Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species
Ranunculus glacialis grows and reproduces successfully, although the snow-free time period is short (2–3 months) and night frosts are frequent. At a nival site (3185 m a.s.l.), we disentangled the interplay between the atmospheric temperature, leaf temperatures, and leaf freezing frequency to assess...
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ftdoajarticles:oai:doaj.org/article:ab67225f94954b6c9a32f81c514ebdce 2023-05-15T18:04:31+02:00 Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species Matthias Stegner Barbara Lackner Tanja Schäfernolte Othmar Buchner Nannan Xiao Notburga Gierlinger Andreas Holzinger Gilbert Neuner 2020-09-01T00:00:00Z https://doi.org/10.3390/ijms21197042 https://doaj.org/article/ab67225f94954b6c9a32f81c514ebdce EN eng MDPI AG https://www.mdpi.com/1422-0067/21/19/7042 https://doaj.org/toc/1661-6596 https://doaj.org/toc/1422-0067 doi:10.3390/ijms21197042 1422-0067 1661-6596 https://doaj.org/article/ab67225f94954b6c9a32f81c514ebdce International Journal of Molecular Sciences, Vol 21, Iss 7042, p 7042 (2020) alpine plants cold hardiness freeze dehydration ice nucleation ice management low temperature Biology (General) QH301-705.5 Chemistry QD1-999 article 2020 ftdoajarticles https://doi.org/10.3390/ijms21197042 2022-12-31T15:55:26Z Ranunculus glacialis grows and reproduces successfully, although the snow-free time period is short (2–3 months) and night frosts are frequent. At a nival site (3185 m a.s.l.), we disentangled the interplay between the atmospheric temperature, leaf temperatures, and leaf freezing frequency to assess the actual strain. For a comprehensive understanding, the freezing behavior from the whole plant to the leaf and cellular level and its physiological after-effects as well as cell wall chemistry were studied. The atmospheric temperatures did not mirror the leaf temperatures, which could be 9.3 °C lower. Leaf freezing occurred even when the air temperature was above 0 °C. Ice nucleation at on average −2.6 °C started usually independently in each leaf, as the shoot is deep-seated in unfrozen soil. All the mesophyll cells were subjected to freezing cytorrhysis. Huge ice masses formed in the intercellular spaces of the spongy parenchyma. After thawing, photosynthesis was unaffected regardless of whether ice had formed. The cell walls were pectin-rich and triglycerides occurred, particularly in the spongy parenchyma. At high elevations, atmospheric temperatures fail to predict plant freezing. Shoot burial prevents ice spreading, specific tissue architecture enables ice management, and the flexibility of cell walls allows recurrent freezing cytorrhysis. The peculiar patterning of triglycerides close to ice rewards further investigation. Article in Journal/Newspaper Ranunculus glacialis Directory of Open Access Journals: DOAJ Articles International Journal of Molecular Sciences 21 19 7042 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
alpine plants cold hardiness freeze dehydration ice nucleation ice management low temperature Biology (General) QH301-705.5 Chemistry QD1-999 |
spellingShingle |
alpine plants cold hardiness freeze dehydration ice nucleation ice management low temperature Biology (General) QH301-705.5 Chemistry QD1-999 Matthias Stegner Barbara Lackner Tanja Schäfernolte Othmar Buchner Nannan Xiao Notburga Gierlinger Andreas Holzinger Gilbert Neuner Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species |
topic_facet |
alpine plants cold hardiness freeze dehydration ice nucleation ice management low temperature Biology (General) QH301-705.5 Chemistry QD1-999 |
description |
Ranunculus glacialis grows and reproduces successfully, although the snow-free time period is short (2–3 months) and night frosts are frequent. At a nival site (3185 m a.s.l.), we disentangled the interplay between the atmospheric temperature, leaf temperatures, and leaf freezing frequency to assess the actual strain. For a comprehensive understanding, the freezing behavior from the whole plant to the leaf and cellular level and its physiological after-effects as well as cell wall chemistry were studied. The atmospheric temperatures did not mirror the leaf temperatures, which could be 9.3 °C lower. Leaf freezing occurred even when the air temperature was above 0 °C. Ice nucleation at on average −2.6 °C started usually independently in each leaf, as the shoot is deep-seated in unfrozen soil. All the mesophyll cells were subjected to freezing cytorrhysis. Huge ice masses formed in the intercellular spaces of the spongy parenchyma. After thawing, photosynthesis was unaffected regardless of whether ice had formed. The cell walls were pectin-rich and triglycerides occurred, particularly in the spongy parenchyma. At high elevations, atmospheric temperatures fail to predict plant freezing. Shoot burial prevents ice spreading, specific tissue architecture enables ice management, and the flexibility of cell walls allows recurrent freezing cytorrhysis. The peculiar patterning of triglycerides close to ice rewards further investigation. |
format |
Article in Journal/Newspaper |
author |
Matthias Stegner Barbara Lackner Tanja Schäfernolte Othmar Buchner Nannan Xiao Notburga Gierlinger Andreas Holzinger Gilbert Neuner |
author_facet |
Matthias Stegner Barbara Lackner Tanja Schäfernolte Othmar Buchner Nannan Xiao Notburga Gierlinger Andreas Holzinger Gilbert Neuner |
author_sort |
Matthias Stegner |
title |
Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species |
title_short |
Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species |
title_full |
Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species |
title_fullStr |
Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species |
title_full_unstemmed |
Winter Nights during Summer Time: Stress Physiological Response to Ice and the Facilitation of Freezing Cytorrhysis by Elastic Cell Wall Components in the Leaves of a Nival Species |
title_sort |
winter nights during summer time: stress physiological response to ice and the facilitation of freezing cytorrhysis by elastic cell wall components in the leaves of a nival species |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/ijms21197042 https://doaj.org/article/ab67225f94954b6c9a32f81c514ebdce |
genre |
Ranunculus glacialis |
genre_facet |
Ranunculus glacialis |
op_source |
International Journal of Molecular Sciences, Vol 21, Iss 7042, p 7042 (2020) |
op_relation |
https://www.mdpi.com/1422-0067/21/19/7042 https://doaj.org/toc/1661-6596 https://doaj.org/toc/1422-0067 doi:10.3390/ijms21197042 1422-0067 1661-6596 https://doaj.org/article/ab67225f94954b6c9a32f81c514ebdce |
op_doi |
https://doi.org/10.3390/ijms21197042 |
container_title |
International Journal of Molecular Sciences |
container_volume |
21 |
container_issue |
19 |
container_start_page |
7042 |
_version_ |
1766175918117617664 |