On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary
The Triassic-Jurassic boundary (TJB) coincides with major disruption to the carbon cycle and global warming as the Central Atlantic Magmatic Province developed. This resulted in both marine and terrestrial extinctions, with terrestrial plants thought to experience thermal stress as global temperatur...
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fttubitakaj:oai:journals.tubitak.gov.tr:earth-1307 2023-05-15T16:03:54+02:00 On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary HAWORTH, MATTHEW GALLAGHER, ANGELA SUM, ELYSIA HILL-DONNELLY, MARLENE STEINTHORSDOTTIR, MARGRET MCELWAIN, JENNIFER 2014-01-01T08:00:00Z application/pdf https://journals.tubitak.gov.tr/earth/vol23/iss3/6 https://journals.tubitak.gov.tr/cgi/viewcontent.cgi?article=1307&context=earth unknown TÜBİTAK Academic Journals https://journals.tubitak.gov.tr/earth/vol23/iss3/6 https://journals.tubitak.gov.tr/cgi/viewcontent.cgi?article=1307&context=earth Turkish Journal of Earth Sciences Triassic-Jurassic boundary ginkgo plant stress thermal stress paleophysiology nonphotochemical quenching Earth Sciences text 2014 fttubitakaj 2022-10-19T17:24:01Z The Triassic-Jurassic boundary (TJB) coincides with major disruption to the carbon cycle and global warming as the Central Atlantic Magmatic Province developed. This resulted in both marine and terrestrial extinctions, with terrestrial plants thought to experience thermal stress as global temperatures and atmospheric CO_2 levels rose. As plant compression fossils typically only preserve external morphological features, it has not been possible to reconstruct plant paleophysiology in order to elucidate the mechanisms underlying plant stress and extinction. Here we present a new approach allowing us to infer the photosynthetic performance and stress physiology of fossil plants, applied to fossil Ginkgoales across the TJB. We use correlations between the adaxial epidermal cell density of extant Ginkgo biloba and photosynthetic and protective stress physiology to infer the paleophysiological condition of Late Triassic-Early Jurassic-aged plants from Astartekløft, East Greenland. The density of fossil leaf adaxial epidermal cells indicates that photosynthetic performance of Ginkgoales became increasingly impaired towards the latter stages of the Triassic, before improving into the Early Jurassic. This is consistent with \delta^{13}C isotope values, paleo-[CO_2] levels, and global mean temperatures, suggesting that photosynthetic performance was influenced by the prevailing environmental conditions during the TJB event. Dissipation of absorbed energy as heat would also have risen towards the boundary as plant stress increased, in order to protect the photosynthetic physiology. The increase in dissipation of energy as heat, associated with a reduction in convective heat loss due to reduced transpiration rates, would have exacerbated plant thermal stress at the TJB, thus contributing to sudden biodiversity loss and ecological change. Text East Greenland Greenland TÜBİTAK Academic Journals Greenland |
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fttubitakaj |
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topic |
Triassic-Jurassic boundary ginkgo plant stress thermal stress paleophysiology nonphotochemical quenching Earth Sciences |
spellingShingle |
Triassic-Jurassic boundary ginkgo plant stress thermal stress paleophysiology nonphotochemical quenching Earth Sciences HAWORTH, MATTHEW GALLAGHER, ANGELA SUM, ELYSIA HILL-DONNELLY, MARLENE STEINTHORSDOTTIR, MARGRET MCELWAIN, JENNIFER On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary |
topic_facet |
Triassic-Jurassic boundary ginkgo plant stress thermal stress paleophysiology nonphotochemical quenching Earth Sciences |
description |
The Triassic-Jurassic boundary (TJB) coincides with major disruption to the carbon cycle and global warming as the Central Atlantic Magmatic Province developed. This resulted in both marine and terrestrial extinctions, with terrestrial plants thought to experience thermal stress as global temperatures and atmospheric CO_2 levels rose. As plant compression fossils typically only preserve external morphological features, it has not been possible to reconstruct plant paleophysiology in order to elucidate the mechanisms underlying plant stress and extinction. Here we present a new approach allowing us to infer the photosynthetic performance and stress physiology of fossil plants, applied to fossil Ginkgoales across the TJB. We use correlations between the adaxial epidermal cell density of extant Ginkgo biloba and photosynthetic and protective stress physiology to infer the paleophysiological condition of Late Triassic-Early Jurassic-aged plants from Astartekløft, East Greenland. The density of fossil leaf adaxial epidermal cells indicates that photosynthetic performance of Ginkgoales became increasingly impaired towards the latter stages of the Triassic, before improving into the Early Jurassic. This is consistent with \delta^{13}C isotope values, paleo-[CO_2] levels, and global mean temperatures, suggesting that photosynthetic performance was influenced by the prevailing environmental conditions during the TJB event. Dissipation of absorbed energy as heat would also have risen towards the boundary as plant stress increased, in order to protect the photosynthetic physiology. The increase in dissipation of energy as heat, associated with a reduction in convective heat loss due to reduced transpiration rates, would have exacerbated plant thermal stress at the TJB, thus contributing to sudden biodiversity loss and ecological change. |
format |
Text |
author |
HAWORTH, MATTHEW GALLAGHER, ANGELA SUM, ELYSIA HILL-DONNELLY, MARLENE STEINTHORSDOTTIR, MARGRET MCELWAIN, JENNIFER |
author_facet |
HAWORTH, MATTHEW GALLAGHER, ANGELA SUM, ELYSIA HILL-DONNELLY, MARLENE STEINTHORSDOTTIR, MARGRET MCELWAIN, JENNIFER |
author_sort |
HAWORTH, MATTHEW |
title |
On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary |
title_short |
On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary |
title_full |
On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary |
title_fullStr |
On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary |
title_full_unstemmed |
On the reconstruction of plant photosynthetic and stress physiology across the Triassic-Jurassic boundary |
title_sort |
on the reconstruction of plant photosynthetic and stress physiology across the triassic-jurassic boundary |
publisher |
TÜBİTAK Academic Journals |
publishDate |
2014 |
url |
https://journals.tubitak.gov.tr/earth/vol23/iss3/6 https://journals.tubitak.gov.tr/cgi/viewcontent.cgi?article=1307&context=earth |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Turkish Journal of Earth Sciences |
op_relation |
https://journals.tubitak.gov.tr/earth/vol23/iss3/6 https://journals.tubitak.gov.tr/cgi/viewcontent.cgi?article=1307&context=earth |
_version_ |
1766399588903682048 |