Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited
The search for a universal explanation of the altitudinal limit determined by the alpine treeline has given rise to different hypotheses. In this study, we revisited Michaelis’ hypothesis which proposed that an inadequate “ripening” of the cuticle caused a greater transpiration rate during winter in...
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Online Access: | http://dx.doi.org/10.3389/fpls.2021.786933 https://www.frontiersin.org/articles/10.3389/fpls.2021.786933/full |
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crfrontiers:10.3389/fpls.2021.786933 2024-02-11T10:09:15+01:00 Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited Bueno, Amauri Alonso-Forn, David Peguero-Pina, José Javier de Souza, Aline Xavier Ferrio, Juan Pedro Sancho-Knapik, Domingo Gil-Pelegrín, Eustaquio 2022 http://dx.doi.org/10.3389/fpls.2021.786933 https://www.frontiersin.org/articles/10.3389/fpls.2021.786933/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Plant Science volume 12 ISSN 1664-462X Plant Science journal-article 2022 crfrontiers https://doi.org/10.3389/fpls.2021.786933 2024-01-26T10:05:55Z The search for a universal explanation of the altitudinal limit determined by the alpine treeline has given rise to different hypotheses. In this study, we revisited Michaelis’ hypothesis which proposed that an inadequate “ripening” of the cuticle caused a greater transpiration rate during winter in the treeline. However, few studies with different explanations have investigated the role of passive mechanisms of needles for protecting against water loss during winter in conifers at the treeline. To shed light on this, the cuticular transpiration barrier was studied in the transition from subalpine Pinus uncinata forests to alpine tundra at the upper limit of the species in the Pyrenees. This upper limit of P. uncinata was selected here as an example of the ecotones formed by conifers in the temperate mountains of the northern hemisphere. Our study showed that minimum leaf conductance in needles from upper limit specimens was higher than those measured in specimens living in the lower levels of the sub-alpine forest and also displayed lower cuticle thickness values, which should reinforce the seminal hypothesis by Michaelis. Our study showed clear evidence that supports the inadequate development of needle cuticles as one of the factors that lead to increased transpirational water losses during winter and, consequently, a higher risk of suffering frost drought. Article in Journal/Newspaper Tundra Frontiers (Publisher) Frontiers in Plant Science 12 |
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Frontiers (Publisher) |
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Plant Science |
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Plant Science Bueno, Amauri Alonso-Forn, David Peguero-Pina, José Javier de Souza, Aline Xavier Ferrio, Juan Pedro Sancho-Knapik, Domingo Gil-Pelegrín, Eustaquio Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited |
topic_facet |
Plant Science |
description |
The search for a universal explanation of the altitudinal limit determined by the alpine treeline has given rise to different hypotheses. In this study, we revisited Michaelis’ hypothesis which proposed that an inadequate “ripening” of the cuticle caused a greater transpiration rate during winter in the treeline. However, few studies with different explanations have investigated the role of passive mechanisms of needles for protecting against water loss during winter in conifers at the treeline. To shed light on this, the cuticular transpiration barrier was studied in the transition from subalpine Pinus uncinata forests to alpine tundra at the upper limit of the species in the Pyrenees. This upper limit of P. uncinata was selected here as an example of the ecotones formed by conifers in the temperate mountains of the northern hemisphere. Our study showed that minimum leaf conductance in needles from upper limit specimens was higher than those measured in specimens living in the lower levels of the sub-alpine forest and also displayed lower cuticle thickness values, which should reinforce the seminal hypothesis by Michaelis. Our study showed clear evidence that supports the inadequate development of needle cuticles as one of the factors that lead to increased transpirational water losses during winter and, consequently, a higher risk of suffering frost drought. |
format |
Article in Journal/Newspaper |
author |
Bueno, Amauri Alonso-Forn, David Peguero-Pina, José Javier de Souza, Aline Xavier Ferrio, Juan Pedro Sancho-Knapik, Domingo Gil-Pelegrín, Eustaquio |
author_facet |
Bueno, Amauri Alonso-Forn, David Peguero-Pina, José Javier de Souza, Aline Xavier Ferrio, Juan Pedro Sancho-Knapik, Domingo Gil-Pelegrín, Eustaquio |
author_sort |
Bueno, Amauri |
title |
Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited |
title_short |
Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited |
title_full |
Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited |
title_fullStr |
Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited |
title_full_unstemmed |
Minimum Leaf Conductance (gmin) Is Higher in the Treeline of Pinus uncinata Ram. in the Pyrenees: Michaelis’ Hypothesis Revisited |
title_sort |
minimum leaf conductance (gmin) is higher in the treeline of pinus uncinata ram. in the pyrenees: michaelis’ hypothesis revisited |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/fpls.2021.786933 https://www.frontiersin.org/articles/10.3389/fpls.2021.786933/full |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Frontiers in Plant Science volume 12 ISSN 1664-462X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fpls.2021.786933 |
container_title |
Frontiers in Plant Science |
container_volume |
12 |
_version_ |
1790609031449018368 |