French
DeutschSyntrichia caninervis
| Steppe Screw Moss | |
|---|---|
 | |
| Syntrichia caninervis | |
Scientific classification  | |
| Kingdom: | Plantae |
| Division: | Bryophyta |
| Class: | Bryopsida |
| Subclass: | Dicranidae |
| Order: | Pottiales |
| Family: | Pottiaceae |
| Genus: | Syntrichia |
| Species: | S. caninervis |
| Binomial name | |
| Syntrichia caninervis (Mitt.) Broth. | |
| Synonyms | |
| Barbula bornmuelleri (Schiffn.) Paris | |
Syntrichia caninervis, also known as steppe screw moss, is a desert moss species distributed throughout the world. As an extremophile, it is able to withstand desiccation under dry conditions with little access to water and is commonly found in hypolithic communities. It makes use of a novel adaptation to the desert environment to harvest and collect water sources such as dew, fog, snow, and rain, using tiny hairs instead of roots. In laboratory experiments, S. caninervis has shown the ability to survive in a simulated Martian environment.
Description
[edit]The plant was first described by English bryologist William Mitten (1819–1906) to the Linnean Society of London in May 1858, with a description published in their journal in February 1859.[1] It belongs to the Syntrichia genus[2] and the Pottiaceae family.[3][4] It is commonly known as steppe screw moss.[5]
Distribution and habitat
[edit]S. caninervis has a widespread global distribution and is an extremophile[6] commonly found in extreme desert environments[7] and hypolithic communities[2] with the capacity to withstand desiccation under dry conditions.[8] It has been observed growing in China, Mongolia, Siberia, central and southwestern Asia, Europe, and North America.[9] In Tibet, Antarctica, and circumpolar regions, it is part of the biological soil crust, which is a resilient type of ground cover often found in arid lands.[10] In North America, the plant is found throughout the western and northwestern United States and in two western Canadian provinces. In the United States, it is found as far east as New Mexico, Colorado, Wyoming and Montana, all the way through Idaho, Utah, Arizona, and Nevada, and as far west as California, Oregon, and Washington. Two of the most common plant communities in the United States are found in the Mojave Desert and in the Columbia River drainage basin. In Canada, it is found in British Columbia and Alberta.[9]
Extremophile characteristics
[edit]Drought tolerance
[edit]S. caninervis is well-known for its ability to tolerate drought conditions, making it well-adapted to desert environments. Among these adaptions is its tiny hairs on the leaves that allow it to exploit multiple different sources of water, such as dew, fog, snow, and rain.[7] Another example is its ability to photosynthesize once remoistened after desiccation.[11]
Extreme temperature tolerance
[edit]Research has shown that S. caninervis can survive freezing temperatures as low as −196 °C (−320.8 °F) (in liquid nitrogen) for up to 30 days. It has also demonstrated the ability to withstand storage at −80 °C (−112 °F) for up to 5 years. In both cases, the moss was able to regenerate upon thawing, with dehydrated specimens showing faster recovery compared to hydrated ones.[10]
Radiation resistance
[edit]S. caninervis exhibits remarkable tolerance to gamma radiation. It can survive exposure to doses of up to 500 Gy, which is lethal to most plants and far exceeds the lethal dose for humans (around 50 Gy). Some studies have even suggested that exposure to 500 Gy of gamma radiation may promote the plant's growth.[10]
Simulated Martian conditions
[edit]In laboratory experiments, S. caninervis has demonstrated the ability to survive simulated Martian conditions. These conditions included an atmosphere composed of 95% CO₂, temperature fluctuations between −60 and 20 °C (−76 and 68 °F), high levels of UV radiation, and low atmospheric pressure. Dried moss plants achieved a 100% regeneration rate within 30 days after being subjected to these conditions for up to 7 days.[10]
Varieties
[edit]The Global Biodiversity Information Facility lists the following five varieties for Syntrichia caninervis:[12]
- Syntrichia caninervis var. abranchesii (Luisier) R.H.zander
- Syntrichia caninervis var. astrakhanica Ignatov, Ignatova - Suragina
- Syntrichia caninervis var. caninervis Mitt.
