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Title: Impaired photosynthesis and increased leaf construction costs may induce floral stress during episodes of global warming over macroevolutionary timescales

Abstract

Global warming events have coincided with turnover of plant species at intervals in Earth history. As mean global temperatures rise, the number, frequency and duration of heat-waves will increase. Ginkgo biloba was grown under controlled climatic conditions at two different day/night temperature regimes (25/20 °C and 35/30 °C) to investigate the impact of heat stress. Photosynthetic CO 2-uptake and electron transport were reduced at the higher temperature, while rates of respiration were greater; suggesting that the carbon balance of the leaves was adversely affected. Stomatal conductance and the potential for evaporative cooling of the leaves was reduced at the higher temperature. Furthermore, the capacity of the leaves to dissipate excess energy was also reduced at 35/30 °C, indicating that photo-protective mechanisms were no longer functioning effectively. Leaf economics were adversely affected by heat stress, exhibiting an increase in leaf mass per area and leaf construction costs. This may be consistent with the selective pressures experienced by fossil Ginkgoales during intervals of global warming such as the Triassic - Jurassic boundary or Early Eocene Climatic Optimum. The physiological and morphological responses of the $G$. biloba leaves were closely interrelated; these relationships may be used to infer the leaf economics and photosynthetic/stressmore » physiology of fossil plants.« less

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [4];  [4];  [1]
  1. Italian National Research Council, Bologna (Italy). Tree and Timber Inst. (CNR-IVALSA)
  2. Univ. of Exeter, Devon (England). wildFIRE Lab
  3. Univ. of Florence (Italy). Dept. of Agrifood Production and Environmental Sciences (DiSPAA)
  4. Italian National Research Council, Bologna (Italy). Inst. of Biometeorology (CNR-IBIMET)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1559790
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Haworth, Matthew, Belcher, Claire M., Killi, Dilek, Dewhirst, Rebecca A., Materassi, Alessandro, Raschi, Antonio, and Centritto, Mauro. Impaired photosynthesis and increased leaf construction costs may induce floral stress during episodes of global warming over macroevolutionary timescales. United States: N. p., 2018. Web. doi:10.1038/s41598-018-24459-z.
Haworth, Matthew, Belcher, Claire M., Killi, Dilek, Dewhirst, Rebecca A., Materassi, Alessandro, Raschi, Antonio, & Centritto, Mauro. Impaired photosynthesis and increased leaf construction costs may induce floral stress during episodes of global warming over macroevolutionary timescales. United States. doi:10.1038/s41598-018-24459-z.
Haworth, Matthew, Belcher, Claire M., Killi, Dilek, Dewhirst, Rebecca A., Materassi, Alessandro, Raschi, Antonio, and Centritto, Mauro. Thu . "Impaired photosynthesis and increased leaf construction costs may induce floral stress during episodes of global warming over macroevolutionary timescales". United States. doi:10.1038/s41598-018-24459-z. https://www.osti.gov/servlets/purl/1559790.
@article{osti_1559790,
title = {Impaired photosynthesis and increased leaf construction costs may induce floral stress during episodes of global warming over macroevolutionary timescales},
author = {Haworth, Matthew and Belcher, Claire M. and Killi, Dilek and Dewhirst, Rebecca A. and Materassi, Alessandro and Raschi, Antonio and Centritto, Mauro},
abstractNote = {Global warming events have coincided with turnover of plant species at intervals in Earth history. As mean global temperatures rise, the number, frequency and duration of heat-waves will increase. Ginkgo biloba was grown under controlled climatic conditions at two different day/night temperature regimes (25/20 °C and 35/30 °C) to investigate the impact of heat stress. Photosynthetic CO2-uptake and electron transport were reduced at the higher temperature, while rates of respiration were greater; suggesting that the carbon balance of the leaves was adversely affected. Stomatal conductance and the potential for evaporative cooling of the leaves was reduced at the higher temperature. Furthermore, the capacity of the leaves to dissipate excess energy was also reduced at 35/30 °C, indicating that photo-protective mechanisms were no longer functioning effectively. Leaf economics were adversely affected by heat stress, exhibiting an increase in leaf mass per area and leaf construction costs. This may be consistent with the selective pressures experienced by fossil Ginkgoales during intervals of global warming such as the Triassic - Jurassic boundary or Early Eocene Climatic Optimum. The physiological and morphological responses of the $G$. biloba leaves were closely interrelated; these relationships may be used to infer the leaf economics and photosynthetic/stress physiology of fossil plants.},
doi = {10.1038/s41598-018-24459-z},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {5}
}

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