhanced crop performance and yield. Acclimation was defined as: (i) decreased rates of net photosynthesis at 25°C (A25) coupled with lower maximum carboxylation capacity (Vcmax25); (ii) reduced leaf dark respiration at 25°C (both in terms of O2 consumption, Rdark_O225; and CO2 efflux, Rdark_CO225); and (iii) lower Rdark_CO225:Vcmax25. Field experiments were conducted over two seasons with 20 wheat genotypes, sown at three different planting dates, to test these hypotheses. Leaf-level CO2 based traits (A25, Rdark_CO225, and Vcmax25) did not show the classic acclimation responses that we hypothesized; by contrast, the hypothesized changes in Rdark_O2 were observed. These findings have implications for predictive crop models that assume similar temperature response among these physiological processes, and for predictions of crop performance in a future warmer world.

Item Type: Article
Uncontrolled Keywords: acclimation, climate change, heat stress, dark respiration, wheat
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Last Modified: 27 Jul 2021 07:56
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None
URI: http://gala.gre.ac.uk/id/eprint/30409

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