- Syntrichia caninervis var. gypsophila (J.J.Amann ex G.Roth) Ochyra
- Syntrichia caninervis var. pseudodesertorum (Vondr.) M.T.Gallego
References
[edit]- ^ Mitten, William (February 21, 1859) [https://www.biodiversitylibrary.org/page/167668 "Musci Indiae Orientalis, an enumeration of the mosses of the East Indies". Journal of the Proceedings of the Linnean Society, Bot., Suppl. 1: 39. Retrieved July 7, 2024.
- ^ a b Dabravolski, S.A; Isayenkov, S.V. (2022). "Metabolites Facilitating Adaptation of Desert Cyanobacteria to Extremely Arid Environments". Plants. 11 (23): 3225. doi:10.3390/plants11233225. PMC 9736550. PMID 36501264.
- ^ Canadian Journal of Botany: Journal Canadien de Botanique. National Research Council of Canada. 2002.
- ^ Ochyra, Ryszard; Bednarek-Ochyra, Halina; Smith, Ronald Ian Lewis (2008-11-13). Illustrated Moss Flora of Antarctica. Cambridge University Press. ISBN 978-0-521-81402-7.
- ^ Gurera, Dev; Bhushan, Bharat (2020-03-20). "Passive water harvesting by desert plants and animals: lessons from nature". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 378 (2167): 20190444. Bibcode:2020RSPTA.37890444G. doi:10.1098/rsta.2019.0444. ISSN 1364-503X. PMID 32008451. Archived from the original on 2023-01-31. Retrieved 2024-07-02.
- ^ Silva, A.T.; Gao, B.; Fisher, K.M.; et al. (March 2021). "To dry perchance to live: Insights from the genome of the desiccation-tolerant biocrust moss Syntrichia caninervis". The Plant Journal. 105 (5): 1339–1356. doi:10.1111/tpj.15116. PMID 33277766. Archived from the original on 2024-01-14. Retrieved 2024-07-07.
- ^ a b Pan, Zhao; Pitt, William G.; Zhang, Yuanming; Wu, Nan; Tao, Ye; Truscott, Tadd T. (2016-06-06). "The upside-down water collection system of Syntrichia caninervis". Nature Plants. 2 (7): 16076. doi:10.1038/nplants.2016.76. ISSN 2055-0278. PMID 27302768. Archived from the original on 2024-06-04. Retrieved 2024-07-07.
- ^ Pan, Zhao; Pitt, William G.; Zhang, Yuanming; Wu, Nan; Tao, Ye; Truscott, Tadd T. (2016-06-06). "The upside-down water collection system of Syntrichia caninervis". Nature Plants. 2 (7): 16076. doi:10.1038/nplants.2016.76. ISSN 2055-0278. PMID 27302768.
- ^ a b "Syntrichia caninervis". Flora of North America. 2007. pp. 619, 625, 626. Archived from the original on 2024-04-19. Retrieved 2024-07-08. See distribution map Archived 2024-04-19 at the Wayback Machine.
- ^ a b c d Li, X.; Bai, W.; Yang, Q.; et al. (2024). "The extremotolerant desert moss Syntrichia caninervis is a promising pioneer plant for colonizing extraterrestrial environments". The Innovation. 5 (4): 1–9. doi:10.1016/j.xinn.2024.100657. PMC 11282406. Archived from the original on 2024-07-08. Retrieved 2024-07-07.
- Davis, Nicola (30 June 2024). "Scientists find desert moss 'that can survive on Mars'". The Guardian. Archived from the original on 2024-07-08. Retrieved 2024-07-07.
- ^ Zhang, J.; Zhang, Y. M.; Downing, A.; Wu, N.; Zhang, B. C. (2011-03-01). "Photosynthetic and cytological recovery on remoistening Syntrichia caninervis Mitt., a desiccation-tolerant moss from Northwestern China". Photosynthetica. 49 (1): 13–20. doi:10.1007/s11099-011-0002-6.
- ^ "Syntrichia caninervis Mitt." Archived 2024-04-19 at the Wayback Machine. Global Biodiversity Information Facility. Retrieved July 7, 2024.